Merge "Remove try/catch blocks with assertj - apex-pdp"

20 files changed, 356 insertions, 690 deletions

diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxConceptGetterImplTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxConceptGetterImplTest.java
index 37d3a9dd5..44a9de49e 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxConceptGetterImplTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxConceptGetterImplTest.java
@@ -1,29 +1,30 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.model.basicmodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
-import static org.junit.Assert.fail;
 
 import java.util.NavigableMap;
 import java.util.TreeMap;
@@ -41,17 +42,12 @@ public class AxConceptGetterImplTest {
 
         AxConceptGetterImpl<AxArtifactKey> getter = new AxConceptGetterImpl<>(keyMap);
         assertNotNull(getter);
-        
+
         AxArtifactKey keyA = new AxArtifactKey("A", "0.0.1");
         assertNull(getter.get(keyA));
-        
-        try {
-            getter.get((String) null);
-            fail("test should throw an exception here");
-        } catch (Exception getException) {
-            assertEquals("conceptKeyName may not be null", getException.getMessage());
-        }
 
+        assertThatThrownBy(() -> getter.get((String) null))
+            .hasMessage("conceptKeyName may not be null");
         assertNull(getter.get("W"));
 
         AxArtifactKey keyZ = new AxArtifactKey("Z", "0.0.1");
@@ -69,19 +65,14 @@ public class AxConceptGetterImplTest {
         keyMap.remove(keyZ);
         assertEquals(keyW002, getter.get("W"));
 
-        try {
-            getter.get((String) null, "0.0.1");
-            fail("test should throw an exception here");
-        } catch (Exception getException) {
-            assertEquals("conceptKeyName may not be null", getException.getMessage());
-        }
-
+        assertThatThrownBy(() -> getter.get((String) null, "0.0.1"))
+            .hasMessage("conceptKeyName may not be null");
         assertEquals(keyW002, getter.get("W", "0.0.2"));
         assertEquals(keyW002, getter.get("W", (String) null));
-        
+
         assertEquals(new TreeSet<AxArtifactKey>(keyMap.values()), getter.getAll(null));
         assertEquals(new TreeSet<AxArtifactKey>(keyMap.values()), getter.getAll(null, null));
-        
+
         assertEquals(keyW001, getter.getAll("W", null).iterator().next());
         assertEquals(keyW002, getter.getAll("W", "0.0.2").iterator().next());
         assertEquals(0, getter.getAll("A", null).size());
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxKeyTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxKeyTest.java
index ff12fc5e8..fbbc4a793 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxKeyTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxKeyTest.java
@@ -21,12 +21,12 @@
 
 package org.onap.policy.apex.model.basicmodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.lang.reflect.Field;
 import org.junit.Test;
@@ -36,15 +36,9 @@ public class AxKeyTest {
 
     @Test
     public void testArtifactKey() {
-        try {
-            new AxArtifactKey("some bad key id");
-            fail("This test should throw an exception");
-        } catch (IllegalArgumentException e) {
-            assertEquals("parameter \"id\": value \"some bad key id\", "
-                            + "does not match regular expression \"[A-Za-z0-9\\-_\\.]+:[0-9].[0-9].[0-9]\"",
-                            e.getMessage());
-        }
-
+        assertThatThrownBy(() -> new AxArtifactKey("some bad key id"))
+            .hasMessage("parameter \"id\": value \"some bad key id\", "
+                            + "does not match regular expression \"[A-Za-z0-9\\-_\\.]+:[0-9].[0-9].[0-9]\"");
         AxArtifactKey someKey0 = new AxArtifactKey();
         assertEquals(AxArtifactKey.getNullKey(), someKey0);
 
@@ -109,12 +103,8 @@ public class AxKeyTest {
         assertEquals(0, someKey7.compareTo(someKey1));
         assertEquals(-12, someKey7.compareTo(someKey0));
 
-        try {
-            someKey0.compareTo(null);
-        } catch (IllegalArgumentException e) {
-            assertEquals("comparison object may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> someKey0.compareTo(null))
+            .hasMessage("comparison object may not be null");
         assertEquals(0, someKey0.compareTo(someKey0));
         assertEquals(353602977, someKey0.compareTo(new AxReferenceKey()));
 
@@ -135,40 +125,33 @@ public class AxKeyTest {
 
 
     @Test
-    public void testValidation() {
+    public void testValidation() throws IllegalArgumentException, IllegalAccessException,
+        NoSuchFieldException, SecurityException {
         AxArtifactKey testKey = new AxArtifactKey("TheKey", "0.0.1");
         assertEquals("TheKey:0.0.1", testKey.getId());
 
-        try {
-            Field nameField = testKey.getClass().getDeclaredField("name");
-            nameField.setAccessible(true);
-            nameField.set(testKey, "Key Name");
-            AxValidationResult validationResult = new AxValidationResult();
-            testKey.validate(validationResult);
-            nameField.set(testKey, "TheKey");
-            nameField.setAccessible(false);
-            assertEquals(
-                "name invalid-parameter name with value Key Name "
-                    + "does not match regular expression [A-Za-z0-9\\-_\\.]+",
-                validationResult.getMessageList().get(0).getMessage());
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            Field versionField = testKey.getClass().getDeclaredField("version");
-            versionField.setAccessible(true);
-            versionField.set(testKey, "Key Version");
-            AxValidationResult validationResult = new AxValidationResult();
-            testKey.validate(validationResult);
-            versionField.set(testKey, "0.0.1");
-            versionField.setAccessible(false);
-            assertEquals(
-                "version invalid-parameter version with value Key Version "
-                    + "does not match regular expression [A-Za-z0-9.]+",
-                validationResult.getMessageList().get(0).getMessage());
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
+        Field nameField = testKey.getClass().getDeclaredField("name");
+        nameField.setAccessible(true);
+        nameField.set(testKey, "Key Name");
+        AxValidationResult validationResult = new AxValidationResult();
+        testKey.validate(validationResult);
+        nameField.set(testKey, "TheKey");
+        nameField.setAccessible(false);
+        assertEquals(
+            "name invalid-parameter name with value Key Name "
+                + "does not match regular expression [A-Za-z0-9\\-_\\.]+",
+            validationResult.getMessageList().get(0).getMessage());
+
+        Field versionField = testKey.getClass().getDeclaredField("version");
+        versionField.setAccessible(true);
+        versionField.set(testKey, "Key Version");
+        AxValidationResult validationResultV = new AxValidationResult();
+        testKey.validate(validationResultV);
+        versionField.set(testKey, "0.0.1");
+        versionField.setAccessible(false);
+        assertEquals(
+            "version invalid-parameter version with value Key Version "
+                + "does not match regular expression [A-Za-z0-9.]+",
+            validationResultV.getMessageList().get(0).getMessage());
     }
 }
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxReferenceKeyTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxReferenceKeyTest.java
index cca0b61ae..49a14dd3c 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxReferenceKeyTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/concepts/AxReferenceKeyTest.java
@@ -21,12 +21,12 @@
 
 package org.onap.policy.apex.model.basicmodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.lang.reflect.Field;
 import org.junit.Test;
@@ -107,100 +107,71 @@ public class AxReferenceKeyTest {
 
         assertNotNull(testReferenceKey.getKeys());
 
-        try {
-            testReferenceKey.equals(null);
-            fail("test should throw an exception here");
-        } catch (Exception iae) {
-            assertEquals("comparison object may not be null", iae.getMessage());
-        }
-
-        try {
-            testReferenceKey.copyTo(null);
-            fail("test should throw an exception here");
-        } catch (Exception iae) {
-            assertEquals("target may not be null", iae.getMessage());
-        }
-
-        try {
-            testReferenceKey.copyTo(new AxArtifactKey("Key", "0.0.1"));
-            fail("test should throw an exception here");
-        } catch (Exception iae) {
-            assertEquals("org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey is not an instance of "
-                + "org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey", iae.getMessage());
-        }
-
+        assertThatThrownBy(() -> testReferenceKey.equals(null))
+            .hasMessage("comparison object may not be null");
+        assertThatThrownBy(() -> testReferenceKey.copyTo(null))
+            .hasMessage("target may not be null");
+        assertThatThrownBy(() -> testReferenceKey.copyTo(new AxArtifactKey("Key", "0.0.1")))
+            .hasMessage("org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey is not an instance of "
+                + "org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey");
         AxReferenceKey targetRefKey = new AxReferenceKey();
         assertEquals(testReferenceKey, testReferenceKey.copyTo(targetRefKey));
     }
 
     @Test
-    public void testValidation() {
+    public void testValidation() throws IllegalArgumentException, IllegalAccessException,
+        NoSuchFieldException, SecurityException {
         AxReferenceKey testReferenceKey = new AxReferenceKey();
         testReferenceKey.setParentArtifactKey(new AxArtifactKey("PN", "0.0.1"));
         assertEquals("PN:0.0.1", testReferenceKey.getParentArtifactKey().getId());
 
-        try {
-            Field parentNameField = testReferenceKey.getClass().getDeclaredField("parentKeyName");
-            parentNameField.setAccessible(true);
-            parentNameField.set(testReferenceKey, "Parent Name");
-            AxValidationResult validationResult = new AxValidationResult();
-            testReferenceKey.validate(validationResult);
-            parentNameField.set(testReferenceKey, "ParentName");
-            parentNameField.setAccessible(false);
-            assertEquals(
-                "parentKeyName invalid-parameter parentKeyName with value Parent Name "
-                    + "does not match regular expression [A-Za-z0-9\\-_\\.]+",
-                validationResult.getMessageList().get(0).getMessage());
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            Field parentVersionField = testReferenceKey.getClass().getDeclaredField("parentKeyVersion");
-            parentVersionField.setAccessible(true);
-            parentVersionField.set(testReferenceKey, "Parent Version");
-            AxValidationResult validationResult = new AxValidationResult();
-            testReferenceKey.validate(validationResult);
-            parentVersionField.set(testReferenceKey, "0.0.1");
-            parentVersionField.setAccessible(false);
-            assertEquals(
-                "parentKeyVersion invalid-parameter parentKeyVersion with value Parent Version "
-                    + "does not match regular expression [A-Za-z0-9.]+",
-                validationResult.getMessageList().get(0).getMessage());
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            Field parentLocalNameField = testReferenceKey.getClass().getDeclaredField("parentLocalName");
-            parentLocalNameField.setAccessible(true);
-            parentLocalNameField.set(testReferenceKey, "Parent Local Name");
-            AxValidationResult validationResult = new AxValidationResult();
-            testReferenceKey.validate(validationResult);
-            parentLocalNameField.set(testReferenceKey, "ParentLocalName");
-            parentLocalNameField.setAccessible(false);
-            assertEquals(
-                "parentLocalName invalid-parameter parentLocalName with value "
-                    + "Parent Local Name does not match regular expression [A-Za-z0-9\\-_\\.]+|^$",
-                validationResult.getMessageList().get(0).getMessage());
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            Field localNameField = testReferenceKey.getClass().getDeclaredField("localName");
-            localNameField.setAccessible(true);
-            localNameField.set(testReferenceKey, "Local Name");
-            AxValidationResult validationResult = new AxValidationResult();
-            testReferenceKey.validate(validationResult);
-            localNameField.set(testReferenceKey, "LocalName");
-            localNameField.setAccessible(false);
-            assertEquals(
-                "localName invalid-parameter localName with value Local Name "
-                    + "does not match regular expression [A-Za-z0-9\\-_\\.]+|^$",
-                validationResult.getMessageList().get(0).getMessage());
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
+        Field parentNameField = testReferenceKey.getClass().getDeclaredField("parentKeyName");
+        parentNameField.setAccessible(true);
+        parentNameField.set(testReferenceKey, "Parent Name");
+        AxValidationResult validationResult = new AxValidationResult();
+        testReferenceKey.validate(validationResult);
+        parentNameField.set(testReferenceKey, "ParentName");
+        parentNameField.setAccessible(false);
+        assertEquals(
+            "parentKeyName invalid-parameter parentKeyName with value Parent Name "
+                + "does not match regular expression [A-Za-z0-9\\-_\\.]+",
+            validationResult.getMessageList().get(0).getMessage());
+
+        Field parentVersionField = testReferenceKey.getClass().getDeclaredField("parentKeyVersion");
+        parentVersionField.setAccessible(true);
+        parentVersionField.set(testReferenceKey, "Parent Version");
+        AxValidationResult validationResultPV = new AxValidationResult();
+        testReferenceKey.validate(validationResultPV);
+        parentVersionField.set(testReferenceKey, "0.0.1");
+        parentVersionField.setAccessible(false);
+        assertEquals(
+            "parentKeyVersion invalid-parameter parentKeyVersion with value Parent Version "
+                + "does not match regular expression [A-Za-z0-9.]+",
+            validationResultPV.getMessageList().get(0).getMessage());
+
+        Field parentLocalNameField = testReferenceKey.getClass().getDeclaredField("parentLocalName");
+        parentLocalNameField.setAccessible(true);
+        parentLocalNameField.set(testReferenceKey, "Parent Local Name");
+        AxValidationResult validationResultPL = new AxValidationResult();
+        testReferenceKey.validate(validationResultPL);
+        parentLocalNameField.set(testReferenceKey, "ParentLocalName");
+        parentLocalNameField.setAccessible(false);
+        assertEquals(
+            "parentLocalName invalid-parameter parentLocalName with value "
+                + "Parent Local Name does not match regular expression [A-Za-z0-9\\-_\\.]+|^$",
+            validationResultPL.getMessageList().get(0).getMessage());
+
+        Field localNameField = testReferenceKey.getClass().getDeclaredField("localName");
+        localNameField.setAccessible(true);
+        localNameField.set(testReferenceKey, "Local Name");
+        AxValidationResult validationResultLN = new AxValidationResult();
+        testReferenceKey.validate(validationResultLN);
+        localNameField.set(testReferenceKey, "LocalName");
+        localNameField.setAccessible(false);
+        assertEquals(
+            "localName invalid-parameter localName with value Local Name "
+                + "does not match regular expression [A-Za-z0-9\\-_\\.]+|^$",
+            validationResultLN.getMessageList().get(0).getMessage());
+
     }
 }
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/DaoMiscTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/DaoMiscTest.java
index 2b4cd5c30..6f9bef83d 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/DaoMiscTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/DaoMiscTest.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,9 +21,9 @@
 
 package org.onap.policy.apex.model.basicmodel.dao;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
-import static org.junit.Assert.fail;
 
 import java.util.Properties;
 import org.junit.Test;
@@ -47,21 +48,12 @@ public class DaoMiscTest {
         final DaoParameters daoParameters = new DaoParameters();
 
         daoParameters.setPluginClass("somewhere.over.the.rainbow");
-        try {
-            new ApexDaoFactory().createApexDao(daoParameters);
-            fail("test shold throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("Apex DAO class not found for DAO plugin \"somewhere.over.the.rainbow\"", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> new ApexDaoFactory().createApexDao(daoParameters))
+            .hasMessage("Apex DAO class not found for DAO plugin \"somewhere.over.the.rainbow\"");
         daoParameters.setPluginClass("java.lang.String");
-        try {
-            new ApexDaoFactory().createApexDao(daoParameters);
-            fail("test shold throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("Specified Apex DAO plugin class \"java.lang.String\" "
-                            + "does not implement the ApexDao interface", e.getMessage());
-        }
+        assertThatThrownBy(() -> new ApexDaoFactory().createApexDao(daoParameters))
+            .hasMessage("Specified Apex DAO plugin class \"java.lang.String\" "
+                            + "does not implement the ApexDao interface");
     }
 
     @Test
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/EntityTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/EntityTest.java
index 370a4114f..f9b949701 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/EntityTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/dao/EntityTest.java
@@ -21,11 +21,10 @@
 
 package org.onap.policy.apex.model.basicmodel.dao;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -51,34 +50,16 @@ public class EntityTest {
 
         apexDao = new ApexDaoFactory().createApexDao(daoParameters);
 
-        try {
-            apexDao.init(null);
-            fail("Test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("Apex persistence unit parameter not set", e.getMessage());
-        }
-
-        try {
-            apexDao.init(daoParameters);
-            fail("Test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("Apex persistence unit parameter not set", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> apexDao.init(null))
+            .hasMessage("Apex persistence unit parameter not set");
+        assertThatThrownBy(() -> apexDao.init(daoParameters))
+            .hasMessage("Apex persistence unit parameter not set");
         daoParameters.setPluginClass("somewhere.over.the.rainbow");
         daoParameters.setPersistenceUnit("Dorothy");
-        try {
-            apexDao.init(daoParameters);
-            fail("Test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("Creation of Apex persistence unit \"Dorothy\" failed", e.getMessage());
-        }
-        try {
-            apexDao.create(new AxArtifactKey());
-            fail("Test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("Apex DAO has not been initialized", e.getMessage());
-        }
+        assertThatThrownBy(() -> apexDao.init(daoParameters))
+            .hasMessage("Creation of Apex persistence unit \"Dorothy\" failed");
+        assertThatThrownBy(() -> apexDao.create(new AxArtifactKey()))
+            .hasMessage("Apex DAO has not been initialized");
         apexDao.close();
     }
 
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelFileWriterTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelFileWriterTest.java
index d6ff31e50..331e57f47 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelFileWriterTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelFileWriterTest.java
@@ -1,27 +1,28 @@
 /*
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.model.basicmodel.handling;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.io.File;
 import java.io.IOException;
@@ -40,27 +41,26 @@ public class ApexModelFileWriterTest {
 
         File tempFile = File.createTempFile("ApexFileWriterTest", "test");
         File tempDir = tempFile.getParentFile();
-        tempFile.delete();
-        
+
         File jsonTempFile = new File(tempDir.getAbsolutePath() + "/aaa/ApexFileWriterTest.json");
         File xmlTempFile = new File(tempDir.getAbsolutePath() + "/ccc/ApexFileWriterTest.xml");
-        
+
         AxModel model = new DummyApexBasicModelCreator().getModel();
 
         modelFileWriter.apexModelWriteJsonFile(model, AxModel.class, jsonTempFile.getAbsolutePath());
         modelFileWriter.apexModelWriteXmlFile(model, AxModel.class, xmlTempFile.getAbsolutePath());
-        
+
         jsonTempFile.delete();
         xmlTempFile.delete();
         new File(tempDir.getAbsolutePath() + "/aaa").delete();
         new File(tempDir.getAbsolutePath() + "/ccc").delete();
-       
+
         jsonTempFile = new File(tempDir.getAbsolutePath() + "/aaa/bbb/ApexFileWriterTest.json");
         xmlTempFile = new File(tempDir.getAbsolutePath() + "/ccc/ddd/ApexFileWriterTest.xml");
-        
+
         modelFileWriter.apexModelWriteJsonFile(model, AxModel.class, jsonTempFile.getAbsolutePath());
         modelFileWriter.apexModelWriteXmlFile(model, AxModel.class, xmlTempFile.getAbsolutePath());
-                
+
         jsonTempFile.delete();
         xmlTempFile.delete();
 
@@ -68,28 +68,22 @@ public class ApexModelFileWriterTest {
         new File(tempDir.getAbsolutePath() + "/aaa").delete();
         new File(tempDir.getAbsolutePath() + "/ccc/ddd").delete();
         new File(tempDir.getAbsolutePath() + "/ccc").delete();
-        
+
         File dirA = new File(tempDir.getAbsolutePath() + "/aaa");
         //File dirB = new File(tempDir.getAbsolutePath() + "/aaa/bbb");
         dirA.createNewFile();
         //dirB.createNewFile();
-        
+
         jsonTempFile = new File(tempDir.getAbsolutePath() + "/aaa/bbb/ApexFileWriterTest.json");
         jsonTempFile = new File(tempDir.getAbsolutePath() + "/aaa/bbb/ApexFileWriterTest.xml");
+        final File jsonTempFile01 = jsonTempFile;
+        assertThatThrownBy(() -> modelFileWriter.apexModelWriteJsonFile(model, AxModel.class,
+                jsonTempFile01.getAbsolutePath()))
+                .hasMessageContaining("could not create directory");
 
-        try {
-            modelFileWriter.apexModelWriteJsonFile(model, AxModel.class, jsonTempFile.getAbsolutePath());
-            fail("this test should throw an exception here");
-        } catch (Exception e) {
-            assertTrue(e.getMessage().contains("could not create directory "));
-        }
-
-        try {
-            modelFileWriter.apexModelWriteXmlFile(model, AxModel.class, jsonTempFile.getAbsolutePath());
-            fail("this test should throw an exception here");
-        } catch (Exception e) {
-            assertTrue(e.getMessage().contains("could not create directory "));
-        }
+        assertThatThrownBy(() -> modelFileWriter.apexModelWriteXmlFile(model, AxModel.class,
+                jsonTempFile01.getAbsolutePath()))
+                .hasMessageContaining("could not create directory");
 
         dirA.delete();
 
@@ -97,23 +91,18 @@ public class ApexModelFileWriterTest {
         File fileB = new File(tempDir.getAbsolutePath() + "/aaa/bbb");
         dirA.mkdir();
         fileB.createNewFile();
-        
+
         jsonTempFile = new File(tempDir.getAbsolutePath() + "/aaa/bbb/ApexFileWriterTest.json");
         jsonTempFile = new File(tempDir.getAbsolutePath() + "/aaa/bbb/ApexFileWriterTest.xml");
 
-        try {
-            modelFileWriter.apexModelWriteJsonFile(model, AxModel.class, jsonTempFile.getAbsolutePath());
-            fail("this test should throw an exception here");
-        } catch (Exception e) {
-            assertTrue(e.getMessage().contains("error processing file "));
-        }
-
-        try {
-            modelFileWriter.apexModelWriteXmlFile(model, AxModel.class, jsonTempFile.getAbsolutePath());
-            fail("this test should throw an exception here");
-        } catch (Exception e) {
-            assertTrue(e.getMessage().contains("error processing file "));
-        }
+        File jsonTempFile02 = jsonTempFile;
+        assertThatThrownBy(() -> modelFileWriter.apexModelWriteJsonFile(model, AxModel.class,
+                jsonTempFile02.getAbsolutePath()))
+                .hasMessageContaining("error processing file");
+
+        assertThatThrownBy(() -> modelFileWriter.apexModelWriteXmlFile(model, AxModel.class,
+                jsonTempFile02.getAbsolutePath()))
+                .hasMessageContaining("error processing file");
 
         fileB.delete();
         dirA.delete();
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelReaderTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelReaderTest.java
index 7f2f813d8..92f6206bb 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelReaderTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelReaderTest.java
@@ -1,29 +1,30 @@
 /*
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.model.basicmodel.handling;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.io.BufferedReader;
 import java.io.ByteArrayInputStream;
@@ -52,144 +53,100 @@ public class ApexModelReaderTest {
     public void testModelReader() throws IOException, ApexException {
         AxModel model = new DummyApexBasicModelCreator().getModel();
         AxModel invalidModel = new DummyApexBasicModelCreator().getInvalidModel();
-        
+
         ApexModelWriter<AxModel> modelWriter = new ApexModelWriter<AxModel>(AxModel.class);
         modelWriter.setValidateFlag(true);
         modelWriter.setJsonOutput(true);
-        
+
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         modelWriter.write(model, baos);
-        
+
         ByteArrayOutputStream baosInvalid = new ByteArrayOutputStream();
         modelWriter.setValidateFlag(false);
         modelWriter.write(invalidModel, baosInvalid);
-        
+
         ApexModelReader<AxModel> modelReader = new ApexModelReader<AxModel>(AxModel.class, true);
-        
+
         modelReader.setValidateFlag(true);
         assertTrue(modelReader.getValidateFlag());
-        
+
         ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
         AxModel readModel = modelReader.read(bais);
         assertEquals(model, readModel);
-        
+
         ByteArrayInputStream baisInvalid = new ByteArrayInputStream(baosInvalid.toByteArray());
-        try {
-            modelReader.read(baisInvalid);
-            fail("test should throw an exceptino here");
-        } catch (Exception e) {
-            assertTrue(e.getMessage().startsWith("Apex concept validation failed"));
-        }
-        
+        assertThatThrownBy(() -> modelReader.read(baisInvalid))
+            .hasMessageStartingWith("Apex concept validation failed");
         modelReader.setValidateFlag(false);
         assertFalse(modelReader.getValidateFlag());
-        
+
         ByteArrayInputStream bais2 = new ByteArrayInputStream(baos.toByteArray());
         AxModel readModel2 = modelReader.read(bais2);
         assertEquals(model, readModel2);
-        
+
         modelWriter.setJsonOutput(false);
-        
+
         ByteArrayOutputStream baosXml = new ByteArrayOutputStream();
         modelWriter.write(model, baosXml);
-        
+
         ByteArrayInputStream baisXml = new ByteArrayInputStream(baosXml.toByteArray());
         AxModel readModelXml = modelReader.read(baisXml);
         assertEquals(model, readModelXml);
-        
+
         String dummyString = "SomeDummyText";
         ByteArrayInputStream baisDummy = new ByteArrayInputStream(dummyString.getBytes());
-        try {
-            modelReader.read(baisDummy);
-            fail("test should throw an exception here");
-        } catch (Exception e) {
-            assertEquals("format of input for Apex concept is neither JSON nor XML", e.getMessage());
-        }
-        
-        try {
-            ByteArrayInputStream nullBais = null;
-            modelReader.read(nullBais);
-            fail("test should throw an exception here");
-        } catch (Exception e) {
-            assertEquals("concept stream may not be null", e.getMessage());
-        }
-        
-        try {
+        assertThatThrownBy(() -> modelReader.read(baisDummy))
+            .hasMessage("format of input for Apex concept is neither JSON nor XML");
+        ByteArrayInputStream nullBais = null;
+        assertThatThrownBy(() -> modelReader.read(nullBais))
+            .hasMessage("concept stream may not be null");
+
+        assertThatThrownBy(() -> {
             FileInputStream fis = new FileInputStream(new File("somewhere/over/the/rainbow"));
             modelReader.read(fis);
-            fail("test should throw an exception here");
-        } catch (Exception e) {
-            assertTrue(e.getMessage().contains("rainbow"));
-        }
-        
-        File tempFile = File.createTempFile("Apex", "Dummy");
-        try {
-            BufferedReader br = new BufferedReader(new FileReader(tempFile));
-            br.close();
-            modelReader.read(br);
-            fail("test should throw an exception here");
-        } catch (Exception e) {
-            assertEquals("Unable to read Apex concept ", e.getMessage());
-        } finally {
-            tempFile.delete();
-        }
-        
+        }).hasMessageContaining("rainbow");
+        final File tempFile = File.createTempFile("Apex", "Dummy");
+        BufferedReader br = new BufferedReader(new FileReader(tempFile));
+        br.close();
+        assertThatThrownBy(() -> modelReader.read(br))
+             .hasMessage("Unable to read Apex concept ");
+        tempFile.delete();
         modelReader.setSchema(null);
-        
-        tempFile = File.createTempFile("Apex", "Dummy");
-        try {
-            modelReader.setSchema(tempFile.getCanonicalPath());
-            fail("test should throw an exception here");
-        } catch (Exception e) {
-            assertEquals("Unable to load schema", e.getMessage());
-        } finally {
-            tempFile.delete();
-        }
-        
+
+        final File tempFileA = File.createTempFile("Apex", "Dummy");
+        assertThatThrownBy(() -> modelReader.setSchema(tempFileA.getCanonicalPath()))
+            .hasMessage("Unable to load schema");
+        tempFile.delete();
         modelReader.setSchema("xml/example.xsd");
     }
 
     @Test
-    public void testSetInputTypeError() throws ApexModelException {
+    public void testSetInputTypeError() throws ApexModelException,
+        NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
         MockitoAnnotations.initMocks(this);
 
         ApexModelReader<AxModel> modelReader = new ApexModelReader<AxModel>(AxModel.class, true);
 
-        try {
-            Field marshallerField = modelReader.getClass().getDeclaredField("unmarshaller");
-            marshallerField.setAccessible(true);
-            marshallerField.set(modelReader, unmarshallerMock);
-            marshallerField.setAccessible(false);
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
+        Field marshallerField = modelReader.getClass().getDeclaredField("unmarshaller");
+        marshallerField.setAccessible(true);
+        marshallerField.set(modelReader, unmarshallerMock);
+        marshallerField.setAccessible(false);
 
-        try {
+        assertThatThrownBy(() -> {
             Mockito.doThrow(new JAXBException("Exception marshalling to JSON")).when(unmarshallerMock)
                 .unmarshal((StreamSource) Mockito.anyObject(), Mockito.anyObject());
 
             modelReader.read("{Hello}");
-            fail("Test should throw an exception here");
-        } catch (Exception jaxbe) {
-            assertEquals("Unable to unmarshal Apex concept ", jaxbe.getMessage());
-        }
-
-        try {
+        }).hasMessage("Unable to unmarshal Apex concept ");
+        assertThatThrownBy(() -> {
             Mockito.doThrow(new PropertyException("Exception setting JAXB property")).when(unmarshallerMock)
                 .setProperty(Mockito.anyString(), Mockito.anyString());
             modelReader.read("{Hello}");
-            fail("Test should throw an exception here");
-        } catch (Exception jaxbe) {
-            assertEquals("JAXB error setting unmarshaller for JSON input", jaxbe.getMessage());
-        }
-
-        try {
+        }).hasMessage("JAXB error setting unmarshaller for JSON input");
+        assertThatThrownBy(() -> {
             Mockito.doThrow(new PropertyException("Exception setting JAXB property")).when(unmarshallerMock)
                 .setProperty(Mockito.anyString(), Mockito.anyString());
             modelReader.read("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
-            fail("Test should throw an exception here");
-        } catch (Exception jaxbe) {
-            assertEquals("JAXB error setting unmarshaller for XML input", jaxbe.getMessage());
-        }
+        }).hasMessage("JAXB error setting unmarshaller for XML input");
     }
 }
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelStringWriterTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelStringWriterTest.java
index cad4e05f3..0b8d789ad 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelStringWriterTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelStringWriterTest.java
@@ -1,29 +1,29 @@
 /*
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.model.basicmodel.handling;
 
-import static org.junit.Assert.assertEquals;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.io.IOException;
 import org.junit.Test;
@@ -37,53 +37,33 @@ public class ApexModelStringWriterTest {
     public void testModelStringWriter() throws IOException, ApexException {
         AxModel basicModel = new DummyApexBasicModelCreator().getModel();
         assertNotNull(basicModel);
-       
+
         AxKeyInfo intKeyInfo   = basicModel.getKeyInformation().get("IntegerKIKey");
         AxKeyInfo floatKeyInfo = basicModel.getKeyInformation().get("FloatKIKey");
 
         // Ensure marshalling is OK
         ApexModelStringWriter<AxKeyInfo> stringWriter = new ApexModelStringWriter<AxKeyInfo>(true);
-        
+
         assertNotNull(stringWriter.writeJsonString(intKeyInfo,   AxKeyInfo.class));
         assertNotNull(stringWriter.writeJsonString(floatKeyInfo, AxKeyInfo.class));
-       
+
         assertNotNull(stringWriter.writeString(intKeyInfo,   AxKeyInfo.class, true));
         assertNotNull(stringWriter.writeString(floatKeyInfo, AxKeyInfo.class, true));
-       
+
         assertNotNull(stringWriter.writeString(intKeyInfo,   AxKeyInfo.class, false));
         assertNotNull(stringWriter.writeString(floatKeyInfo, AxKeyInfo.class, false));
-        
+
         assertNotNull(stringWriter.writeXmlString(intKeyInfo,   AxKeyInfo.class));
         assertNotNull(stringWriter.writeXmlString(floatKeyInfo, AxKeyInfo.class));
-        
-        try {
-            stringWriter.writeString(null, AxKeyInfo.class, true);
-            fail("test should thrown an exception here");
-        } catch (Exception e) {
-            assertEquals("concept may not be null", e.getMessage());
-        }
-        
-        try {
-            stringWriter.writeString(null, AxKeyInfo.class, false);
-            fail("test should thrown an exception here");
-        } catch (Exception e) {
-            assertEquals("concept may not be null", e.getMessage());
-        }
-        
-        try {
-            stringWriter.writeJsonString(null, AxKeyInfo.class);
-            fail("test should thrown an exception here");
-        } catch (Exception e) {
-            assertEquals("error writing JSON string", e.getMessage());
-        }
-        
-        try {
-            stringWriter.writeXmlString(null, AxKeyInfo.class);
-            fail("test should thrown an exception here");
-        } catch (Exception e) {
-            assertEquals("error writing XML string", e.getMessage());
-        }
-        
+
+        assertThatThrownBy(() -> stringWriter.writeString(null, AxKeyInfo.class, true))
+            .hasMessage("concept may not be null");
+        assertThatThrownBy(() -> stringWriter.writeString(null, AxKeyInfo.class, false))
+            .hasMessage("concept may not be null");
+        assertThatThrownBy(() -> stringWriter.writeJsonString(null, AxKeyInfo.class))
+            .hasMessage("error writing JSON string");
+        assertThatThrownBy(() -> stringWriter.writeXmlString(null, AxKeyInfo.class))
+            .hasMessage("error writing XML string");
         stringWriter.setValidateFlag(true);
         assertTrue(stringWriter.isValidateFlag());
     }
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelWriterTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelWriterTest.java
index 1b8461c4e..fbbe2467c 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelWriterTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelWriterTest.java
@@ -1,29 +1,30 @@
 /*
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.model.basicmodel.handling;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -75,126 +76,84 @@ public class ApexModelWriterTest {
 
         modelWriter.setValidateFlag(true);
         model.getKeyInformation().getKeyInfoMap().clear();
-        try {
-            modelWriter.write(model, baos);
-            fail("Test should throw an exception here");
-        } catch (Exception e) {
-            assertEquals("Apex concept xml (BasicModel:0.0.1) validation failed", e.getMessage().substring(0, 53));
-        }
+        assertThatThrownBy(() -> modelWriter.write(model, baos))
+            .hasMessageContaining("Apex concept xml (BasicModel:0.0.1) validation failed");
         model.getKeyInformation().generateKeyInfo(model);
 
-        try {
-            modelWriter.write(null, baos);
-            fail("Test should throw an exception here");
-        } catch (Exception e) {
-            assertEquals("concept may not be null", e.getMessage());
-        }
-
-        try {
-            ByteArrayOutputStream nullBaos = null;
-            modelWriter.write(model, nullBaos);
-            fail("Test should throw an exception here");
-        } catch (Exception e) {
-            assertEquals("concept stream may not be null", e.getMessage());
-        }
+        assertThatThrownBy(() -> modelWriter.write(null, baos))
+            .hasMessage("concept may not be null");
+
+        ByteArrayOutputStream nullBaos = null;
+        assertThatThrownBy(() -> modelWriter.write(model, nullBaos))
+            .hasMessage("concept stream may not be null");
     }
 
     @Test
-    public void testSetOutputTypeError() throws ApexModelException {
+    public void testSetOutputTypeError() throws ApexModelException, NoSuchFieldException, SecurityException,
+            IllegalArgumentException, IllegalAccessException, PropertyException {
         MockitoAnnotations.initMocks(this);
 
         ApexModelWriter<AxModel> modelWriter = new ApexModelWriter<AxModel>(AxModel.class);
 
-        try {
-            Field marshallerField = modelWriter.getClass().getDeclaredField("marshaller");
-            marshallerField.setAccessible(true);
-            marshallerField.set(modelWriter, marshallerMock);
-            marshallerField.setAccessible(false);
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            Mockito.doThrow(new PropertyException("Exception setting JAXB property")).when(marshallerMock)
-                .setProperty(Mockito.anyString(), Mockito.anyString());
-            modelWriter.setJsonOutput(true);
-            fail("Test should throw an exception here");
-        } catch (Exception jaxbe) {
-            assertEquals("JAXB error setting marshaller for JSON output", jaxbe.getMessage());
-        }
-
-        try {
-            Mockito.doThrow(new PropertyException("Exception setting JAXB property")).when(marshallerMock)
-                .setProperty(Mockito.anyString(), Mockito.anyString());
-            modelWriter.setJsonOutput(false);
-            fail("Test should throw an exception here");
-        } catch (Exception jaxbe) {
-            assertEquals("JAXB error setting marshaller for XML output", jaxbe.getMessage());
-        }
+        Field marshallerField = modelWriter.getClass().getDeclaredField("marshaller");
+        marshallerField.setAccessible(true);
+        marshallerField.set(modelWriter, marshallerMock);
+        marshallerField.setAccessible(false);
+        Mockito.doThrow(new PropertyException("Exception setting JAXB property")).when(marshallerMock)
+            .setProperty(Mockito.anyString(), Mockito.anyString());
+        assertThatThrownBy(() -> modelWriter.setJsonOutput(true))
+            .hasMessage("JAXB error setting marshaller for JSON output");
+        Mockito.doThrow(new PropertyException("Exception setting JAXB property")).when(marshallerMock)
+            .setProperty(Mockito.anyString(), Mockito.anyString());
+        assertThatThrownBy(() -> modelWriter.setJsonOutput(false))
+            .hasMessage("JAXB error setting marshaller for XML output");
     }
 
     @Test
-    public void testOutputJsonError() throws ApexModelException {
+    public void testOutputJsonError() throws ApexModelException, NoSuchFieldException, SecurityException,
+            IllegalArgumentException, IllegalAccessException, JAXBException {
         MockitoAnnotations.initMocks(this);
 
         ApexModelWriter<AxModel> modelWriter = new ApexModelWriter<AxModel>(AxModel.class);
 
-        try {
-            Field marshallerField = modelWriter.getClass().getDeclaredField("marshaller");
-            marshallerField.setAccessible(true);
-            marshallerField.set(modelWriter, marshallerMock);
-            marshallerField.setAccessible(false);
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
+        Field marshallerField = modelWriter.getClass().getDeclaredField("marshaller");
+        marshallerField.setAccessible(true);
+        marshallerField.set(modelWriter, marshallerMock);
+        marshallerField.setAccessible(false);
 
         modelWriter.setValidateFlag(false);
         modelWriter.setJsonOutput(true);
 
-        try {
-            ByteArrayOutputStream baos = new ByteArrayOutputStream();
-            AxModel model = new DummyApexBasicModelCreator().getModel();
-
-            Mockito.doThrow(new JAXBException("Exception marshalling to JSON")).when(marshallerMock)
-                .marshal((AxModel) Mockito.anyObject(), (Writer) Mockito.anyObject());
-
-            modelWriter.write(model, baos);
-            fail("Test should throw an exception here");
-        } catch (Exception jaxbe) {
-            assertEquals("Unable to marshal Apex concept to JSON", jaxbe.getMessage());
-        }
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        AxModel model = new DummyApexBasicModelCreator().getModel();
+        Mockito.doThrow(new JAXBException("Exception marshalling to JSON")).when(marshallerMock)
+            .marshal((AxModel) Mockito.anyObject(), (Writer) Mockito.anyObject());
+        assertThatThrownBy(() -> modelWriter.write(model, baos)).hasMessage("Unable to marshal Apex concept to JSON");
     }
 
     @Test
-    public void testOutputXmlError() throws ApexModelException {
+    public void testOutputXmlError() throws ApexModelException, NoSuchFieldException, SecurityException,
+            IllegalArgumentException, IllegalAccessException, JAXBException {
         MockitoAnnotations.initMocks(this);
 
         ApexModelWriter<AxModel> modelWriter = new ApexModelWriter<AxModel>(AxModel.class);
         modelWriter.setJsonOutput(false);
 
-        try {
-            Field marshallerField = modelWriter.getClass().getDeclaredField("marshaller");
-            marshallerField.setAccessible(true);
-            marshallerField.set(modelWriter, marshallerMock);
-            marshallerField.setAccessible(false);
-        } catch (Exception validationException) {
-            fail("test should not throw an exception");
-        }
+        Field marshallerField = modelWriter.getClass().getDeclaredField("marshaller");
+        marshallerField.setAccessible(true);
+        marshallerField.set(modelWriter, marshallerMock);
+        marshallerField.setAccessible(false);
 
         modelWriter.setValidateFlag(false);
         modelWriter.setJsonOutput(false);
 
-        try {
-            ByteArrayOutputStream baos = new ByteArrayOutputStream();
-            AxModel model = new DummyApexBasicModelCreator().getModel();
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        AxModel model = new DummyApexBasicModelCreator().getModel();
 
-            Mockito.doThrow(new JAXBException("Exception marshalling to JSON")).when(marshallerMock)
-                .marshal((AxModel) Mockito.anyObject(), (Document) Mockito.anyObject());
+        Mockito.doThrow(new JAXBException("Exception marshalling to JSON")).when(marshallerMock)
+            .marshal((AxModel) Mockito.anyObject(), (Document) Mockito.anyObject());
 
-            modelWriter.write(model, baos);
-            fail("Test should throw an exception here");
-        } catch (Exception jaxbe) {
-            assertEquals("Unable to marshal Apex concept to XML", jaxbe.getMessage());
-        }
+        assertThatThrownBy(() -> modelWriter.write(model, baos))
+            .hasMessage("Unable to marshal Apex concept to XML");
     }
 }
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportApexBasicModelTester.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportApexBasicModelTester.java
index 80e2e15b4..064a107e7 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportApexBasicModelTester.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportApexBasicModelTester.java
@@ -21,11 +21,11 @@
 
 package org.onap.policy.apex.model.basicmodel.handling;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 
 import org.junit.Before;
 import org.junit.Test;
-import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
 import org.onap.policy.apex.model.basicmodel.concepts.AxModel;
 import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
 import org.onap.policy.apex.model.basicmodel.dao.DaoParameters;
@@ -52,11 +52,8 @@ public class SupportApexBasicModelTester {
 
     @Test
     public void testApexModelVaidateObservation() throws Exception {
-        try {
-            testApexModel.testApexModelVaidateObservation();
-        } catch (final ApexException e) {
-            assertEquals("model should have observations", e.getMessage());
-        }
+        assertThatThrownBy(testApexModel::testApexModelVaidateObservation)
+            .hasMessage("model should have observations");
     }
 
     @Test
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportBasicModelTester.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportBasicModelTester.java
index 57df96089..2761d86da 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportBasicModelTester.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/handling/SupportBasicModelTester.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,9 +21,7 @@
 
 package org.onap.policy.apex.model.basicmodel.handling;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import org.junit.Test;
 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
@@ -37,12 +36,8 @@ public class SupportBasicModelTester {
             new DummyApexBasicModelCreator());
 
         testApexModel.testApexModelValid();
-        try {
-            testApexModel.testApexModelVaidateObservation();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertEquals("model should have observations", e.getMessage());
-        }
+        assertThatThrownBy(testApexModel::testApexModelVaidateObservation)
+            .hasMessage("model should have observations");
         testApexModel.testApexModelVaidateWarning();
         testApexModel.testApexModelVaidateInvalidModel();
         testApexModel.testApexModelVaidateMalstructured();
@@ -60,13 +55,8 @@ public class SupportBasicModelTester {
 
         testApexModel1.getModel().getKey().setVersion("0.0.2");
 
-        try {
-            testApexModel0.checkModelEquality(testApexModel0.getModel(), testApexModel1.getModel(),
-                "Models are not equal");
-            fail("test should throw an exception here");
-        } catch (ApexException ae) {
-            assertEquals("Models are not equal", ae.getMessage());
-        }
+        assertThatThrownBy(() -> testApexModel0.checkModelEquality(testApexModel0.getModel(), testApexModel1.getModel(),
+                "Models are not equal")).hasMessage("Models are not equal");
     }
 
     @Test
@@ -75,30 +65,14 @@ public class SupportBasicModelTester {
             new SupportApexModelCreator0());
 
         testApexModel.testApexModelValid();
-        try {
-            testApexModel.testApexModelVaidateObservation();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertEquals("model should have observations", e.getMessage());
-        }
-        try {
-            testApexModel.testApexModelVaidateWarning();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertEquals("model should have warnings", e.getMessage());
-        }
-        try {
-            testApexModel.testApexModelVaidateInvalidModel();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertEquals("model should not be valid ***validation of model successful***", e.getMessage());
-        }
-        try {
-            testApexModel.testApexModelVaidateMalstructured();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertEquals("model should not be valid ***validation of model successful***", e.getMessage());
-        }
+        assertThatThrownBy(() -> testApexModel.testApexModelVaidateObservation())
+            .hasMessage("model should have observations");
+        assertThatThrownBy(() -> testApexModel.testApexModelVaidateWarning())
+            .hasMessage("model should have warnings");
+        assertThatThrownBy(() -> testApexModel.testApexModelVaidateInvalidModel())
+            .hasMessage("model should not be valid ***validation of model successful***");
+        assertThatThrownBy(() -> testApexModel.testApexModelVaidateMalstructured())
+            .hasMessage("model should not be valid ***validation of model successful***");
     }
 
     @Test
@@ -106,24 +80,12 @@ public class SupportBasicModelTester {
         final TestApexModel<AxModel> testApexModel = new TestApexModel<AxModel>(AxModel.class,
             new SupportApexModelCreator1());
 
-        try {
-            testApexModel.testApexModelValid();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertTrue(e.getMessage().startsWith("model is invalid"));
-        }
-        try {
-            testApexModel.testApexModelVaidateObservation();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertTrue(e.getMessage().startsWith("model is invalid"));
-        }
-        try {
-            testApexModel.testApexModelVaidateWarning();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertTrue(e.getMessage().startsWith("model is invalid"));
-        }
+        assertThatThrownBy(() -> testApexModel.testApexModelValid())
+            .hasMessageStartingWith("model is invalid");
+        assertThatThrownBy(() -> testApexModel.testApexModelVaidateObservation())
+            .hasMessageStartingWith("model is invalid");
+        assertThatThrownBy(() -> testApexModel.testApexModelVaidateWarning())
+            .hasMessageStartingWith("model is invalid");
         testApexModel.testApexModelVaidateInvalidModel();
         testApexModel.testApexModelVaidateMalstructured();
     }
@@ -135,12 +97,8 @@ public class SupportBasicModelTester {
 
         testApexModel.testApexModelValid();
         testApexModel.testApexModelVaidateObservation();
-        try {
-            testApexModel.testApexModelVaidateWarning();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertEquals("model should have warnings", e.getMessage());
-        }
+        assertThatThrownBy(() -> testApexModel.testApexModelVaidateWarning())
+            .hasMessage("model should have warnings");
     }
 
     @Test
@@ -148,18 +106,10 @@ public class SupportBasicModelTester {
         final TestApexModel<AxModel> testApexModel = new TestApexModel<AxModel>(AxModel.class,
             new SupportApexModelCreator1());
 
-        try {
-            testApexModel.testApexModelWriteReadJson();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertTrue(e.getMessage().startsWith("error processing file"));
-        }
-
-        try {
-            testApexModel.testApexModelWriteReadXml();
-            fail("Test should throw an exception");
-        } catch (final Exception e) {
-            assertTrue(e.getMessage().startsWith("error processing file"));
-        }
+        assertThatThrownBy(() -> testApexModel.testApexModelWriteReadJson())
+            .hasMessageStartingWith("error processing file");
+
+        assertThatThrownBy(() -> testApexModel.testApexModelWriteReadXml())
+            .hasMessageStartingWith("error processing file");
     }
 }
diff --git a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/service/ModelServiceTest.java b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/service/ModelServiceTest.java
index 1ebfb6d71..746e10607 100644
--- a/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/service/ModelServiceTest.java
+++ b/model/basic-model/src/test/java/org/onap/policy/apex/model/basicmodel/service/ModelServiceTest.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +21,7 @@
 
 package org.onap.policy.apex.model.basicmodel.service;
 
-import static org.junit.Assert.assertEquals;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
@@ -36,13 +37,9 @@ public class ModelServiceTest {
         ModelService.clear();
 
         assertFalse(ModelService.existsModel(AxKeyInformation.class));
-        try {
-            ModelService.getModel(AxKeyInformation.class);
-        } catch (final Exception e) {
-            assertEquals("Model for org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation "
-                            + "not found in model service", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> ModelService.getModel(AxKeyInformation.class))
+            .hasMessage("Model for org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation "
+                            + "not found in model service");
         ModelService.registerModel(AxKeyInformation.class,
                         new DummyApexBasicModelCreator().getModel().getKeyInformation());
         assertTrue(ModelService.existsModel(AxKeyInformation.class));
@@ -51,13 +48,9 @@ public class ModelServiceTest {
         ModelService.deregisterModel(AxKeyInformation.class);
 
         assertFalse(ModelService.existsModel(AxKeyInformation.class));
-        try {
-            ModelService.getModel(AxKeyInformation.class);
-        } catch (final Exception e) {
-            assertEquals("Model for org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation "
-                            + "not found in model service", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> ModelService.getModel(AxKeyInformation.class))
+            .hasMessage("Model for org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation "
+                            + "not found in model service");
         ModelService.registerModel(AxKeyInformation.class,
                         new DummyApexBasicModelCreator().getModel().getKeyInformation());
         assertTrue(ModelService.existsModel(AxKeyInformation.class));
@@ -65,12 +58,8 @@ public class ModelServiceTest {
 
         ModelService.clear();
         assertFalse(ModelService.existsModel(AxKeyInformation.class));
-        try {
-            ModelService.getModel(AxKeyInformation.class);
-        } catch (final Exception e) {
-            assertEquals("Model for org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation "
-                            + "not found in model service", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> ModelService.getModel(AxKeyInformation.class))
+            .hasMessage("Model for org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation "
+                            + "not found in model service");
     }
 }
diff --git a/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextAlbumsTest.java b/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextAlbumsTest.java
index 0406543fb..74b000ff3 100644
--- a/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextAlbumsTest.java
+++ b/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextAlbumsTest.java
@@ -21,11 +21,11 @@
 
 package org.onap.policy.apex.model.contextmodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import org.junit.Test;
 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
@@ -57,13 +57,9 @@ public class ContextAlbumsTest {
         assertEquals("NewAlbumName:0.0.1", album.getKeys().get(0).getId());
         album.setKey(albumKey);
 
-        try {
-            album.setScope("");
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("parameter \"scope\": value \"\", does not match regular expression \"[A-Za-z0-9\\-_]+\"",
-                            e.getMessage());
-        }
+        assertThatThrownBy(() -> album.setScope(""))
+            .hasMessage("parameter \"scope\": value \"\", does not match regular expression "
+                    + "\"[A-Za-z0-9\\-_]+\"");
 
         album.setScope("NewAlbumScope");
         assertEquals("NewAlbumScope", album.getScope());
diff --git a/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextSchemasTest.java b/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextSchemasTest.java
index e5fc19a20..abe7c008f 100644
--- a/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextSchemasTest.java
+++ b/model/context-model/src/test/java/org/onap/policy/apex/model/contextmodel/concepts/ContextSchemasTest.java
@@ -21,11 +21,11 @@
 
 package org.onap.policy.apex.model.contextmodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import org.junit.Test;
 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
@@ -51,14 +51,9 @@ public class ContextSchemasTest {
         assertEquals("NewSchemaName:0.0.1", schema.getKey().getId());
         assertEquals("NewSchemaName:0.0.1", schema.getKeys().get(0).getId());
 
-        try {
-            schema.setSchemaFlavour("");
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("parameter \"schemaFlavour\": value \"\", "
-                            + "does not match regular expression \"[A-Za-z0-9\\-_]+\"", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> schema.setSchemaFlavour(""))
+            .hasMessage("parameter \"schemaFlavour\": value \"\", "
+                            + "does not match regular expression \"[A-Za-z0-9\\-_]+\"");
         schema.setSchemaFlavour("NewSchemaFlavour");
         assertEquals("NewSchemaFlavour", schema.getSchemaFlavour());
 
diff --git a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineModelTest.java b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineModelTest.java
index 6e4fbbf05..f3f2fb602 100644
--- a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineModelTest.java
+++ b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineModelTest.java
@@ -21,11 +21,11 @@
 
 package org.onap.policy.apex.model.enginemodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import org.junit.Test;
 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
@@ -63,13 +63,8 @@ public class EngineModelTest {
                 new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats);
         model.register();
 
-        try {
-            model.setKey(null);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("key may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> model.setKey(null))
+            .hasMessage("key may not be null");
         model.setKey(modelKey);
         assertEquals("ModelName:0.0.1", model.getKey().getId());
         assertEquals("ModelName:0.0.1", model.getKeys().get(0).getId());
@@ -80,13 +75,8 @@ public class EngineModelTest {
         model.setTimestamp(-1);
         assertTrue(model.getTimeStampString().matches("\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}.\\d{3}"));
 
-        try {
-            model.setState(null);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("state may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> model.setState(null))
+            .hasMessage("state may not be null");
         for (final AxEngineState state : AxEngineState.values()) {
             model.setState(state);
             assertEquals(state, model.getState());
@@ -95,13 +85,8 @@ public class EngineModelTest {
         model.setState(AxEngineState.READY);
         assertEquals(AxEngineState.READY, model.getState());
 
-        try {
-            model.setStats(null);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("stats may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> model.setStats(null))
+            .hasMessage("stats may not be null");
         model.setStats(stats);
         assertEquals(stats, model.getStats());
 
diff --git a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineStatsTest.java b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineStatsTest.java
index 9f48d1da5..5cb1bd40e 100644
--- a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineStatsTest.java
+++ b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/EngineStatsTest.java
@@ -21,6 +21,7 @@
 
 package org.onap.policy.apex.model.enginemodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
@@ -49,13 +50,8 @@ public class EngineStatsTest {
         final AxReferenceKey statsKey = new AxReferenceKey("EngineKey", "0.0.1", "EngineStats");
         final AxEngineStats stats = new AxEngineStats(statsKey);
 
-        try {
-            stats.setKey(null);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("key may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> stats.setKey(null))
+            .hasMessage("key may not be null");
         stats.setKey(statsKey);
         assertEquals("EngineKey:0.0.1:NULL:EngineStats", stats.getKey().getId());
         assertEquals("EngineKey:0.0.1:NULL:EngineStats", stats.getKeys().get(0).getId());
diff --git a/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ApexModelApiTest.java b/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ApexModelApiTest.java
index e7330ee47..02195e4db 100644
--- a/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ApexModelApiTest.java
+++ b/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ApexModelApiTest.java
@@ -1,4 +1,4 @@
-/*-
+/*
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
  *  Modifications Copyright (C) 2020 Nordix Foundation.
@@ -21,11 +21,10 @@
 
 package org.onap.policy.apex.model.modelapi;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 import java.io.File;
 import java.io.IOException;
@@ -144,24 +143,13 @@ public class ApexModelApiTest {
 
     @Test
     public void testApexModelUrl() throws IOException {
-        ApexModel apexModel = new ApexModelFactory().createApexModel(null, false);
-
+        final ApexModel apexModel = new ApexModelFactory().createApexModel(null, false);
+        //ApexApiResult result = null;
+        assertThatThrownBy(() -> apexModel.readFromUrl(null))
+            .isInstanceOf(IllegalArgumentException.class);
+        assertThatThrownBy(() -> apexModel.writeToUrl(null, true))
+            .isInstanceOf(IllegalArgumentException.class);
         ApexApiResult result = null;
-
-        try {
-            result = apexModel.readFromUrl(null);
-            fail("expecting an IllegalArgumentException");
-        } catch (final Exception e) {
-            assertTrue(e instanceof IllegalArgumentException);
-        }
-
-        try {
-            result = apexModel.writeToUrl(null, true);
-            fail("expecting an IllegalArgumentException");
-        } catch (final Exception e) {
-            assertTrue(e instanceof IllegalArgumentException);
-        }
-
         result = apexModel.readFromUrl("zooby/looby");
         assertEquals(ApexApiResult.Result.FAILED, result.getResult());
 
@@ -174,9 +162,10 @@ public class ApexModelApiTest {
         result = apexModel.writeToUrl("zooby://zooby/looby", false);
         assertEquals(ApexApiResult.Result.FAILED, result.getResult());
 
-        apexModel = new ApexModelFactory().createApexModel(null, false);
+        final ApexModel apexModelJSon = new ApexModelFactory().createApexModel(null, false);
 
         final File tempJsonModelFile = File.createTempFile("ApexModelTest", ".json");
+
         result = apexModel.saveToFile(tempJsonModelFile.getCanonicalPath(), false);
         assertEquals(ApexApiResult.Result.SUCCESS, result.getResult());
 
diff --git a/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelFacadeTest.java b/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelFacadeTest.java
index ac8f26095..a5f258e4c 100644
--- a/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelFacadeTest.java
+++ b/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelFacadeTest.java
@@ -1,28 +1,29 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.model.modelapi;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.fail;
 
 import java.util.Properties;
 import java.util.UUID;
@@ -33,22 +34,12 @@ public class ModelFacadeTest {
 
     @Test
     public void testModelFacade() {
-        try {
-            new ModelFacade(null, null, false);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("apexModel may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> new ModelFacade(null, null, false))
+            .hasMessage("apexModel may not be null");
         final ApexModel apexModel = new ApexModelFactory().createApexModel(null, false);
 
-        try {
-            new ModelFacade(apexModel, null, false);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("apexProperties may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> new ModelFacade(apexModel, null, false))
+            .hasMessage("apexProperties may not be null");
         final Properties modelProperties = new Properties();
         final ModelFacade mf = new ModelFacade(apexModel, modelProperties, false);
 
diff --git a/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelHandlerFacadeTest.java b/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelHandlerFacadeTest.java
index a34b4f474..4a1c3276c 100644
--- a/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelHandlerFacadeTest.java
+++ b/model/model-api/src/test/java/org/onap/policy/apex/model/modelapi/ModelHandlerFacadeTest.java
@@ -21,9 +21,9 @@
 
 package org.onap.policy.apex.model.modelapi;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.fail;
 
 import java.io.File;
 import java.io.IOException;
@@ -35,29 +35,19 @@ import org.onap.policy.common.utils.resources.TextFileUtils;
 
 /**
  * Test the model handler facade.
- * 
+ *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
 public class ModelHandlerFacadeTest {
 
     @Test
     public void testModelHandlerFacade() throws IOException {
-        try {
-            new ModelHandlerFacade(null, null, false);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("apexModel may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> new ModelHandlerFacade(null, null, false))
+            .hasMessage("apexModel may not be null");
         final ApexModel apexModel = new ApexModelFactory().createApexModel(null, false);
 
-        try {
-            new ModelHandlerFacade(apexModel, null, false);
-            fail("test should throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("apexProperties may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> new ModelHandlerFacade(apexModel, null, false))
+            .hasMessage("apexProperties may not be null");
         final Properties modelProperties = new Properties();
         final ModelHandlerFacade mhf = new ModelHandlerFacade(apexModel, modelProperties, false);
         assertNotNull(mhf);
diff --git a/model/policy-model/src/test/java/org/onap/policy/apex/model/policymodel/concepts/LogicTest.java b/model/policy-model/src/test/java/org/onap/policy/apex/model/policymodel/concepts/LogicTest.java
index 655df059a..7961d8e8e 100644
--- a/model/policy-model/src/test/java/org/onap/policy/apex/model/policymodel/concepts/LogicTest.java
+++ b/model/policy-model/src/test/java/org/onap/policy/apex/model/policymodel/concepts/LogicTest.java
@@ -21,6 +21,7 @@
 
 package org.onap.policy.apex.model.policymodel.concepts;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
@@ -103,21 +104,11 @@ public class LogicTest {
         result = logic.validate(result);
         assertEquals(ValidationResult.VALID, result.getValidationResult());
 
-        try {
-            logic.setLogicFlavour(null);
-            fail("test shold throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("parameter \"logicFlavour\" is null", e.getMessage());
-        }
-
-        try {
-            logic.setLogicFlavour("");
-            fail("test shold throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("parameter \"logicFlavour\": value \"\", "
-                            + "does not match regular expression \"[A-Za-z0-9\\-_]+\"", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> logic.setLogicFlavour(null))
+            .hasMessageContaining("parameter \"logicFlavour\" is null");
+        assertThatThrownBy(() -> logic.setLogicFlavour(""))
+            .hasMessage("parameter \"logicFlavour\": value \"\", "
+                    + "does not match regular expression \"[A-Za-z0-9\\-_]+\"");
         logic.setLogicFlavour(AxLogic.LOGIC_FLAVOUR_UNDEFINED);
         result = new AxValidationResult();
         result = logic.validate(result);
@@ -128,13 +119,7 @@ public class LogicTest {
         result = logic.validate(result);
         assertEquals(ValidationResult.VALID, result.getValidationResult());
 
-        try {
-            logic.setLogic(null);
-            fail("test shold throw an exception here");
-        } catch (final Exception e) {
-            assertEquals("logic may not be null", e.getMessage());
-        }
-
+        assertThatThrownBy(() -> logic.setLogic(null)).hasMessage("logic may not be null");
         logic.setLogic("");
         result = new AxValidationResult();
         result = logic.validate(result);