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-rw-r--r--utils-test/src/main/java/org/onap/policy/common/utils/test/ExceptionsTester.java588
1 files changed, 588 insertions, 0 deletions
diff --git a/utils-test/src/main/java/org/onap/policy/common/utils/test/ExceptionsTester.java b/utils-test/src/main/java/org/onap/policy/common/utils/test/ExceptionsTester.java
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index 00000000..8705c48c
--- /dev/null
+++ b/utils-test/src/main/java/org/onap/policy/common/utils/test/ExceptionsTester.java
@@ -0,0 +1,588 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Integrity Monitor
+ * ================================================================================
+ * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.test;
+
+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 java.lang.reflect.Constructor;
+
+/**
+ * Used to test various Exception subclasses. Uses reflection to identify the
+ * constructors that the subclass supports.
+ */
+public class ExceptionsTester {
+
+ /**
+ * Runs tests, on an Exception subclass, for all of the standard
+ * constructors. If the Exception subclass does not support a given type of
+ * constructor, then it skips that test.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return the number of constructors that the test found/tested
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int test(Class<T> claz) throws Exception {
+ int ncons = 0;
+
+ ncons += testDefault(claz);
+ ncons += testString(claz);
+ ncons += testThrowable(claz);
+ ncons += testException(claz);
+ ncons += testStringThrowable(claz);
+ ncons += testStringException(claz);
+ ncons += testStringThrowableBooleanBoolean(claz);
+ ncons += testStringExceptionBooleanBoolean(claz);
+
+ assertTrue(ncons > 0);
+
+ return ncons;
+ }
+
+ /**
+ * Tests exceptions created via the default constructor. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns null</li>
+ * <li><i>getCause()</i> returns null</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testDefault(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor();
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ T ex = cons.newInstance();
+
+ assertNotNull(ex.toString());
+ assertNull(ex.getMessage());
+ assertNull(ex.getCause());
+
+ return 1;
+ }
+
+ /**
+ * Tests exceptions created via the constructor that takes just a String.
+ * Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns null</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testString(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor(String.class);
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ T ex = cons.newInstance("hello");
+
+ assertNotNull(ex.toString());
+ assertEquals("hello", ex.getMessage());
+ assertNull(ex.getCause());
+
+ return 1;
+ }
+
+ /**
+ * Tests exceptions created via the constructor that takes just a Throwable.
+ * Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the cause's message</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testThrowable(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor(Throwable.class);
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ Throwable cause = new Throwable("expected exception");
+ T ex = cons.newInstance(cause);
+
+ assertEquals(ex.getMessage(), ex.getMessage());
+ assertNotNull(ex.toString());
+ assertEquals(cause, ex.getCause());
+
+ return 1;
+ }
+
+ /**
+ * Tests exceptions created via the constructor that takes just an
+ * Exception. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the cause's message</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testException(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor(Exception.class);
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ Exception cause = new Exception("expected exception");
+ T ex = cons.newInstance(cause);
+
+ assertNotNull(ex.toString());
+ assertEquals(ex.getMessage(), ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ return 1;
+ }
+
+ /**
+ * Tests exceptions created via the constructor that takes a String and a
+ * Throwable. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testStringThrowable(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor(String.class, Throwable.class);
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ Throwable cause = new Throwable("expected exception");
+ T ex = cons.newInstance("world", cause);
+
+ assertNotNull(ex.toString());
+ assertEquals("world", ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ return 1;
+ }
+
+ /**
+ * Tests exceptions created via the constructor that takes a String and an
+ * Exception. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testStringException(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor(String.class, Exception.class);
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ Exception cause = new Exception("expected exception");
+ T ex = cons.newInstance("world", cause);
+
+ assertNotNull(ex.toString());
+ assertEquals("world", ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ return 1;
+ }
+
+ /**
+ * Tests exceptions created via the constructor that takes a String, a
+ * Throwable, and two booleans. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * <li>suppressed exceptions can be added, if enabled</li>
+ * <li>the stack trace can be added, if enabled</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testStringThrowableBooleanBoolean(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor(String.class, Throwable.class, Boolean.TYPE, Boolean.TYPE);
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ // test each combination of "message" and "cause"
+ testMessageCauseCombos(cons);
+
+ // test each combination of the boolean flags
+ testSuppressStack(cons);
+ testSuppressNoStack(cons);
+ testNoSuppressStack(cons);
+ testNoSuppressNoStack(cons);
+
+ return 1;
+ }
+
+ /**
+ * Tests exceptions created via the constructor that takes a String, an
+ * Exception, and two booleans. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * <li>suppressed exceptions can be added, if enabled</li>
+ * <li>the stack trace can be added, if enabled</li>
+ * </ul>
+ *
+ * If the Exception subclass does not support this type of constructor, then
+ * this method simply returns.
+ *
+ * @param claz
+ * subclass to be tested
+ * @return {@code 1}, if the subclass supports this type of constructor,
+ * {@code 0} otherwise
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> int testStringExceptionBooleanBoolean(Class<T> claz) throws Exception {
+ Constructor<T> cons;
+
+ try {
+ cons = claz.getConstructor(String.class, Exception.class, Boolean.TYPE, Boolean.TYPE);
+
+ } catch (NoSuchMethodException | SecurityException e) {
+ // this constructor is not defined so nothing to test
+ return 0;
+ }
+
+ // test each combination of "message" and "cause"
+ testMessageCauseCombos(cons);
+
+ // test each combination of the boolean flags
+ testFlagCombos(cons);
+
+ return 1;
+ }
+
+ /**
+ * Tests each combination of values for the "message" and the "cause" when
+ * using the constructor that takes a String, a Throwable/Exception, and two
+ * booleans. Verifies that expected values are returned by <i>toString()/i>,
+ * <i>getMessage()</i>, and <i>getCause()</i>.
+ * </ul>
+ *
+ * @param cons
+ * constructor to be invoked
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ private <T extends Exception> void testMessageCauseCombos(Constructor<T> cons) throws Exception {
+ T ex;
+ Exception cause = new Exception("expected throwable");
+
+ ex = cons.newInstance(null, null, true, true);
+ assertNotNull(ex.toString());
+ assertNull(ex.getMessage());
+ assertNull(ex.getCause());
+
+ ex = cons.newInstance("abc", null, true, true);
+ assertNotNull(ex.toString());
+ assertEquals("abc", ex.getMessage());
+ assertNull(ex.getCause());
+
+ ex = cons.newInstance(null, cause, true, true);
+ assertNotNull(ex.toString());
+ assertNull(ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ ex = cons.newInstance("xyz", cause, true, true);
+ assertNotNull(ex.toString());
+ assertEquals("xyz", ex.getMessage());
+ assertEquals(cause, ex.getCause());
+ }
+
+ /**
+ * Tests each combination of values for the "message" and the "cause" when
+ * using the constructor that takes a String, a Throwable/Exception, and two
+ * booleans. Verifies that expected values are returned by <i>toString()/i>,
+ * <i>getMessage()</i>, and <i>getCause()</i>.
+ * </ul>
+ *
+ * @param cons
+ * constructor to be invoked
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> void testFlagCombos(Constructor<T> cons) throws Exception {
+ testSuppressStack(cons);
+ testSuppressNoStack(cons);
+ testNoSuppressStack(cons);
+ testNoSuppressNoStack(cons);
+ }
+
+ /**
+ * Tests exceptions constructed with {@code enableSuppression=true} and
+ * {@code writableStackTrace=true}. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * <li>suppressed exceptions are added</li>
+ * <li>the stack trace is added</li>
+ * </ul>
+ *
+ * @param cons
+ * the exception's class constructor
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> void testSuppressStack(Constructor<T> cons) throws Exception {
+ Exception cause = new Exception("expected exception");
+ Throwable supr = new Throwable("expected suppressed exception");
+ T ex = cons.newInstance("yes,yes", cause, true, true);
+
+ ex.addSuppressed(supr);
+
+ assertNotNull(ex.toString());
+ assertEquals("yes,yes", ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ assertEquals(1, ex.getSuppressed().length);
+ assertEquals(supr, ex.getSuppressed()[0]);
+
+ assertTrue(ex.getStackTrace().length > 0);
+ }
+
+ /**
+ * Tests exceptions constructed with {@code enableSuppression=true} and
+ * {@code writableStackTrace=false}. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * <li>suppressed exceptions are added</li>
+ * <li>the stack trace is <i>not</i> added</li>
+ * </ul>
+ *
+ * @param cons
+ * the exception's class constructor
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> void testSuppressNoStack(Constructor<T> cons) throws Exception {
+ Exception cause = new Exception("expected exception");
+ Throwable supr = new Throwable("expected suppressed exception");
+ T ex = cons.newInstance("yes,no", cause, true, false);
+
+ ex.addSuppressed(supr);
+
+ assertNotNull(ex.toString());
+ assertEquals("yes,no", ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ assertEquals(1, ex.getSuppressed().length);
+ assertEquals(supr, ex.getSuppressed()[0]);
+
+ assertEquals(0, ex.getStackTrace().length);
+ }
+
+ /**
+ * Tests exceptions constructed with {@code enableSuppression=false} and
+ * {@code writableStackTrace=true}. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * <li>suppressed exceptions are <i>not</i> added</li>
+ * <li>the stack trace is added</li>
+ * </ul>
+ *
+ * @param cons
+ * the exception's class constructor
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> void testNoSuppressStack(Constructor<T> cons) throws Exception {
+ Exception cause = new Exception("expected exception");
+ Throwable supr = new Throwable("expected suppressed exception");
+ T ex = cons.newInstance("no,yes", cause, false, true);
+
+ ex.addSuppressed(supr);
+
+ assertNotNull(ex.toString());
+ assertEquals("no,yes", ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ assertEquals(0, ex.getSuppressed().length);
+
+ assertTrue(ex.getStackTrace().length > 0);
+ }
+
+ /**
+ * Tests exceptions constructed with {@code enableSuppression=false} and
+ * {@code writableStackTrace=false}. Verifies that:
+ * <ul>
+ * <li><i>toString()</i> returns a non-null value</li>
+ * <li><i>getMessage()</i> returns the original message passed to the
+ * constructor</li>
+ * <li><i>getCause()</i> returns the original cause passed to the
+ * constructor</li>
+ * <li>suppressed exceptions are <i>not</i> added</li>
+ * <li>the stack trace is <i>not</i> added</li>
+ *
+ * @param cons
+ * the exception's class constructor
+ * @throws Exception
+ * if the Exception cannot be constructed
+ */
+ public <T extends Exception> void testNoSuppressNoStack(Constructor<T> cons) throws Exception {
+ Exception cause = new Exception("expected exception");
+ Throwable supr = new Throwable("expected suppressed exception");
+ T ex = cons.newInstance("no,no", cause, false, false);
+
+ ex.addSuppressed(supr);
+
+ assertNotNull(ex.toString());
+ assertEquals("no,no", ex.getMessage());
+ assertEquals(cause, ex.getCause());
+
+ assertEquals(0, ex.getSuppressed().length);
+ assertEquals(0, ex.getStackTrace().length);
+ }
+}