Fix code architecure in CrudAsyncResponseConsumer

- fix code complexity
- make code testable
- add missing tests

Change-Id: I542e7f603a5ffe956ae3fc3f58874b7dd2ce87a1
Issue-ID: AAI-1365
Signed-off-by: Bogumil Zebek <bogumil.zebek@nokia.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/src/test/java/org/onap/crud/service/CrudAsyncResponseConsumerTest.java b/src/test/java/org/onap/crud/service/CrudAsyncResponseConsumerTest.java
new file mode 100644
index 0000000..6e7cb3b
--- /dev/null
+++ b/src/test/java/org/onap/crud/service/CrudAsyncResponseConsumerTest.java
@@ -0,0 +1,115 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2018 Nokia
+ * ================================================================================
+ * 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.crud.service;
+
+import static junit.framework.TestCase.fail;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import com.google.common.collect.Lists;
+import java.util.ArrayList;
+import javax.naming.OperationNotSupportedException;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.onap.aai.event.api.EventConsumer;
+
+
+@RunWith(MockitoJUnitRunner.class)
+public class CrudAsyncResponseConsumerTest {
+
+    private static final ArrayList<String> EVENTS = Lists.newArrayList("event_json1", "event_json2");
+
+    @Mock
+    private EventConsumer eventConsumer;
+    @Mock
+    private GraphEventUpdater graphEventUpdater;
+
+    private CrudAsyncResponseConsumer crudAsyncResponseConsumer;
+
+    @Before
+    public void setUp() {
+        crudAsyncResponseConsumer = new CrudAsyncResponseConsumer(eventConsumer, graphEventUpdater);
+    }
+
+    @Test
+    public void shouldCommitOnlyOffsetsWhenEventsCollectionIsEmpty() throws Exception {
+        // given
+        when(eventConsumer.consume()).thenReturn(new ArrayList<>());
+
+        // when
+        crudAsyncResponseConsumer.run();
+
+        // then
+        verify(graphEventUpdater, never()).update(anyString());
+        verify(eventConsumer, times(1)).commitOffsets();
+    }
+
+    @Test
+    public void shouldCommitOnlyOffsetsWhenThereIsNoEventsToProcess() throws Exception {
+        // given
+        when(eventConsumer.consume()).thenReturn(null);
+
+        // when
+        crudAsyncResponseConsumer.run();
+
+        // then
+        verify(graphEventUpdater, never()).update(anyString());
+        verify(eventConsumer, times(1)).commitOffsets();
+    }
+
+    @Test
+    public void shouldProcessEventsWhenConsumerProvidesListOfEvents() throws Exception {
+        // given
+        when(eventConsumer.consume()).thenReturn(EVENTS);
+
+        // when
+        crudAsyncResponseConsumer.run();
+
+        // then
+        verify(graphEventUpdater, times(2)).update(anyString());
+        verify(eventConsumer, times(1)).commitOffsets();
+    }
+
+    @Test
+    public void shouldHandleAnyErrorCaseDuringCommitOffsets() throws Exception {
+        // given
+        when(eventConsumer.consume()).thenReturn(EVENTS);
+        doThrow(OperationNotSupportedException.class).when(eventConsumer).commitOffsets();
+
+        // when
+        try {
+            crudAsyncResponseConsumer.run();
+        } catch (Exception e) {
+            fail("Any error reported by run method is wrong!");
+        }
+
+        // then
+        verify(graphEventUpdater, times(2)).update(anyString());
+
+    }
+}
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