Add Spring ApplicationListener implementation to destroy all GemFire/Geode Mock Objects when configured ApplicationEvents are fired in a Spring context.

Resolves gh-20.

spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/mock/context/event/DestroyGemFireMockObjectsApplicationListenerUnitTests.java

@@ -0,0 +1,129 @@
+/*
+ *  Copyright 2019 the original author or authors.
+ *
+ *  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
+ *
+ *       https://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.
+ */
+package org.springframework.data.gemfire.tests.mock.context.event;
+
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import java.util.Arrays;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.context.ApplicationEvent;
+import org.springframework.context.event.ContextClosedEvent;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.test.context.TestContext;
+import org.springframework.test.context.event.AfterTestExecutionEvent;
+import org.springframework.test.context.event.BeforeTestExecutionEvent;
+
+/**
+ * The DestroyGemFireMockObjectsApplicationListenerUnitTests class...
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.springframework.context.ApplicationEvent
+ * @see org.springframework.data.gemfire.tests.mock.context.event.DestroyGemFireMockObjectsApplicationListener
+ * @see org.springframework.test.context.TestContext
+ * @since 0.0.16
+ */
+public class DestroyGemFireMockObjectsApplicationListenerUnitTests {
+
+	private DestroyGemFireMockObjectsApplicationListener listener;
+
+	@Before
+	public void configureListener() {
+
+		Iterable<Class<? extends ApplicationEvent>> destroyEvents =
+			Arrays.asList(ContextClosedEvent.class, AfterTestExecutionEvent.class);
+
+		this.listener = spy(new DestroyGemFireMockObjectsApplicationListener(destroyEvents));
+
+		doNothing().when(this.listener).destroyGemFireMockObjects();
+	}
+
+	@Test
+	public void destroysGemFireMockObjectsOnAfterTestExecutionEvent() {
+
+		AfterTestExecutionEvent mockEvent = mock(AfterTestExecutionEvent.class);
+
+		this.listener.onApplicationEvent(mockEvent);
+
+		verify(this.listener, times(1)).destroyGemFireMockObjects();
+	}
+
+	@Test
+	public void destroysGemFireMockObjectsOnAfterTestExecutionEventExtension() {
+
+		AfterTestExecutionEventExtension mockEvent = mock(AfterTestExecutionEventExtension.class);
+
+		this.listener.onApplicationEvent(mockEvent);
+
+		verify(this.listener, times(1)).destroyGemFireMockObjects();
+	}
+
+	@Test
+	public void destroysGemFireMockObjectsOnContextClosedEvent() {
+
+		ContextClosedEvent mockEvent = mock(ContextClosedEvent.class);
+
+		this.listener.onApplicationEvent(mockEvent);
+
+		verify(this.listener, times(1)).destroyGemFireMockObjects();
+	}
+
+	@Test
+	public void doesNotDestroyGemFireMockObjectsOnBeforeTestExecutionEvent() {
+
+		BeforeTestExecutionEvent mockEvent = mock(BeforeTestExecutionEvent.class);
+
+		this.listener.onApplicationEvent(mockEvent);
+
+		verify(this.listener, never()).destroyGemFireMockObjects();
+	}
+
+	@Test
+	public void doesNotDestroyGemFireMockObjectsOnContextRefreshedEvent() {
+
+		ContextRefreshedEvent mockEvent = mock(ContextRefreshedEvent.class);
+
+		this.listener.onApplicationEvent(mockEvent);
+
+		verify(this.listener, never()).destroyGemFireMockObjects();
+	}
+
+	@Test
+	public void doesNotDestroyGemFireMockObjectsOnRandomApplicationEvent() {
+
+		ApplicationEvent mockEvent = mock(ApplicationEvent.class);
+
+		this.listener.onApplicationEvent(mockEvent);
+
+		verify(this.listener, never()).destroyGemFireMockObjects();
+	}
+
+	static class AfterTestExecutionEventExtension extends AfterTestExecutionEvent {
+
+		AfterTestExecutionEventExtension(TestContext context) {
+			super(context);
+		}
+	}
+}