Provide support for publishing TestContext lifecycle events

This commit introduces a new EventPublishingTestExecutionListener for
publishing events to the test ApplicationContext. These may be consumed
by @eventlistener annotated methods to react to the TestContext
lifecycle. The listener is not registered by default.

Closes gh-18490

Author: maverick1601

spring-test/src/main/java/org/springframework/test/context/TestExecutionListener.java

@@ -56,6 +56,8 @@
  * TransactionalTestExecutionListener}</li>
  * <li>{@link org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener
  * SqlScriptsTestExecutionListener}</li>
+ * <li>{@link org.springframework.test.context.event.EventPublishingTestExecutionListener
+ * EventPublishingTestExecutionListener} (not registered by default)</li>
  * </ul>
  *
  * @author Sam Brannen

spring-test/src/main/java/org/springframework/test/context/TestExecutionListeners.java

@@ -66,6 +66,7 @@
 	 * @see org.springframework.test.context.support.DirtiesContextTestExecutionListener
 	 * @see org.springframework.test.context.transaction.TransactionalTestExecutionListener
 	 * @see org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener
+	 * @see org.springframework.test.context.event.EventPublishingTestExecutionListener
 	 */
 	@AliasFor("value")
 	Class<? extends TestExecutionListener>[] listeners() default {};

spring-test/src/main/java/org/springframework/test/context/event/AfterTestClassEvent.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+
+/**
+ * {@link TestContextEvent} published by {@link EventPublishingTestExecutionListener} when
+ * {@link org.springframework.test.context.TestExecutionListener#afterTestClass(TestContext)} is called.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.AfterTestClass
+ */
+@SuppressWarnings("serial")
+public class AfterTestClassEvent extends TestContextEvent {
+
+    public AfterTestClassEvent(TestContext source) {
+        super(source);
+    }
+}

spring-test/src/main/java/org/springframework/test/context/event/AfterTestExecutionEvent.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+
+/**
+ * {@link TestContextEvent} published by {@link EventPublishingTestExecutionListener} when
+ * {@link org.springframework.test.context.TestExecutionListener#afterTestExecution(TestContext)} is called.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.AfterTestExecution
+ */
+@SuppressWarnings("serial")
+public class AfterTestExecutionEvent extends TestContextEvent {
+
+    public AfterTestExecutionEvent(TestContext source) {
+        super(source);
+    }
+
+}

spring-test/src/main/java/org/springframework/test/context/event/AfterTestMethodEvent.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+
+/**
+ * {@link TestContextEvent} published by {@link EventPublishingTestExecutionListener} when
+ * {@link org.springframework.test.context.TestExecutionListener#afterTestMethod(TestContext)} is called.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.AfterTestMethod
+ */
+@SuppressWarnings("serial")
+public class AfterTestMethodEvent extends TestContextEvent {
+
+    public AfterTestMethodEvent(TestContext source) {
+        super(source);
+    }
+
+}

spring-test/src/main/java/org/springframework/test/context/event/BeforeTestClassEvent.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+
+/**
+ * {@link TestContextEvent} published by {@link EventPublishingTestExecutionListener} when
+ * {@link org.springframework.test.context.TestExecutionListener#beforeTestClass(TestContext)} is called.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.BeforeTestClass
+ */
+@SuppressWarnings("serial")
+public class BeforeTestClassEvent extends TestContextEvent {
+
+    public BeforeTestClassEvent(TestContext source) {
+        super(source);
+    }
+
+}

spring-test/src/main/java/org/springframework/test/context/event/BeforeTestExecutionEvent.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+
+/**
+ * {@link TestContextEvent} published by {@link EventPublishingTestExecutionListener} when
+ * {@link org.springframework.test.context.TestExecutionListener#beforeTestExecution(TestContext)} is called.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.BeforeTestExecution
+ */
+@SuppressWarnings("serial")
+public class BeforeTestExecutionEvent extends TestContextEvent {
+
+    public BeforeTestExecutionEvent(TestContext source) {
+        super(source);
+    }
+
+}

spring-test/src/main/java/org/springframework/test/context/event/BeforeTestMethodEvent.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+
+/**
+ * {@link TestContextEvent} published by {@link EventPublishingTestExecutionListener} when
+ * {@link org.springframework.test.context.TestExecutionListener#beforeTestMethod(TestContext)} is called.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.BeforeTestMethod
+ */
+@SuppressWarnings("serial")
+public class BeforeTestMethodEvent extends TestContextEvent {
+
+    public BeforeTestMethodEvent(TestContext source) {
+        super(source);
+    }
+
+}

spring-test/src/main/java/org/springframework/test/context/event/EventPublishingTestExecutionListener.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+import org.springframework.test.context.support.AbstractTestExecutionListener;
+
+/**
+ * {@link org.springframework.test.context.TestExecutionListener} that may be used to publish test life-cycle event to
+ * the Spring test {@link org.springframework.context.ApplicationContext}.
+ *
+ * <p>These events may be consumed for various reasons, such as resetting {@em mock} beans or tracing test
+ * execution. Since these events may consumed as part of regular Spring beans, they can be shared among
+ * different test classes.
+ *
+ * <p>This {@link org.springframework.test.context.TestExecutionListener} is not active by default. Test classes
+ * should be annotated using {@link org.springframework.test.context.TestExecutionListeners}, if they want to use it.
+ * Alternatively, it may be added to {@code spring.factories}, if needed.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.BeforeTestClass
+ * @see org.springframework.test.context.event.annotation.PrepareTestInstance
+ * @see org.springframework.test.context.event.annotation.BeforeTestMethod
+ * @see org.springframework.test.context.event.annotation.BeforeTestExecution
+ * @see org.springframework.test.context.event.annotation.AfterTestExecution
+ * @see org.springframework.test.context.event.annotation.AfterTestMethod
+ * @see org.springframework.test.context.event.annotation.AfterTestClass
+ */
+public class EventPublishingTestExecutionListener extends AbstractTestExecutionListener {
+
+    @Override
+    public void beforeTestClass(TestContext testContext) {
+        testContext.getApplicationContext().publishEvent(
+                new BeforeTestClassEvent(testContext));
+    }
+
+    @Override
+    public void prepareTestInstance(TestContext testContext) {
+        testContext.getApplicationContext().publishEvent(
+                new PrepareTestInstanceEvent(testContext));
+    }
+
+    @Override
+    public void beforeTestMethod(TestContext testContext) {
+        testContext.getApplicationContext().publishEvent(
+                new BeforeTestMethodEvent(testContext));
+    }
+
+    @Override
+    public void beforeTestExecution(TestContext testContext) {
+        testContext.getApplicationContext().publishEvent(
+                new BeforeTestExecutionEvent(testContext));
+    }
+
+    @Override
+    public void afterTestExecution(TestContext testContext) {
+        testContext.getApplicationContext().publishEvent(
+                new AfterTestExecutionEvent(testContext));
+    }
+
+    @Override
+    public void afterTestMethod(TestContext testContext) {
+        testContext.getApplicationContext().publishEvent(
+                new AfterTestMethodEvent(testContext));
+    }
+
+    @Override
+    public void afterTestClass(TestContext testContext) {
+        testContext.getApplicationContext().publishEvent(
+                new AfterTestClassEvent(testContext));
+    }
+}

spring-test/src/main/java/org/springframework/test/context/event/PrepareTestInstanceEvent.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2019 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
+ *
+ *      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.
+ */
+
+package org.springframework.test.context.event;
+
+import org.springframework.test.context.TestContext;
+
+/**
+ * {@link TestContextEvent} published by {@link EventPublishingTestExecutionListener} when
+ * {@link org.springframework.test.context.TestExecutionListener#prepareTestInstance(TestContext)} is called.
+ *
+ * @author Frank Scheffler
+ * @since 5.2
+ * @see org.springframework.test.context.event.annotation.PrepareTestInstance
+ */
+@SuppressWarnings("serial")
+public class PrepareTestInstanceEvent extends TestContextEvent {
+
+    public PrepareTestInstanceEvent(TestContext source) {
+        super(source);
+    }
+
+}