BAEL-3300 The Spring TestExecutionListener (#7933)

* Added module for article

* Update pom.xml

* Delete pom.xml

* Update and rename ForecastProcessorTest.java to ForecastProcessorUnitTest.java

* Updated code as per review comments

* Delete .gitignore

* Update pom.xml

* BAEL-2904 Moved files

* BAEL-2904 Deleted files from previous project

* BAEL-2904 Moved classes for method reference article

* Update pom.xml

* BAEL-2904 Updated README.md

* First draft

* BAEL-3300 Added more tests

* BAEL-3300 Removed unused imports

* BAEL-3300 Run dos2unix on README.md

testing-modules/spring-testing/src/main/java/com/baeldung/testexecutionlisteners/AdditionService.java

@@ -0,0 +1,10 @@
+package com.baeldung.testexecutionlisteners;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class AdditionService {
+    public int add(int a, int b) {
+        return a + b;
+    }
+}

testing-modules/spring-testing/src/test/java/com/baeldung/testexecutionlisteners/AdditionServiceUnitTest.java

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+package com.baeldung.testexecutionlisteners;
+
+import static org.junit.Assert.assertThat;
+
+import org.hamcrest.Matchers;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = AdditionService.class)
+public class AdditionServiceUnitTest {
+    @Autowired
+    private AdditionService additionService;
+
+    @Test
+    public void whenValidNumbersPassed_thenReturnSum() {
+        assertThat(additionService.add(5, 13), Matchers.is(18));
+    }
+}

testing-modules/spring-testing/src/test/java/com/baeldung/testexecutionlisteners/CustomTestExecutionListener.java

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+package com.baeldung.testexecutionlisteners;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.core.Ordered;
+import org.springframework.test.context.TestContext;
+import org.springframework.test.context.TestExecutionListener;
+
+public class CustomTestExecutionListener implements TestExecutionListener, Ordered {
+    private static final Logger logger = LoggerFactory.getLogger(CustomTestExecutionListener.class);
+    
+    public void beforeTestClass(TestContext testContext) throws Exception {
+        logger.info("beforeTestClass : {}", testContext.getTestClass());
+    }; 
+    
+    public void prepareTestInstance(TestContext testContext) throws Exception {
+        logger.info("prepareTestInstance : {}", testContext.getTestClass());
+    }; 
+    
+    public void beforeTestMethod(TestContext testContext) throws Exception {
+        logger.info("beforeTestMethod : {}", testContext.getTestMethod());
+    }; 
+    
+    public void afterTestMethod(TestContext testContext) throws Exception {
+        logger.info("afterTestMethod : {}", testContext.getTestMethod());
+    }; 
+    
+    public void afterTestClass(TestContext testContext) throws Exception {
+        logger.info("afterTestClass : {}", testContext.getTestClass());
+    }
+
+    @Override
+    public int getOrder() {
+        return Integer.MAX_VALUE;
+    };
+}

testing-modules/spring-testing/src/test/java/com/baeldung/testexecutionlisteners/TestExecutionListenersWithMergeModeUnitTest.java

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+package com.baeldung.testexecutionlisteners;
+
+import static org.junit.Assert.assertThat;
+
+import org.hamcrest.Matchers;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.TestExecutionListeners;
+import org.springframework.test.context.TestExecutionListeners.MergeMode;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@TestExecutionListeners(value = { CustomTestExecutionListener.class }, 
+    mergeMode = MergeMode.MERGE_WITH_DEFAULTS)
+@ContextConfiguration(classes = AdditionService.class)
+public class TestExecutionListenersWithMergeModeUnitTest {
+    @Autowired
+    private AdditionService additionService;
+
+    @Test
+    public void whenValidNumbersPassed_thenReturnSum() {
+        assertThat(additionService.add(5, 13), Matchers.is(18));
+    }
+}

testing-modules/spring-testing/src/test/java/com/baeldung/testexecutionlisteners/TestExecutionListenersWithoutMergeModeUnitTest.java

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+package com.baeldung.testexecutionlisteners;
+
+import static org.junit.Assert.assertThat;
+
+import org.hamcrest.Matchers;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.TestExecutionListeners;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.context.support.DependencyInjectionTestExecutionListener;
+
+@RunWith(SpringRunner.class)
+@TestExecutionListeners(value = {CustomTestExecutionListener.class,
+        DependencyInjectionTestExecutionListener.class})
+@ContextConfiguration(classes = AdditionService.class)
+public class TestExecutionListenersWithoutMergeModeUnitTest {
+    @Autowired
+    private AdditionService additionService;
+
+    @Test
+    public void whenValidNumbersPassed_thenReturnSum() {
+        assertThat(additionService.add(5, 13), Matchers.is(18));
+    }
+}

testing-modules/spring-testing/src/test/resources/META-INF/spring.factories

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+# Test Execution Listeners
+org.springframework.test.context.TestExecutionListener=\
+com.baeldung.testexecutionlisteners.CustomTestExecutionListener