BAEL-1843 - JUnit4 -> JUnit5 migration guide (#4816)

* Added code for the migration from JUnit 4 to JUnit 5

* Add example for Rule migration support

* Add fix to access modifiers to test methods

* Remove wrong header

* Add junit5-migration module and its code snippets

* Add module configuration to pom

* Remove test classes that were added for the migration from JUnit 4 to JUnit 5 article (moved under correct module)

pom.xml

@@ -905,6 +905,7 @@
 				<module>json</module>
 				<module>jsoup</module>
 				<module>testing-modules/junit-5</module>
+				<module>testing-modules/junit5-migration</module>
 				<module>jws</module>
 				<module>libraries-data</module>
 				<module>linkrest</module>

testing-modules/junit-5/pom.xml

@@ -33,6 +33,12 @@
             <version>${junit.vintage.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-migrationsupport</artifactId>
+            <version>${junit.vintage.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>

testing-modules/junit-5/src/test/java/com/baeldung/AssertionUnitTest.java

@@ -11,14 +11,17 @@ import java.util.Optional;
 import java.util.function.BooleanSupplier;
 
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
 /**
  * Unit test that demonstrate the different assertions available within JUnit 4
  */
+@DisplayName("Test case for assertions")
 public class AssertionUnitTest {
 
     @Test
+    @DisplayName("Arrays should be equals")
     public void whenAssertingArraysEquality_thenEqual() {
         char[] expected = {'J', 'u', 'p', 'i', 't', 'e', 'r'};
         char[] actual = "Jupiter".toCharArray();
@@ -27,6 +30,7 @@ public class AssertionUnitTest {
     }
 
     @Test
+    @DisplayName("The area of two polygons should be equal")
     public void whenAssertingEquality_thenEqual() {
         float square = 2 * 2;
         float rectangle = 2 * 2;

testing-modules/junit-5/src/test/java/com/baeldung/NestedUnitTest.java

@@ -10,13 +10,13 @@ import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
 public class NestedUnitTest {
+
     Stack<Object> stack;
-    boolean isRun = false;
 
     @Test
     @DisplayName("is instantiated with new Stack()")
     void isInstantiatedWithNew() {
-        new Stack<Object>();
+        new Stack<>();
     }
 
     @Nested
@@ -25,7 +25,7 @@ public class NestedUnitTest {
 
         @BeforeEach
         void init() {
-            stack = new Stack<Object>();
+            stack = new Stack<>();
         }
 
         @Test

testing-modules/junit-5/src/test/java/com/baeldung/migration/junit5/AssumptionUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.migration.junit5;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assumptions.assumeFalse;
@@ -10,19 +10,19 @@ import org.junit.jupiter.api.Test;
 public class AssumptionUnitTest {
 
     @Test
-    void trueAssumption() {
+    public void trueAssumption() {
-        assumeTrue(5 > 1);
+        assumeTrue(5 > 1, () -> "5 is greater the 1");
         assertEquals(5 + 2, 7);
     }
 
     @Test
-    void falseAssumption() {
+    public void falseAssumption() {
-        assumeFalse(5 < 1);
+        assumeFalse(5 < 1, () -> "5 is less then 1");
         assertEquals(5 + 2, 7);
     }
 
     @Test
-    void assumptionThat() {
+    public void assumptionThat() {
         String someString = "Just a string";
         assumingThat(someString.equals("Just a string"), () -> assertEquals(2 + 2, 4));
     }

testing-modules/junit5-migration/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+- [JUnit4 -> JUnit5 migration guide](http://www.baeldung.com/junit4-junit5-migration-guide)
+

testing-modules/junit5-migration/pom.xml

@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>junit5-migration</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>junit5-migration</name>
+    <description>JUnit 4 -> JUnit 5 migration</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-engine</artifactId>
+            <version>${junit.platform.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit.vintage.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-migrationsupport</artifactId>
+            <version>${junit.vintage.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <resources>
+            <resource>
+                <directory>src/test/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven-surefire-plugin.version}</version>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.junit.platform</groupId>
+                        <artifactId>junit-platform-surefire-provider</artifactId>
+                        <version>${junit.platform.version}</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>${exec-maven-plugin.version}</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <mainClass>com.baeldung.TestLauncher</mainClass>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <junit.jupiter.version>5.1.0</junit.jupiter.version>
+        <junit.platform.version>1.1.0</junit.platform.version>
+        <junit.vintage.version>5.2.0</junit.vintage.version>
+        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+        <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
+    </properties>
+
+</project>

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/AnnotationTestExampleUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.junit4;
+
+import com.baeldung.junit4.categories.Annotations;
+import com.baeldung.junit4.categories.JUnit4UnitTest;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+@Category(value = { Annotations.class, JUnit4UnitTest.class })
+public class AnnotationTestExampleUnitTest {
+    @Test(expected = Exception.class)
+    public void shouldRaiseAnException() throws Exception {
+        throw new Exception("This is my expected exception");
+    }
+
+    @Test(timeout = 1)
+    @Ignore
+    public void shouldFailBecauseTimeout() throws InterruptedException {
+        Thread.sleep(10);
+    }
+
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/AssertionUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.junit4;
+
+import org.junit.Assert;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+import static org.hamcrest.CoreMatchers.hasItems;
+import static org.junit.Assert.*;
+import static org.junit.Assert.assertArrayEquals;
+
+@DisplayName("Test case for assertions")
+public class AssertionUnitTest {
+
+    @Test
+    @DisplayName("Arrays should be equals")
+    public void whenAssertingArraysEquality_thenEqual() {
+        char[] expected = {'J', 'u', 'p', 'i', 't', 'e', 'r'};
+        char[] actual = "Jupiter".toCharArray();
+
+        assertArrayEquals("Arrays should be equal", expected, actual);
+    }
+
+    @Test
+    public void givenMultipleAssertion_whenAssertingAll_thenOK() {
+        assertEquals("4 is 2 times 2", 4, 2 * 2);
+        assertEquals("java", "JAVA".toLowerCase());
+        assertEquals("null is equal to null", null, null);
+    }
+
+    @Test
+    public void testAssertThatHasItems() {
+        assertThat(Arrays.asList("Java", "Kotlin", "Scala"), hasItems("Java", "Kotlin"));
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/AssumeUnitTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.junit4;
+
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assume.assumeFalse;
+import static org.junit.Assume.assumeTrue;
+
+public class AssumeUnitTest {
+
+    @Test
+    public void trueAssumption() {
+        assumeTrue("5 is greater the 1", 5 > 1);
+        assertEquals(5 + 2, 7);
+    }
+
+    @Test
+    public void falseAssumption() {
+        assumeFalse("5 is less then 1", 5 < 1);
+        assertEquals(5 + 2, 7);
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/ExceptionAssertionUnitTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.junit4;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+public class ExceptionAssertionUnitTest {
+
+    @Rule
+    public ExpectedException exceptionRule = ExpectedException.none();
+
+    @Test(expected = NullPointerException.class)
+    public void whenExceptionThrown_thenExpectationSatisfied() {
+        String test = null;
+        test.length();
+    }
+
+    @Test
+    public void whenExceptionThrown_thenRuleIsApplied() {
+        exceptionRule.expect(NumberFormatException.class);
+        exceptionRule.expectMessage("For input string");
+        Integer.parseInt("1a");
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/RuleExampleUnitTest.java

@@ -0,0 +1,16 @@
+package com.baeldung.junit4;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+public class RuleExampleUnitTest {
+
+    @Rule
+    public final TraceUnitTestRule traceRuleTests = new TraceUnitTestRule();
+
+    @Test
+    public void whenTracingTests() {
+        System.out.println("This is my test");
+        /*...*/
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/TestAnnotationsUnitTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.junit4;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+
+import java.util.logging.Logger;
+
+public class TestAnnotationsUnitTest {
+
+    private static final Logger log = Logger.getLogger(TestAnnotationsUnitTest.class.getName());
+
+    @BeforeClass
+    static void setup() {
+        log.info("@BeforeAll - executes once before all test methods in this class");
+    }
+
+    @Before
+    void init() {
+        log.info("@BeforeEach - executes before each test method in this class");
+    }
+
+    @After
+    void tearDown() {
+        log.info("@AfterEach - executed after each test method.");
+    }
+
+    @AfterClass
+    static void done() {
+        log.info("@AfterAll - executed after all test methods.");
+    }
+
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/TraceUnitTestRule.java

@@ -0,0 +1,35 @@
+package com.baeldung.junit4;
+
+import org.junit.rules.TestRule;
+import org.junit.runner.Description;
+import org.junit.runners.model.MultipleFailureException;
+import org.junit.runners.model.Statement;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class TraceUnitTestRule implements TestRule {
+
+    @Override
+    public Statement apply(Statement base, Description description) {
+
+        return new Statement() {
+            @Override
+            public void evaluate() throws Throwable {
+                List<Throwable> errors = new ArrayList<Throwable>();
+
+                System.out.println("Starting test ... " + description.getMethodName());
+                try {
+                    base.evaluate();
+                } catch (Throwable e) {
+                    errors.add(e);
+                } finally {
+                    System.out.println("... test finished. " + description.getMethodName());
+                }
+
+                MultipleFailureException.assertEmpty(errors);
+            }
+        };
+    }
+
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/categories/Annotations.java

@@ -0,0 +1,5 @@
+package com.baeldung.junit4.categories;
+
+public interface Annotations {
+
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit4/categories/JUnit4UnitTest.java

@@ -0,0 +1,5 @@
+package com.baeldung.junit4.categories;
+
+public interface JUnit4UnitTest {
+
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/AnnotationTestExampleUnitTest.java

@@ -0,0 +1,28 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+
+import java.time.Duration;
+
+@Tag("annotations")
+@Tag("junit5")
+@RunWith(JUnitPlatform.class)
+public class AnnotationTestExampleUnitTest {
+    @Test
+    public void shouldRaiseAnException() throws Exception {
+        Assertions.assertThrows(Exception.class, () -> {
+            throw new Exception("This is my expected exception");
+        });
+    }
+
+    @Test
+    @Disabled
+    public void shouldFailBecauseTimeout() throws InterruptedException {
+        Assertions.assertTimeout(Duration.ofMillis(1), () -> Thread.sleep(10));
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/AssertionUnitTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@DisplayName("Test case for assertions")
+public class AssertionUnitTest {
+
+    @Test
+    @DisplayName("Arrays should be equals")
+    public void whenAssertingArraysEquality_thenEqual() {
+        char[] expected = {'J', 'u', 'p', 'i', 't', 'e', 'r'};
+        char[] actual = "Jupiter".toCharArray();
+
+        assertArrayEquals(expected, actual, "Arrays should be equal");
+    }
+
+    @Test
+    @DisplayName("The area of two polygons should be equal")
+    public void whenAssertingEquality_thenEqual() {
+        float square = 2 * 2;
+        float rectangle = 2 * 2;
+
+        assertEquals(square, rectangle);
+    }
+
+    @Test
+    public void givenMultipleAssertion_whenAssertingAll_thenOK() {
+        assertAll(
+                "heading",
+                () -> assertEquals(4, 2 * 2, "4 is 2 times 2"),
+                () -> assertEquals("java", "JAVA".toLowerCase()),
+                () -> assertEquals(null, null, "null is equal to null")
+        );
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/AssumptionUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assumptions.*;
+
+public class AssumptionUnitTest {
+
+    @Test
+    public void trueAssumption() {
+        assumeTrue(5 > 1, () -> "5 is greater the 1");
+        assertEquals(5 + 2, 7);
+    }
+
+    @Test
+    public void falseAssumption() {
+        assumeFalse(5 < 1, () -> "5 is less then 1");
+        assertEquals(5 + 2, 7);
+    }
+
+    @Test
+    public void assumptionThat() {
+        String someString = "Just a string";
+        assumingThat(someString.equals("Just a string"), () -> assertEquals(2 + 2, 4));
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/ConditionalExecutionUnitTest.java

@@ -0,0 +1,69 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class ConditionalExecutionUnitTest {
+
+    @Test
+    @EnabledOnOs({OS.MAC})
+    void whenOperatingSystemIsMac_thenTestIsEnabled() {
+        assertEquals(5 + 2, 7);
+    }
+
+    @Test
+    @DisabledOnOs({OS.WINDOWS})
+    void whenOperatingSystemIsWindows_thenTestIsDisabled() {
+        assertEquals(5 + 2, 7);
+    }
+
+    @Test
+    @EnabledOnJre({JRE.JAVA_8})
+    void whenRunningTestsOnJRE8_thenTestIsEnabled() {
+        assertTrue(5 > 4, "5 is greater the 4");
+        assertTrue(null == null, "null is equal to null");
+    }
+
+    @Test
+    @DisabledOnJre({JRE.JAVA_10})
+    void whenRunningTestsOnJRE10_thenTestIsDisabled() {
+        assertTrue(5 > 4, "5 is greater the 4");
+        assertTrue(null == null, "null is equal to null");
+    }
+
+    @Test
+    @EnabledIfSystemProperty(named = "os.arch", matches = ".*64.*")
+    public void whenRunningTestsOn64BitArchitectures_thenTestIsDisabled() {
+        Integer value = 5; // result of an algorithm
+
+        assertNotEquals(0, value, "The result cannot be 0");
+    }
+
+    @Test
+    @DisabledIfSystemProperty(named = "ci-server", matches = "true")
+    public void whenRunningTestsOnCIServer_thenTestIsDisabled() {
+        Integer value = 5; // result of an algorithm
+
+        assertNotEquals(0, value, "The result cannot be 0");
+    }
+
+    @Test
+    @EnabledIfEnvironmentVariable(named = "ENV", matches = "staging-server")
+    public void whenRunningTestsStagingServer_thenTestIsEnabled() {
+        char[] expected = {'J', 'u', 'p', 'i', 't', 'e', 'r'};
+        char[] actual = "Jupiter".toCharArray();
+
+        assertArrayEquals(expected, actual, "Arrays should be equal");
+    }
+
+    @Test
+    @DisabledIfEnvironmentVariable(named = "ENV", matches = ".*development.*")
+    public void whenRunningTestsDevelopmentEnvironment_thenTestIsDisabled() {
+        char[] expected = {'J', 'u', 'p', 'i', 't', 'e', 'r'};
+        char[] actual = "Jupiter".toCharArray();
+
+        assertArrayEquals(expected, actual, "Arrays should be equal");
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/NestedUnitTest.java

@@ -0,0 +1,77 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.*;
+
+import java.util.EmptyStackException;
+import java.util.Stack;
+
+public class NestedUnitTest {
+
+    Stack<Object> stack;
+
+    @Test
+    @DisplayName("is instantiated with new Stack()")
+    void isInstantiatedWithNew() {
+        new Stack<>();
+    }
+
+    @Nested
+    @DisplayName("when new")
+    class WhenNew {
+
+        @BeforeEach
+        void init() {
+            stack = new Stack<>();
+        }
+
+        @Test
+        @DisplayName("is empty")
+        void isEmpty() {
+            Assertions.assertTrue(stack.isEmpty());
+        }
+
+        @Test
+        @DisplayName("throws EmptyStackException when popped")
+        void throwsExceptionWhenPopped() {
+            Assertions.assertThrows(EmptyStackException.class, () -> stack.pop());
+        }
+
+        @Test
+        @DisplayName("throws EmptyStackException when peeked")
+        void throwsExceptionWhenPeeked() {
+            Assertions.assertThrows(EmptyStackException.class, () -> stack.peek());
+        }
+
+        @Nested
+        @DisplayName("after pushing an element")
+        class AfterPushing {
+
+            String anElement = "an element";
+
+            @BeforeEach
+            void init() {
+                stack.push(anElement);
+            }
+
+            @Test
+            @DisplayName("it is no longer empty")
+            void isEmpty() {
+                Assertions.assertFalse(stack.isEmpty());
+            }
+
+            @Test
+            @DisplayName("returns the element when popped and is empty")
+            void returnElementWhenPopped() {
+                Assertions.assertEquals(anElement, stack.pop());
+                Assertions.assertTrue(stack.isEmpty());
+            }
+
+            @Test
+            @DisplayName("returns the element when peeked but remains not empty")
+            void returnElementWhenPeeked() {
+                Assertions.assertEquals(anElement, stack.peek());
+                Assertions.assertFalse(stack.isEmpty());
+            }
+        }
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/RuleExampleUnitTest.java

@@ -0,0 +1,17 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+@ExtendWith(TraceUnitExtension.class)
+public class RuleExampleUnitTest {
+
+    @Test
+    public void whenTracingTests() {
+        System.out.println("This is my test");
+        /*...*/
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/RuleMigrationSupportUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.junit5;
+
+import org.junit.Rule;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.migrationsupport.rules.EnableRuleMigrationSupport;
+import org.junit.rules.ExpectedException;
+
+@EnableRuleMigrationSupport
+public class RuleMigrationSupportUnitTest {
+
+    @Rule
+    public ExpectedException exceptionRule = ExpectedException.none();
+
+    @Test
+    public void whenExceptionThrown_thenExpectationSatisfied() {
+        exceptionRule.expect(NullPointerException.class);
+        String test = null;
+        test.length();
+    }
+
+    @Test
+    public void whenExceptionThrown_thenRuleIsApplied() {
+        exceptionRule.expect(NumberFormatException.class);
+        exceptionRule.expectMessage("For input string");
+        Integer.parseInt("1a");
+    }
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/TestAnnotationsUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.*;
+
+import java.util.logging.Logger;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class TestAnnotationsUnitTest {
+
+    private static final Logger log = Logger.getLogger(TestAnnotationsUnitTest.class.getName());
+
+    @BeforeAll
+    static void setup() {
+        log.info("@BeforeAll - executes once before all test methods in this class");
+    }
+
+    @BeforeEach
+    void init() {
+        log.info("@BeforeEach - executes before each test method in this class");
+    }
+
+    @Test
+    @Disabled
+    void disabledTest() {
+        assertTrue(false);
+    }
+
+    @AfterEach
+    void tearDown() {
+        log.info("@AfterEach - executed after each test method.");
+    }
+
+    @AfterAll
+    static void done() {
+        log.info("@AfterAll - executed after all test methods.");
+    }
+
+}

testing-modules/junit5-migration/src/test/java/com/baeldung/junit5/TraceUnitExtension.java

@@ -0,0 +1,19 @@
+package com.baeldung.junit5;
+
+import org.junit.jupiter.api.extension.AfterEachCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+public class TraceUnitExtension implements AfterEachCallback, BeforeEachCallback {
+
+    @Override
+    public void beforeEach(ExtensionContext context) throws Exception {
+        System.out.println("Starting test ... " + context.getDisplayName());
+    }
+
+    @Override
+    public void afterEach(ExtensionContext context) throws Exception {
+        System.out.println("... test finished. " + context.getDisplayName());
+    }
+
+}