BAEL-1527 (#4324)

* commit first as binodpanta

* revert test change

* A short example of real-time event streaming using Spring WebFlux

* Code for http://jira.baeldung.com/browse/BAEL-1527

* remove unrelated files

* Apply feedback changes to rename test and remove link from readme file, ongoing work

* Update formatting fixes to code and add pom changes, that partially fix test runnning issues in IDE but not in cmdline

* Apply Eclipse formatter to test code and apply suggested pom fixes

* BAEL-1527 Formatting fix in pom.xml

testing-modules/junit-5/README.md

@@ -12,3 +12,5 @@
 - [JUnit Assert an Exception is Thrown](http://www.baeldung.com/junit-assert-exception)
 - [@Before vs @BeforeClass vs @BeforeEach vs @BeforeAll](http://www.baeldung.com/junit-before-beforeclass-beforeeach-beforeall)
 - [Migrating from JUnit 4 to JUnit 5](http://www.baeldung.com/junit-5-migration)
+
+

testing-modules/junit-5/pom.xml

@@ -56,6 +56,11 @@
     </build>
 
     <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>
@@ -96,8 +101,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.8</java.version>
         <junit.jupiter.version>5.1.0</junit.jupiter.version>
-        <junit.platform.version>1.0.1</junit.platform.version>
+        <junit.platform.version>1.1.0</junit.platform.version>
-        <junit.vintage.version>4.12.1</junit.vintage.version>
+        <junit.vintage.version>5.2.0</junit.vintage.version>
         <log4j2.version>2.8.2</log4j2.version>
         <h2.version>1.4.196</h2.version>
         <mockito.version>2.11.0</mockito.version>

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

@@ -0,0 +1,27 @@
+package com.baeldung;
+
+import com.baeldung.extensions.RegisterExtensionSampleExtension;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+/**
+ * This test demonstrates the use of the same extension in two ways.
+ * 1. Once as instance level field: Only method level callbacks are called.
+ * 2. Once as class level static field: All methods are called.
+ */
+public class RegisterExtensionUnitTest {
+
+    @RegisterExtension
+    static RegisterExtensionSampleExtension staticExtension = new RegisterExtensionSampleExtension("static version");
+
+    @RegisterExtension
+    RegisterExtensionSampleExtension instanceLevelExtension = new RegisterExtensionSampleExtension("instance version");
+
+    @Test
+    public void demoTest() {
+        Assertions.assertEquals("instance version", instanceLevelExtension.getType());
+    }
+
+}

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

@@ -0,0 +1,34 @@
+package com.baeldung.extensions;
+
+import org.junit.jupiter.api.extension.BeforeAllCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This extension is meant to demonstrate the use of RegisterExtension.
+ */
+public class RegisterExtensionSampleExtension implements BeforeAllCallback, BeforeEachCallback {
+
+    private final String type;
+    Logger logger = LoggerFactory.getLogger(RegisterExtensionSampleExtension.class);
+
+    public RegisterExtensionSampleExtension(String type) {
+        this.type = type;
+    }
+
+    @Override
+    public void beforeAll(ExtensionContext extensionContext) throws Exception {
+        logger.info("Type " + type + " In beforeAll : " + extensionContext.getDisplayName());
+    }
+
+    @Override
+    public void beforeEach(ExtensionContext extensionContext) throws Exception {
+        logger.info("Type " + type + " In beforeEach : " + extensionContext.getDisplayName());
+    }
+
+    public String getType() {
+        return type;
+    }
+}