[#472] Use JUnit 5 instead of JUnit 4

pom.xml

@@ -99,6 +99,13 @@
     <mojo.java.target>1.8</mojo.java.target>
     <maven.compiler.source>${mojo.java.target}</maven.compiler.source>
 
+    <!--
+     ! Version 64 of the parent POM will provide the dependency
+     ! information for JUnit. Therefore the entry in the dependency management
+     ! section can be removed if version 64 will be released.
+     ! Oliver B. Fischer // 2021-07-18
+     !-->
+    <junitBomVersion>5.7.2</junitBomVersion>
     <mavenVersion>3.0.5</mavenVersion>
     <wagonVersion>3.4.0</wagonVersion>
     <doxiaVersion>1.9.1</doxiaVersion>
@@ -108,6 +115,18 @@
     <project.build.outputTimestamp>2020-08-07T21:31:00Z</project.build.outputTimestamp>
   </properties>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.junit</groupId>
+        <artifactId>junit-bom</artifactId>
+        <version>${junitBomVersion}</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <dependencies>
     <dependency>
       <groupId>org.apache.maven.plugin-tools</groupId>
@@ -227,8 +246,13 @@
       <version>3.8.1</version>
     </dependency>
     <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.vintage</groupId>
+      <artifactId>junit-vintage-engine</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>