Parallel JUnit Test Execution

JUnit test parallel execution can bring down the test execution time considerably. The only condition is that your test cases must be independent. The state shall not be shared across test cases. Today, I shall share a maven project with parallel test execution configured using maven surefire plugin.

The complete source code can be found in Github.

Surefire Plugin Configuration

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-surefire-plugin</artifactId>
   <version>2.18</version>
   <configuration>
      <forkCount>2</forkCount>  //fork two JVM instances
      <reuseForks>true</reuseForks> //reuse the JVM instance created
      <parallel>methods</parallel> //execute test method in a given calls parallely
      <useUnlimitedThreads>true</useUnlimitedThreads> //create as many threads as needed
   </configuration>
</plugin>

Written on March 20, 2018