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
Sequential test execution time
------------------------------------------------------- T E S T S ------------------------------------------------------- Running com.ourownjava.junit.TestUnitUnderTest2 TestUnitUnderTest2.shouldReturnMethod1()Sat Nov 29 19:04:19 EST 2014 TestUnitUnderTest2.shouldReturnMethod2()Sat Nov 29 19:04:21 EST 2014 TestUnitUnderTest2.shouldReturnMethod3()Sat Nov 29 19:04:23 EST 2014 Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.792 sec Running com.ourownjava.junit.TestUnitUnderTest1 TestUnitUnderTest1.shouldReturnMethod1()Sat Nov 29 19:04:25 EST 2014 TestUnitUnderTest1.shouldReturnMethod2()Sat Nov 29 19:04:27 EST 2014 TestUnitUnderTest1.shouldReturnMethod3()Sat Nov 29 19:04:29 EST 2014 Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.008 sec Results : Tests run: 6, Failures: 0, Errors: 0, Skipped: 0 [INFO] [INFO] --- maven-jar-plugin:2.2:jar (default-jar) @ junit-parallel-execution --- [INFO] Building jar: /home/thosan/java/gitrepo/junit-parallel-execution/junit-parallel-execution/target/junit-parallel-execution-0.0.1-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.3:install (default-install) @ junit-parallel-execution --- [INFO] Installing /home/thosan/java/gitrepo/junit-parallel-execution/junit-parallel-execution/target/junit-parallel-execution-0.0.1-SNAPSHOT.jar to /home/thosan/.m2/repository/com/ourownjava/junit-parallel-execution/0.0.1-SNAPSHOT/junit-parallel-execution-0.0.1-SNAPSHOT.jar [INFO] Installing /home/thosan/java/gitrepo/junit-parallel-execution/junit-parallel-execution/pom.xml to /home/thosan/.m2/repository/com/ourownjava/junit-parallel-execution/0.0.1-SNAPSHOT/junit-parallel-execution-0.0.1-SNAPSHOT.pom [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 17.908s [INFO] Finished at: Sat Nov 29 19:04:31 EST 2014 [INFO] Final Memory: 14M/172M [INFO] ------------------------------------------------------------------------
Test execution time for parallel test execution
------------------------------------------------------- T E S T S ------------------------------------------------------- Running com.ourownjava.junit.TestUnitUnderTest2 TestUnitUnderTest2.shouldReturnMethod1()Sat Nov 29 19:02:49 EST 2014 TestUnitUnderTest2.shouldReturnMethod3()Sat Nov 29 19:02:49 EST 2014 TestUnitUnderTest2.shouldReturnMethod2()Sat Nov 29 19:02:49 EST 2014 Running com.ourownjava.junit.TestUnitUnderTest1 TestUnitUnderTest1.shouldReturnMethod1()Sat Nov 29 19:02:49 EST 2014 TestUnitUnderTest1.shouldReturnMethod3()Sat Nov 29 19:02:49 EST 2014 TestUnitUnderTest1.shouldReturnMethod2()Sat Nov 29 19:02:49 EST 2014 Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.148 sec — in com.ourownjava.junit.TestUnitUnderTest1 Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.284 sec — in com.ourownjava.junit.TestUnitUnderTest2 Results : Tests run: 6, Failures: 0, Errors: 0, Skipped: 0 [INFO] [INFO] --- maven-jar-plugin:2.2:jar (default-jar) @ junit-parallel-execution --- [INFO] Building jar: /home/thosan/java/gitrepo/junit-parallel-execution/junit-parallel-execution/target/junit-parallel-execution-0.0.1-SNAPSHOT.jar [INFO] [INFO] --- maven-install-plugin:2.3:install (default-install) @ junit-parallel-execution --- [INFO] Installing /home/thosan/java/gitrepo/junit-parallel-execution/junit-parallel-execution/target/junit-parallel-execution-0.0.1-SNAPSHOT.jar to /home/thosan/.m2/repository/com/ourownjava/junit-parallel-execution/0.0.1-SNAPSHOT/junit-parallel-execution-0.0.1-SNAPSHOT.jar [INFO] Installing /home/thosan/java/gitrepo/junit-parallel-execution/junit-parallel-execution/pom.xml to /home/thosan/.m2/repository/com/ourownjava/junit-parallel-execution/0.0.1-SNAPSHOT/junit-parallel-execution-0.0.1-SNAPSHOT.pom [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 8.548s [INFO] Finished at: Sat Nov 29 19:02:52 EST 2014 [INFO] Final Memory: 14M/171M [INFO] ------------------------------------------------------------------------
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