Running junit tests in parallel in a Maven build?

From junit 4.7 it's now possible to run tests in parallel without using TestNG. Actually it has been possible since 4.6, but there are a number of fixes being made in 4.7 that will make it a viable option. You may also run parallel tests with spring, which you can read about here

tempus-fugit offers something similar, check the docs for details. It relies on JUnit 4.7 and you just mark your test to @RunWith(ConcurrentTestRunner).

Cheers

TestNG can do that (this was my first reflex - then I saw you're already having a lot of testcases).

For JUnit, look at parallel-junit.

Another choice: Punner, a new parallel junit runner and maven plugin. You don't have to change your code, copy it to your pom.xml:

<!-- Disable default surefire based testing -->
<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-surefire-plugin</artifactId>
  <version>2.20</version>
  <configuration>
    <skip>true</skip>
  </configuration>
</plugin>

<plugin>
  <groupId>com.github.marks-yag</groupId>
  <artifactId>punner-maven-plugin</artifactId>
  <version>${version}</version>
  <configuration>
  </configuration>
  <executions>
    <execution>
      <id>test</id>
      <phase>test</phase>
      <goals>
        <goal>test</goal>
      </goals>
    </execution>
  </executions>
</plugin>

Punner can run test methods in parallel, can keep test outputs separately and clean.

Punner will reduce your mvn console outputs, like this:

[INFO] --- punner-maven-plugin:0.9.13:test (test) @ ipc ---
[INFO] Punner report directory: /Users/guile/workspace/ipc/target/punner-reports
[INFO]
[INFO] com.github.yag.ipc.IPCTest.testConnectionHandler.............. PASSED
[INFO] com.github.yag.ipc.IPCTest.testSequence....................... PASSED
[INFO] com.github.yag.ipc.IPCTest.testPartialContent................. PASSED
[INFO] com.github.yag.ipc.IPCTest.testResponseContent................ PASSED
[INFO] com.github.yag.ipc.IPCTest.testPingPong....................... PASSED
[INFO] com.github.yag.ipc.IPCTest.testServerClose.................... PASSED
[INFO] com.github.yag.ipc.IPCTest.testServerSideHeartbeatTimeout..... PASSED
[INFO] com.github.yag.ipc.IPCTest.testClientSideHeartbeatTimeout..... PASSED
[INFO] com.github.yag.ipc.IPCTest.testClientSideHeartbeat............ PASSED
[INFO] com.github.yag.ipc.IPCTest.testClientReconnect................ PASSED
[INFO]
[INFO] Tests run: 10, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 10.952 sec, Time saved: 25.919 sec.

Punner produce surefire compatible outputs, you can also get raw log data and a markdown format report from reports directory:

➜  ipc git:(develop) ll target/punner-reports
total 104
-rw-r--r--   1 guile  staff    11K Oct 15 23:07 TEST-com.github.yag.ipc.IPCTest.xml
-rw-r--r--   1 guile  staff   298B Oct 15 23:07 com.github.yag.ipc.IPCTest.txt
drwxr-xr-x  12 guile  staff   384B Oct  8 00:50 logs
-rw-r--r--   1 guile  staff    33K Oct 15 23:07 report.md

Punner is my personal project, I written Punner to speed up unit test phase of some other projects such as IPC framework, fine-grained locking, journal service, distributed workflow engine, etc. It saved a lot of my waiting time.

Punner don't support some advanced feature yet. I'm very glad if you could try it and give me some feedback.

You can change your test to be TestNg test in a minute (you just need to change imports), TestNG is the best in parallel testing.

You could try Gridgain that lets you run distribute your tests across a compute grid.