JUnit5 does this in a strange way and they don't make it obvious.
Try a recipe like this:
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<!-- See
https://junit.org/junit5/docs/current/user-guide/#running-tests-build-maven-config-params
-->
<!-- See
https://github.com/apache/maven-surefire/blob/418aa89724442f5f03b00e0616ec6f1b31fa0bfa/surefire-providers/surefire-junit-platform/src/main/java/org/apache/maven/surefire/junitplatform/JUnitPlatformProvider.java#L242-L262
-->
<!-- See
https://junit.org/junit5/docs/current/user-guide/#writing-tests-parallel-execution
-->
<properties>
<configurationParameters>
junit.jupiter.execution.parallel.enabled=true
junit.jupiter.execution.parallel.mode.default=concurrent
</configurationParameters>
</properties>
</configuration>
</plugin>
Best,
Laird
On Tue, Feb 16, 2021 at 2:04 PM Jay Crosley <jcros...@axon.com> wrote:
> I’m trying to get junit5 tests to run in parallel using the maven surefire
> plugin, as described on
> https://maven.apache.org/surefire/maven-surefire-plugin/examples/fork-options-and-parallel-execution.html.
> Despite configuration that looks correct, I can’t get them to run in
> parallel. I’ll paste my configuration and what I’ve tried and experienced
> so far. Any help is greatly appreciated!
>
> My surefire plugin configuration looks like this:
>
>
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-surefire-plugin</artifactId>
> <version>2.21.0</version>
> <dependencies>
> <dependency>
> <groupId>org.junit.platform</groupId>
> <artifactId>junit-platform-surefire-provider</artifactId>
> <version>1.2.0</version>
> </dependency>
> <dependency>
> <groupId>org.junit.jupiter</groupId>
> <artifactId>junit-jupiter-engine</artifactId>
> <version>5.2.0</version>
> </dependency>
> </dependencies>
> </plugin>
>
> And I have a maven profile setup with additional configuration for our
> integration tests, which includes the parallel configuration. The commented
> out configurations indicate all the things I’ve tried.
>
>
> <profile>
> <id>integration-tests-local</id>
> <build>
> <plugins>
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-surefire-plugin</artifactId>
> <version>${surefire.version}</version>
> <configuration>
> <parallel>classes</parallel>
> <threadCount>4</threadCount>
> <useUnlimitedThreads>true</useUnlimitedThreads>
> <!--
> <useUnlimitedThreads>true</useUnlimitedThreads>-->
> <!-- <threadCountClasses>4</threadCountClasses>-->
> <!-- <threadCountMethods>4</threadCountMethods>-->
> <!-- <threadCountSuites>4</threadCountSuites>-->
> <!-- <threadCount>4</threadCount>-->
> <parallelOptimized>false</parallelOptimized>
> <!--
> <parallelMavenExecution>true</parallelMavenExecution>-->
> <perCoreThreadCount>false</perCoreThreadCount>
> <excludes>
> <exclude>none</exclude>
> </excludes>
> <includes>
> <include>**/*IntegrationTests*.java</include>
> </includes>
> </configuration>
> </plugin>
> </plugins>
> </build>
>
> The project is structured with a parent pom.xml and several sub-projects.
> The tests are in the “integration-tests” module, which pulls in the
> surefire plugin with no additional configuration:
>
>
> <plugin>
> <artifactId>maven-surefire-plugin</artifactId>
> </plugin>
>
> I mention the sub-project because it means that the maven command I’m
> running looks like this (I’ve tried with/without the “-T”):
>
>
> mvn -T 4 test -e -pl integration-tests -am -Pintegration-tests-local
>
> For the purposes of debugging, I’ve created 10 .java files named
> TestIntegrationTests1.java through TestIntegrationTests10.java, each of
> which has 10 unit tests all of which look like this:
>
>
> package com.axon.scorpius.integration_tests;
>
> import static org.junit.jupiter.api.Assertions.assertTrue;
>
> import org.junit.jupiter.api.Test;
>
> /**
> * Tests.
> */
> public class TestIntegrationTests1 {
>
> @Test
> void test1() {
> try {
> Thread.sleep(1000);
> } catch (InterruptedException ex) {
> System.out.println("Interrupted exception: " + ex);
> }
>
> assertTrue(true);
> }
>
>
>
> … 9 identical tests
>
> My hope is that when I run “mvn test” (I’m running locally in iTerm on a
> Macbook), these 10 test classes will run in parallel (at least partially),
> but they run serially, as seen here:
>
> INFO] -------------------------------------------------------
> [INFO] T E S T S
> [INFO] -------------------------------------------------------
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests4
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.057 s - in com.axon.scorpius.integration_tests.TestIntegrationTests4
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests6
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.029 s - in com.axon.scorpius.integration_tests.TestIntegrationTests6
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests10
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.025 s - in com.axon.scorpius.integration_tests.TestIntegrationTests10
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests2
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.027 s - in com.axon.scorpius.integration_tests.TestIntegrationTests2
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests7
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.032 s - in com.axon.scorpius.integration_tests.TestIntegrationTests7
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests5
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.027 s - in com.axon.scorpius.integration_tests.TestIntegrationTests5
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests1
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.032 s - in com.axon.scorpius.integration_tests.TestIntegrationTests1
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests3
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.036 s - in com.axon.scorpius.integration_tests.TestIntegrationTests3
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests9
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.013 s - in com.axon.scorpius.integration_tests.TestIntegrationTests9
> [INFO] Running com.axon.scorpius.integration_tests.TestIntegrationTests8
> [INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time elapsed:
> 11.026 s - in com.axon.scorpius.integration_tests.TestIntegrationTests8
> [INFO]
> [INFO] Results:
> [INFO]
> [WARNING] Tests run: 113, Failures: 0, Errors: 0, Skipped: 2
>
