How Can I Parallelize Multiple Test Classes in Maven Builds Using Surefire?

Test Parallelization in Maven Builds

In a Maven build with JUnit 4.4, you encounter a bottleneck with numerous time-consuming integration tests. While parallelizing test methods within a single test class has been addressed, there remains a need for a cleaner solution that simultaneously executes multiple test classes. This article explores how to achieve this parallelization.

The solution lies in utilizing the Maven Surefire plugin. By incorporating the following configuration, you can specify the desired level of parallelism:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.7.1</version>
            <configuration>
                <parallel>classes</parallel>
                <threadCount>5</threadCount>
            </configuration>
        </plugin>
    </plugins>
</build>

By setting parallel to "classes," you instruct Surefire to run test classes concurrently. The specified threadCount of 5 indicates that up to five test classes will execute in parallel. This approach allows for significant performance improvements without the need to modify your tests.

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