[SUREFIRE-1207] A new JVM is forked even for tests not matching the "groups" tag when "reuseForks" is false

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.18.1
• Fix Version/s: Backlog
• Assignee: Unassigned
• Reporter: Michael Comerford
• Created: 11/Dec/15 12:50
• Updated: 19/Dec/19 20:08

Description

When the "groups" tag is used with "resuseForks" as false, a new fork is created for every test, not just the one in the group tag. The tests which don't match the group aren't ran, but a fork is still created and destroyed for every test, which is very inefficient.

Example:

<plugin>
    <artifactId>maven-surefire-plugin</artifactId>
    <configuration>
        <skip>true</skip>
    </configuration>
    <executions>
        <execution>
            <id>default-tests</id>
            <phase>test</phase>
            <goals>
                <goal>test</goal>
            </goals>
            <configuration>
                <skip>false</skip>
                <excludedGroups>IsolatedTests</excludedGroups>
            </configuration>
        </execution>
        <execution>
            <id>isolatedTests</id>
            <phase>test</phase>
            <goals>
                <goal>test</goal>
            </goals>
            <configuration>
                <skip>false</skip>
                <groups>IsolatedTests</groups>
                <forkCount>1</forkCount>
                <reuseForks>false</reuseForks>
            </configuration>
        </execution>
    </executions>
</plugin>

The forking can be seen when running maven in debug mode: mvn test -X and searching for the text "Forking command line"