java maven surefire插件未并行执行运行程序

Question

我在{}中设置了{}
理想情况下，根据我在互联网上获得的使用这些插件的帮助，我的设置应该并行运行cucumber Runner文件，但它们总是按顺序执行

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <fork>true</fork>
                    <executable>C:\Program Files\Java\jdk1.8.0_201\bin\javac.exe</executable>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.20</version>
                <configuration>
                    <parallel>classes</parallel>
                    <forkMode>perthread</forkMode>
                    <threadCount>2</threadCount>
                    <argLine>-Xmx1024m -XX:MaxPermSize=256m</argLine>
                    <includes>
                        <include>**/*Runner.java</include>
                    </includes>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
</build>