如何在maven和Testng中运行并行套件

<dependencies>
    <dependency>
        <groupId>org.testng</groupId>
        <artifactId>testng</artifactId>
        <version>7.4.0</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>3.0.0-M5</version>
            <configuration>
                <parallel>methods</parallel>
                <threadCount>5</threadCount>
                <suiteXmlFiles>
                    <suiteXmlFile>testng.xml</suiteXmlFile>
                </suiteXmlFiles>
            </configuration>
        </plugin>
    </plugins>
</build>

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Parallel Suite" parallel="tests" thread-count="5">
    <test name="Test 1">
        <classes>
            <class name="com.example.TestClass1"/>
        </classes>
    </test>
    <test name="Test 2">
        <classes>
            <class name="com.example.TestClass2"/>
        </classes>
    </test>
</suite>

public class TestClass1 {
    @Test
    public void testMethod1() {
        // 测试方法1的代码
    }
}

public class TestClass2 {
    @Test
    public void testMethod2() {
        // 测试方法2的代码
    }
}

mvn clean test