如何使用testng和geb并行运行执行测试类

dependencies {
    testCompile 'org.testng:testng:7.4.0'
    testCompile 'org.gebish:geb-core:3.4.0'
    testCompile 'org.seleniumhq.selenium:selenium-chrome-driver:4.1.1'
}

import geb.Browser
import geb.spock.GebSpec
import org.testng.annotations.Test

class MyTest extends GebSpec {

    @Test
    void test1() {
        // 测试逻辑
    }

    @Test
    void test2() {
        // 测试逻辑
    }
}

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

gradle test