为什么我不能让我的testng套件通过gradlew从命令行运行

Question

我能够在Eclipse中运行gradle项目并查看生成的测试输出。但是，当我在命令上执行此操作时，测试报告中未显示任何内容。

我尝试了$ gradlew构建，然后尝试了$ gradlew干净测试。

apply plugin: 'eclipse'
apply plugin: 'java-library'

sourceCompatibility = 1.8
targetCompatibility = 1.8
tasks.withType(JavaCompile) {
       options.encoding = 'UTF-8'
}
repositories {
    // Use jcenter for resolving your dependencies.
    // You can declare any Maven/Ivy/file repository here.
    jcenter()
    mavenCentral()
}

dependencies {
    compile 'com.google.guava:guava:27.0.1-jre'
    compile 'org.seleniumhq.selenium:selenium-java:3.13.0'
    compile 'com.relevantcodes:extentreports:2.41.2'
    compile 'org.testng:testng:6.14.3'
}

test {
  useTestNG(){
  useDefaultListeners = true
  suites "testng.xml"
  }
}