设置 Espresso

在 Android 应用模块的 build.gradle 文件中添加下一个依赖项：

dependencies {   
    // Android JUnit Runner     
    androidTestCompile 'com.android.support.test:runner:0.5'
    // JUnit4 Rules
    androidTestCompile 'com.android.support.test:rules:0.5'
    // Espresso core
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    // Espresso-contrib for DatePicker, RecyclerView, Drawer actions, Accessibility checks, CountingIdlingResource
    androidTestCompile 'com.android.support.test.espresso:espresso-contrib:2.2.2'
    //UI Automator tests
    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.2.2'
}

在 build.gradle 文件中为 testInstrumentationRunner 参数指定 AndroidJUnitRunner。

android {

  defaultConfig {
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
  }

}

此外，添加此依赖项以提供意图模拟支持

androidTestCompile 'com.android.support.test.espresso:espresso-intents:2.2.2'

并添加此一个用于 webview 测试支持

// Espresso-web for WebView support
androidTestCompile 'com.android.support.test.espresso:espresso-web:2.2.2'