本文学习使用，
Espresso、Ui Automator、AndroidJUnitRunner
进行测试的具体细节
一 、在app gradle文件里面配置
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android {
defaultConfig {
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
}
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dependencies {
androidTestCompile 'com.android.support.test:runner:0.4'
// Set this dependency to use JUnit 4 rules
androidTestCompile 'com.android.support.test:rules:0.4'
// Set this dependency to build and run Espresso tests
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
// Set this dependency to build and run UI Automator tests
androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.2'
}

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二、 示例

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