public class ExampleInstrumentedTest 报错

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在 gradle 中添加

dependencies { 

androidTestCompile(
'com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})

testImplementation 'junit:junit:4.12'

}

android studio 2.3版本 需要加上

 androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})