Espresso使用时发生的错误列举

如果你在使用Espresso时发生了错误，而你恰好看到了我的这篇文章，可以看看下面有没有你遇到的问题。

一：Error:Conflict with dependency 'com.android.support:support-annotations'. Resolved versions for app (26.0.2) and test app (23.1.1) differ. See http://g.co/androidstudio/app-test-app-conflict for details.

解决：

build.gradle文件中的依赖改成下面这样子

androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2', {

        exclude group: 'com.android.support', module: 'support-annotations'

}

二：编写.java文件，找不到@RunWith()注解类

解决：

build.gradle文件中junit依赖要用testCompile，但不能用junit的debugCompile依赖

三：java.lang.RuntimeException: No activities found. Did you forget to launch the activity by calling getActivity() or startActivitySync or similar?

解决：

加@Rule注解到这句上：public ActivityTestRule mActivityTestRule = new ActivityTestRule<>(<YourActivity>.class);

四：Test running failed: Unable to find instrumentation info for: ComponentInfo{<yourpackage>/android.support.test.runner.AndroidJUnitRunner}

解决：

build.gragle文件中找到加这句（在android{}中）：android {

    defaultConfig {

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

}

五：android.support.test.espresso.NoActivityResumedException: No activities in stage RESUMED. Did you forget to launch the activity. (test.getActivity() or similar)?

解决：手机屏幕必须保持打开

六：junit.framework.AssertionFailedError: No tests found in <yourtest>

解决：

build.gragle文件中找到加这句（在android{}中）：android {

    defaultConfig {

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

}

最后附上Espresso的官方文档地址：https://developer.android.com/training/testing/espresso/setup