遇到了同样的问题.

Android Studio 有一个 bug，见 https://code.google.com/p/android/issues/detail?id=93730

There is a bug in Android Studio, see https://code.google.com/p/android/issues/detail?id=93730

他们建议在 build.gradle (app) 中删除，这为我解决了问题.

They recommend removing in build.gradle (app), this fixed the issue for me.

android {
    buildTypes {
        debug {
            ...
            testCoverageEnabled true
        }
    }
}