项目中 gradle 配置

sourceSets {
    main {
        manifest.srcFile 'AndroidManifest.xml'
        java.srcDirs = ['src']
        resources.srcDirs = ['src']
        aidl.srcDirs = ['src']
        renderscript.srcDirs = ['src']
        res.srcDirs = ['res']
        assets.srcDirs = ['assets']
        jniLibs.srcDirs = ['libs']
    }
    // Move the tests to tests/java, tests/res, etc...
    instrumentTest.setRoot('tests')
    // Move the build types to build-types/<type>
    // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
    // This moves them out of them default location under src/<type>/... which would
    // conflict with src/ being used by the main source set.
    // Adding new build types or product flavors should be accompanied
    // by a similar customization.
    debug.setRoot('build-types/debug')
    release.setRoot('build-types/release')
}

原因

是这里出问题了 instrumentTest.setRoot(‘tests’) ，你可能在升级 Android Studio 时更新了项目的 gradle 配置，这里的配置中 instrumentTest 已被弃用，不适用于现在的 gradle 版本。

解决办法

用 androidTest 替换 instrumentTest，编译运行即可。