问Android Espresso不能与Multidex一起工作给出“未找到测试”

EN

minSdkVersion 14
targetSdkVersion 23
multiDexEnabled = true

testInstrumentationRunner "com.android.test.runner.MultiDexTestRunner"


androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
androidTestCompile 'com.android.support.test.espresso:espresso-contrib:2.2.1'
androidTestCompile 'com.android.support.test:runner:0.4.1'
androidTestCompile 'com.android.support.test:rules:0.4.1'

dexOptions {
        jumboMode true
        javaMaxHeapSize "4g"
        incremental true
    }

@RunWith(AndroidJUnit4.class)
@SmallTest
public class Test1AuthenticationEspressoTest {
    @Rule
    public ActivityTestRule<WelcomeActivity> mActivityRule = new  ActivityTestRule(WelcomeActivity.class);

}