Test running failed: Unable to find instrumentation info for: ComponentInfo{} — error trying to test in IntelliJ with Gradle

Question

Everytime I try to run my tests the console says this:

Running tests
Test running startedTest running failed: Unable to find instrumentation info for:
ComponentI         


        

Answer 1

I had to do a combination of VikingGlen's answer, Liuting's answer, and this answer. This answer works for Android Studio version 2.1.

1. Run -> Edit Configurations... -> General -> Specific instrumentation runner (optional): "android.support.test.runner.AndroidJUnitRunner"

2. In build.gradle (the one with all your dependencies), put this:

defaultConfig {
   testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
} 

Then it could run tests of this type:

@RunWith(AndroidJUnit4.class)
@LargeTest
public class ApplicationTest {

    @Rule
    public ActivityTestRule mActivityTestRule = new ActivityTestRule<>(MainActivity.class);

    @Test
    public void login() {
        //Open Drawer to click on navigation.
        onView(withId(R.id.drawer_layout))
                .check(matches(isClosed(Gravity.LEFT))) // Left Drawer should be closed.
                .perform(open()); // Open Drawer
    }
}