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<MainActivity> 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
    }
}

Answer 2

I had this problem and fixed it by going to Run -> Edit Configurations -> Green '+' button at the top left -> JUnit

From there, set the 'use the classpath mod...' to 'app' (or your default app name, which is the one that appears to the left of the run (play button) when you run the app)

Finally, put your test class name in the 'class:' textbox. Click apply and okay.

At this point, if the test class doesn't have other errors, it should work.

Answer 3

The solution for my problem is to change the method name from

@Test
public void test() {
    ...
}

to

@Test
public void testSomething() {
    ...
}

Hope it helps someone.

Answer 4

This is what I noticed in my project, in my app(main) module build.gradle I had the following buildType configuration

buildTypes {
        debug {
            multiDexEnabled true
        }

        mock {
            initWith(buildTypes.debug)
        }
    }
testBuildType "mock"

When I used AndroidJUnitRunner as the test runner(both from Android Studio) and as testInstrumentationRunner in build.gradle, tests ran without hitch.

In a submodule that had multiDexEnabled true as defaultConfig

defaultConfig {
    multiDexEnabled true
    ....
}

I ran into the problem of

Test running startedTest running failed: Unable to find instrumentation info for:{mypackage.x.y/android.support.test.runner.AndroidJUnitRunner"}

when I specified AndroidJUnitRunner in IDE and the submodule build.gradle. And this was fixed by specifying MultiDexTestRunner as the test runner in IDE/build.gradle.

To summarize, Use MultiDexTestRunner to run tests when multiDexEnabled true is specified in build.gradle, else use AndroidJUnitRunner as the test runner.