How to write espresso testing in android without junit framework error

When I am trying to use Espresso or any testing for that matter I get an error that there are no tests found even though I have one written.

I have tried multiple different formats for this test and none of them are working. The example test in Android Studio throws the same error.

I am pretty new to testing and I am not sure if I am confusing JUnit testing and Espresso together. I would like to figure out how to use Espresso but I know my current tests are simple enough to simply use a JUnit.

 @RunWith(AndroidJUnit4.class)
    @LargeTest
    @FixMethodOrder(MethodSorters.NAME_ASCENDING)
    public class TestCaseA {

        @Rule
        public IntentsTestRule mActivityRule =
                new IntentsTestRule<>(homeLobby.class);


        @Before
        public void setUp() throws Exception {

        }

        @Test
        public void testEnsureIntentStarted() throws InterruptedException {
            onView(withId(R.id.buttonGame)).perform(click());
            assert( (Game.class.getName()).equals("Game"));
            System.out.print("TEST");
        }

        @After
        public void tearDown() throws Exception {
            //After Test case Execution
        }
    }

I am trying to get a simple test working to ensure I have Espresso set up properly but I am getting the error

junit.framework.AssertionFailedError: No tests found in package.TestCaseA

The information I have in the build.gradle is as follows

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    implementation 'org.java-websocket:Java-WebSocket:1.4.0'
    testImplementation 'junit:junit:4.12'

    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.1.0'
    androidTestImplementation 'androidx.test:runner:1.1.0'
    androidTestImplementation 'androidx.test:rules:1.1.0'
}