Migrating Junit4 tests to androidx: What causes 'delegate runner could not be loaded'?

Question

I am migrating my app to androidx, I can\'t seem to get my unit tests working. I took example from Google\'s AndroidJunitRunnerSample, which has been updated to use the new

Answer 1

Changing

@Test
void someTest() {
    // Testing here
}

to

@Test
public void someTest() {
    // Testing here
}

works for me.