AndroidX : No instrumentation registered! Must run under a registering instrumentation

Question

I\'m trying to run a local unit test that depends on the context, and was following this guide: https://developer.android.com/training/testing/unit-testing/local-unit-tests#

Answer 1

Next things are not mentioned on google test guide, but they are what I found:

1. androidx.test in case of unit tests is just an interface/api (I don't know what about instrumented tests) and it needs implementations, which is robolectric library. That's why robolectric dependency is also required: testImplementation "org.robolectric:robolectric:{version}"
2. @RunWith(AndroidJUnit4.class) is required. To get nondeprecated class you need to add: testImplementation "androidx.test.ext:junit:{version}". By the way this dependency has transitive junit4 dependensy.

Also you can faced with: Failed to create a Robolectric sandbox: Android SDK 29 requires Java 9 (have Java 8) in case you use java 8 and compileSdkVersion 29 or above. Here you can find how to deal with it.