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

I had similar error and was struggling a lot to fix it. My problem was that I was mixing AndroidJUnit4, InstrumentationRegistry, ApplicationProvider and AndroidJUnitRunnerversions / packages. Make sure they all are of the same generation. These are the classes that made it all run for me:

• androidx.test.runner.AndroidJUnitRunner
• androidx.test.platform.app.InstrumentationRegistry
• androidx.test.ext.junit.runners.AndroidJUnit4
• androidx.test.core.app.ApplicationProvider

for these I needed the following in the dependencies part of my build.gradle

androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
androidTestImplementation 'androidx.test:core:1.1.0'
androidTestImplementation 'androidx.test.ext:junit:1.1.0'
androidTestImplementation "com.android.support:support-annotations:27.1.1"
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test:rules:1.0.2'

And of course the correct

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

in my defaultConfig of the build.gradle