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#kotlin and I set up my project like this (following this link : https://developer.android.com/training/testing/set-up-project ):

build.gradle(app)

android { compileSdkVersion 28 buildToolsVersion '27.0.3' defaultConfig {     minSdkVersion 21     targetSdkVersion 27     versionCode 76     versionName "2.6.0"     testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"     multiDexEnabled true  useLibrary 'android.test.runner'     useLibrary 'android.test.base'     useLibrary 'android.test.mock'  } testOptions {     unitTests.returnDefaultValues = true     unitTests.all {         // All the usual Gradle options.         testLogging {             events "passed", "skipped", "failed", "standardOut", "standardError"             outputs.upToDateWhen { false }             showStandardStreams = true         }     }     unitTests.includeAndroidResources = true  } dependencies { implementation fileTree(include: ['*.jar'], dir: 'libs')  androidTestImplementation("androidx.test.espresso:espresso-core:$espressoVersion", {     exclude group: 'com.android.support', module: 'support-annotations' }) // Espresso UI Testing dependencies implementation "androidx.test.espresso:espresso-idling-resource:$espressoVersion" androidTestImplementation "androidx.test.espresso:espresso-contrib:$espressoVersion" androidTestImplementation "androidx.test.espresso:espresso-intents:$espressoVersion"  testImplementation 'androidx.test:core:1.0.0'  // AndroidJUnitRunner and JUnit Rules androidTestImplementation 'androidx.test:runner:1.1.0' androidTestImplementation 'androidx.test:rules:1.1.0' // Espresso Assertions androidTestImplementation 'androidx.test.ext:junit:1.0.0' androidTestImplementation 'androidx.test.ext:truth:1.0.0' androidTestImplementation 'com.google.truth:truth:0.42'     implementation 'androidx.multidex:multidex:2.0.0' } 

My espresso_version is espressoVersion = '3.1.0'

My test that is located in module-name/src/test/java/ looks like this:

    import android.content.Context import androidx.test.core.app.ApplicationProvider import com.instacart.library.truetime.TrueTime import edu.mira.aula.shared.extensions.android.trueDateNow import edu.mira.aula.shared.network.ConnectivityHelper import kotlinx.coroutines.experimental.runBlocking import org.junit.Assert import org.junit.Before import org.junit.Test import java.util.* import java.util.concurrent.CountDownLatch  class TimeExtensionsUnitTest { private lateinit var instrumentationCtx: Context  @Before fun setup() {     instrumentationCtx = ApplicationProvider.getApplicationContext<Context>() }  @Test fun testTrueTimeValueReturnsIfInitialized() {     if (ConnectivityHelper.isOnline(instrumentationCtx)) {         runBlocking {             val countDownLatch = CountDownLatch(1)             TrueTime.build()                     .withSharedPreferencesCache(instrumentationCtx)                     .withConnectionTimeout(10000)                     .initialize()             countDownLatch.countDown()              try {                 countDownLatch.await()                 val dateFromTrueTime = trueDateNow()                 val normalDate = Date()                 Assert.assertNotEquals(dateFromTrueTime, normalDate)             } catch (e: InterruptedException) {             }         }     } } 

Everytime I run it, it gives me:

java.lang.IllegalStateException: No instrumentation registered! Must run under a registering instrumentation.  at androidx.test.platform.app.InstrumentationRegistry.getInstrumentation(InstrumentationRegistry.java:45)   at androidx.test.core.app.ApplicationProvider.getApplicationContext(ApplicationProvider.java:41) 

If I run it as a Instrumental Test(changing the package) it runs without errors. But I thought that this guide was exactly to be able to run unit test using Android Framework classes such as Context. I even tried run that class UnitTestSample but the same error occurs.

I also removed all android.support dependencies from my project

Any ideas on how to solve it?

Answer 1

Update

You should no longer encounter this error if youre using the latest gradle version.

---

I also encountered this issue.

If you look at migrating to Robolectric 4.0 here, it suggest to add the following line in your gradle.properties.

android.enableUnitTestBinaryResources=true 

The problem is that, if you add this you your gradle.properties, it will output this warning:

WARNING: The option setting 'android.enableUnitTestBinaryResources=true' is experimental and unsupported.

Now, if you look at Robolectric releases here. You could see that this is a known issue where they state that

Android Gradle Plugin may report the following warning, which may be safely ignored: WARNING: The option setting 'android.enableUnitTestBinaryResources=true' is experimental and unsupported.. Android Gradle Plugin 3.4 will resolve this issue.

I believe unless you could update you gradle to 3.4. You won't be able to solve this issue.

What I did instead was to include Robolectric 4.0 as dependency.

testImplementation "org.robolectric:robolectric:4.0.2" 

and annotate my test class with

@RunWith(RobolectricTestRunner::class) 

This should make your test work.

Now when you run the test, you'll notice that Robolectric will log the following:

[Robolectric] NOTICE: legacy resources mode is deprecated; see http://robolectric.org/migrating/#migrating-to-40

Ignore this for now but as soon as you could update your gradle, migrate to the new Robolectric testing.