[FIXED] Cast Exception – AndroidJUnitRunner cannot be cast to RoboMonitoringInstrumentation

Issue

Working on Android Instrumented Test to launch and test this fragment

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But I am running to this nasty error.

java.lang.ClassCastException: androidx.test.runner.AndroidJUnitRunner cannot be cast to org.robolectric.android.fakes.RoboMonitoringInstrumentation
at org.robolectric.android.internal.LocalActivityInvoker.getInstrumentation(LocalActivityInvoker.java:153)
at org.robolectric.android.internal.LocalActivityInvoker.startActivity(LocalActivityInvoker.java:40)
at androidx.test.core.app.ActivityScenario.launchInternal(ActivityScenario.java:265)
at androidx.test.core.app.ActivityScenario.launch(ActivityScenario.java:226)
at androidx.fragment.app.testing.FragmentScenario$Companion.internalLaunch$fragment_testing_release(FragmentScenario.kt:588)
at androidx.fragment.app.testing.FragmentScenario$Companion.launchInContainer(FragmentScenario.kt:559)
at com.example.android.architecture.blueprints.todoapp.taskdetail.TaskDetailFragmentTest.activeTasks_displayedInUi(TaskDetailFragmentTest.kt:35)Tests ran to completion.

These are the dependencies that I’m using

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Have been looking for an answer online but I have not come to any useful finding.

What could I be missing?

Solution

You should check the Roboelectric Dependency and ensure it is testImplementation

In my case I was using this version

implementation "org.robolectric:robolectric:4.5.1

The error was gone when I switched to test implementation.

testImplementation "org.robolectric:robolectric:4.5.1"

Answered By – Tonnie

Answer Checked By – David Goodson (Easybugfix Volunteer)

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