launchFragmentInContainer unable to resolve Activity in Android

Question

While writing a simple test which uses launchFragmentInContainer, I get the following error message:

java.lang.RuntimeException: Unable to resolve activity for: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.myapp.appname.debug/androidx.fragment.app.testing.FragmentScenario$EmptyFragmentActivity (has extras) }

The basic test class is:

class OneFragmentTest {

    @Test
    fun testOneFragmentState_checkTitleText() {
        val args = Bundle().apply {
            putString("dummyKey", "dummyValue")
        }
        launchFragmentInContainer<OneFragment>(args)

        onView(withId(R.id.tv_title)).check(matches(withText("title here")))
    }
}

I have tried to update AndroidManifest.xml with the following:

<instrumentation
        android:name="android.test.InstrumentationTestRunner"
        android:targetPackage="com.myapp.appname" />

but it seems that the tag instrumentation is valid but the values are written in red, so I assume something is wrong with the targetPackage and name.

How can I get rid of this error and run a simple test on OneFragment using launchFragmentInContainer?

Answer 1

The error was related to the way I did import the dependencies on Gradle.

Before:

androidTestImplementation("androidx.fragment:fragment-testing:1.1.0-beta01")
implementation("androidx.fragment:fragment-ktx:1.1.0-beta01")
androidTestImplementation("androidx.test:core:1.2.0")
androidTestImplementation("androidx.test:rules:1.2.0")
androidTestImplementation("androidx.test:runner:1.2.0")

After:

debugImplementation("androidx.fragment:fragment-testing:1.1.0-beta01")
debugImplementation("androidx.fragment:fragment-ktx:1.1.0-beta01")
debugImplementation("androidx.test:core:1.2.0")
debugImplementation("androidx.test:rules:1.2.0")
debugImplementation("androidx.test:runner:1.2.0")

Changed from androidTestImplementation to debugImplementation and it solved the issue. Compiling and running, and green test as result.