androidx test: SnackBar error inflate design_layout_snackbar_include.xml

[Leon Lei]

Hi Guys

I had try to write androidx unit test with robolectric + espresso + fragment testing, but it crashed at

https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/snackbar/Snackbar.java#L164

The layout inflated is design_layout_snackbar_include.xml, so I checked the unit test apk, but the layout file was there.

Then I check the crash stack more carefully, and I have found actually it fail at try to resolve R.color.colorAccent.

I dont know how to solve this problem, did this related about SnackBar or android legacy support library issue, or something else?

Very appreciate if someone can help me with this issue.

BRs

[Leon Lei]

dependencies

implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.core:core-ktx:1.1.0'
implementation "com.google.android.material:material:1.0.0"
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

implementation 'androidx.navigation:navigation-fragment-ktx:2.1.0'
implementation 'androidx.navigation:navigation-ui-ktx:2.1.0'

debugImplementation 'androidx.fragment:fragment-testing:1.1.0'

testImplementation 'junit:junit:4.12'
testImplementation 'androidx.test:runner:1.2.0'
testImplementation 'androidx.test.ext:truth:1.2.0'
testImplementation 'androidx.test.ext:junit-ktx:1.1.1'
testImplementation 'androidx.test.ext:truth:1.2.0'
testImplementation 'org.robolectric:robolectric:4.3'
testImplementation 'androidx.test.espresso:espresso-core:3.2.0'
testImplementation 'org.mockito:mockito-core:3.0.0'

androidTestImplementation 'androidx.test.ext:junit-ktx:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test:rules:1.2.0'

My Single test

@RunWith(AndroidJUnit4::class)
@TextLayoutMode(TextLayoutMode.Mode.REALISTIC)
@LooperMode(LooperMode.Mode.PAUSED)
@MediumTest
class CreateTuDouFragmentTest {

    @Test
    fun saveTuDouTask() {
        // GIVEN - launch create tudou fragment
        FragmentScenario.launchInContainer(CreateTuDouFragment::class.java).apply {
            onFragment {
                Navigation.setViewNavController(it.view!!, mock(NavController::class.java))
            }
        }

        // WHEN - user input valid information and save
        onView(withId(R.id.tudou_name)).perform(replaceText("title"), closeSoftKeyboard())
        onView(withId(R.id.tudou_content)).perform(replaceText("content"), closeSoftKeyboard())
        onView(withId(R.id.done_input)).perform(click())

        // THEN - we can retrieve task from repo
        onSnackBar("Saved").check(matches(isDisplayed()))
    }
}

When click done_input, 

viewModel.snarkBarText.observe(this, Observer { msg ->
    view?.let {
        Snackbar.make(it, msg, Snackbar.LENGTH_SHORT).show()
        println("saved")
    }
})

Crash stack

Caused by: java.lang.UnsupportedOperationException: Failed to resolve attribute at index 5: TypedValue{t=0x2/d=0x7f03008a a=-1}
at android.content.res.TypedArray.getColorStateList(TypedArray.java:546)
at android.widget.TextView.readTextAppearance(TextView.java:3542)
at android.widget.TextView.__constructor__(TextView.java:959)
at android.widget.TextView.<init>(TextView.java)
at android.widget.Button.<init>(Button.java)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:720)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:788)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at com.google.android.material.snackbar.Snackbar.make(Snackbar.java:188)

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