Error inflating class com.google.android.material.tabs.TabLayout inside FragmentScenario test

Issue

I wrote a test using FragmentScenario:

@Test
    fun test() {
        launchFragmentInContainer<MyFragment>(Bundle().apply { putParcelableArray(MY_DATA, getMyData()) })
        // checks here
    }

And I get following error:

Error inflating class com.google.android.material.tabs.TabLayout

And I get the error only when I launch my test (the app works) I tried to add androidTestImplementation "com.google.android.material:material:1.0.0" to androidTestImplementation but it didn't help

What can I do to fix that?

Solution

The default theme for the activity FragmentScenario launches has a parent theme of android:Theme.WithActionBar - not the MaterialComponents theme that TabLayout requires.

You should pass in the theme that you want to use.

For example, assuming your app has a theme declared as such:

<style name="AppTheme" parent="Theme.MaterialComponents">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

You'd use:

launchFragmentInContainer<MyFragment>(
    Bundle().apply { putParcelableArray(MY_DATA, getMyData()) },
    R.style.AppTheme)

Answered By - ianhanniballake