'Ignore firebase related exceptions in Roboelectric unit test

My Roboelectric unit tests are giving this exception when I try to initialise Firebase in the Application class.

java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process null. Make sure to call FirebaseApp.initializeApp(Context) first.

Is there any way where I can ignore this exceptions and get my tests pass?

androidunit-testingrobolectric


Solution 1:[1]

If you do not need firebase in your test, you can annotate the test class with

@RunWith(RobolectricTestRunner.class)
@Config(application = Application.class)

to use a different application from your app custom application.

Solution 2:[2]

As an option you can use mockStatic from mockito:

mockStatic(FirebaseFirestore::class.java)
    .use { firebaseFirestore ->
        firebaseFirestore.`when`<Any> { FirebaseFirestore.getInstance() }.thenReturn(mock(FirebaseFirestore::class.java))
}

Solution 3:[3]

Organize your code so that it isn't reliant on a Firebase connection and pass in a mock? Its generally not a good idea to have unit tests rely on a remote service, that's more the realm of integration tests or acceptance tests.

Or alternatively- do the initialization in an @Before if that's too hard?

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Makibo
Solution 2 walkmn
Solution 3 Gabe Sechan

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