Writing UI Tests for Jetpack Compose Navigation
How to ensure ‘Navigation in Compose’ works as expected?
There is a separate story written about How to add Navigation Component in Compose. In this story we will extend it further to add UI Tests making sure navigation logic works as expected.
You can get the project from here and go through it
Testability
To make code testable, we decoupled Navigation logic from Composable/s which enables testability of composable functions separate from NavHost Testing because we don’t need to pass navController in composable functions rather composable functions are exposing a lambda which will be called upon navigation.
Dependency
androidTestImplementation "androidx.navigation:navigation-testing:2.5.3"Test Tag: Modifier.testTag
To test composable functions, we should add a test tag for the ui component we want to test. Test tag is a string that you assign to a composable UI component using Modifier. e,g we added a test tag for Home Screen via modifier as Modifier.testTag(“test_tag_home_screen”).
You will access the UI component using the test tag in our UI Tests and check visibility and clicks on it.
