SwitchLayoutKtTest.kt

class SwitchLayoutKtTest {
    // Create test rule, we need android context so we use createAndroidComposeRule factory method
    @get:Rule
    val composeTestRule = createAndroidComposeRule<ComponentActivity>()

    @Test
    fun testButtonOn_setsOnState() {
        val context = composeTestRule.activity
        val onButtonNodeIdentifier = context.getString(R.string.on_button_description)
        val currentStatusNodeIdentifier = context.getString(R.string.current_status_description)
        // Start the app
        composeTestRule.setContent {
            SemanticsTestingPlaygroundTheme {
                SwitchLayout()
            }
        }
        // Perform click action on "on button", using its semantics matcher
        composeTestRule.onNodeWithContentDescription(onButtonNodeIdentifier).performClick()
        // Assert status text switches to "on status"
        composeTestRule.onNodeWithContentDescription(currentStatusNodeIdentifier)
            .assertTextEquals("Status is: ${SwitchStatus.ON.name}")
    }