MyComposableTest.kt

internal class MyComposableTest {

    @get:Rule
    val composeTestRule = createComposeRule()

    @Test
    fun test_TitleIsShownWhenLoaded() {
        initComposable(state = MyState.Loaded)
        composeTestRule.onNodeWithText("Title").assertIsDisplayed()
    }

    @Test
    fun test_TitleIsNotShownWhenError() {
        initComposable(state = MyState.Error)
        composeTestRule.onNodeWithText("Title").assertIsNotDisplayed()
    }

    private fun initComposable(state: MyState) {
        composeTestRule.setContent {
            MyTheme {
                MyComposable(state = state)
            }
        }
    }
}