Check if the button is displayed on the screen and on click of it the proper message is displayed on snack bar

Code

@SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
@Composable
fun DemoSnackBar() {

    val snackBarHostState = remember { SnackbarHostState() }
    val coroutineScope = rememberCoroutineScope()

    Scaffold(content = {
        Column(
            modifier = Modifier.fillMaxSize(),
            verticalArrangement = Arrangement.Center,
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Button(onClick = {

                coroutineScope.launch {
                    // Launch the snack-bar in the co-routine
                    val snackBarResult = snackBarHostState.showSnackbar(
                        message = "SnackBarDemo",
                        actionLabel = "Undo",
                        duration = SnackbarDuration.Short
                    )
                    when (snackBarResult) {
                        SnackbarResult.ActionPerformed -> {
                            Log.d("Snackbar", "Action Performed")
                        }

                        else -> {
                            Log.d("Snackbar", "Snackbar dismissed")
                        }
                    }
                }

            }) {
                Text(text = "Show Snack Bar", color = Color.White)
            }
        }
    }, snackbarHost = { SnackbarHost(hostState = snackBarHostState) })
}

Test Class

class SnackbarDemoTest {

    @get:Rule
    val composeTestRule = createComposeRule()


    @Test
    fun myTest() {
        // <------------------------ ASSIGN ------------------------>
        val buttonText = "Show Snack Bar"
        val snackBarText = "SnackBarDemo"

        composeTestRule.setContent {
            DemoSnackBar()
        }

        // <------------------------ ACT -------------------------->
        composeTestRule.onNodeWithText(buttonText).performClick()
        composeTestRule.onNodeWithText(snackBarText).isDisplayed()
    }


}