How to test Jetpack Compose - Layout

JCTestingLayout.kt

@Composable
fun MainScreen() {
    Box(
        contentAlignment = Alignment.Center,
        modifier = Modifier
            .fillMaxWidth()
            .fillMaxHeight()
            .background(Color.White)
    ) {
        Button(
            onClick = {...},
            modifier = Modifier.testTag("yourTestTag")
        ) {
            Text(text = stringResource(R.string.click))
        }
    }
}