Android Compose: testing button click

I’m learning how to write a Compose test. The goal: is to show basic test to click a button. Series will show run Compose test using Firebase Test Lab.

1. Using Android Studio Chipmunk create a new Android project “Compose Activity”. Add below snippet to your MainActivity

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContent {
            val context = LocalContext.current

            ComposeUITestTheme {
                Box(
                    contentAlignment = Alignment.Center,
                    modifier = Modifier
                        .fillMaxWidth()
                        .fillMaxHeight()
                        .background(Color.White)
                ) {
                    Button(
                        onClick = {
                            Toast.makeText(context, "Hello world", Toast.LENGTH_SHORT).show()
                        },
                        modifier = Modifier.testTag("yourTestTag")
                    ) {
                        Text(text = stringResource(R.string.click))
                    }
                }
            }
        }
    }
}

2. The new project already comes with the Gradle dependencies for Compose UI testing

androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version"

debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version"