Instrumentation tests can't find node tagged with string for test in Android

Question

I'm trying to test a composable using .testTag that sits at the leaf level of the tree given the Composables call structure. The code is in the style of:

Top level Composable

@Composable
fun TopLevelComposable() {
    AComposable()
}

Child composable

@Composable
fun AComposable() {
    LeafComposable()
}

Leaf Composable

@Composable
fun LeafComposable() {
    Text(text = "stringOfText", modifier = Modifier.testTag("Text of AComposable"))
}

MainActivity.kt

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyTheme {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {
                    TopLevelComposable()
            }
        }
    }
}

Though, I get an error:

java.lang.AssertionError: Failed: assertExists.
Reason: Expected exactly '1' node but could not find any node that satisfies: (TestTag = 'Text of AComposable')
However, the unmerged tree contains '1' node that matches. Are you missing `useUnmergedNode = true` in your finder?

Question

How can I enable androidTest to accept nested .testTag using Composables?

dugsmith · Accepted Answer · 2024-11-06 22:56:30Z

1

I don't see where you're calling .assertExists() in your example, but the error message has a helpful suggestion. In your instrumented test, add useUnmergedTree = true like so:

    composeTestRule.onNodeWithTag("Text of AComposable", useUnmergedTree = true)
        .assertExists()
        .assertIsDisplayed()

answered Nov 6, 2024 at 22:56

dugsmith

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Instrumentation tests can't find node tagged with string for test in Android

Top level Composable

Child composable

Leaf Composable

MainActivity.kt

Question

1 Answer 1

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Your Answer

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Collectives™ on Stack Overflow

Top level Composable

Child composable

Leaf Composable

MainActivity.kt

Question

1 Answer 1

Comments

Your Answer

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