Hi. I wonder if there is a way to retrieve a semantic object within a test and assert its values.

# compose

[Simon Stahl]

Hi. I wonder if there is a way to retrieve a semantic object within a test and assert its values.

[Simon Stahl]

Say I have a composable with a text like this:

val ItemKey = SemanticsPropertyKey<Item>("Item")
var SemanticsPropertyReceiver.item by ItemKey

data class Item(val id: Int, val name: String)

Text(
    modifier = Modifier.semantics {
        this.testTag = "test"
        this.item = Item(99, "TestXXX")
    },
    text = "My text"
)

And now in my test, I want to retrieve the Item object and assert its values

composeTestRule.onNodeWithTag("test").assert(???, 99)

Anyone has a tip for how to do that?

[Zach Klippenstein (he/him) [MOD]]

https://developer.android.com/jetpack/compose/testing#custom-semantics-properties

[Zach Klippenstein (he/him) [MOD]]

There are other SemanticsMatchers for other things, and you can write your own assertions - just look at how the ones in the stdlib are implemented

[Simon Stahl]

Nice, that's easier than I thought for once 🙂 Thanks for the help, I appreciate it

[Simon Stahl]

For reference if someone else is looking for this. you can create your own assert helper method. for above example it could look like this

fun SemanticsNodeInteraction.assertItem(description: String, check: (Item) -> Boolean) {
    assert(SemanticsMatcher(description) {
        check(it.config[ItemKey])
    })
}

[Simon Stahl]

and then i can write my tests like this

composeTestRule.onNodeWithTag("test").assertItem("Checking id") {
    it.id == 99
}