IssueTracker

I was unable to assert state change during unit test using espresso view matchers like so:

  @Test
  fun someTest() {
    composeRule.setContent {
      SomeComposable()
    }

    onView(withText(MY_TEXT)).check(matches(withEffectiveVisibility(VISIBLE)))
  }

where SomeComposable contains an AndroidView composable that has an update block depending on a state created inside the composable.

Example of when it doesn't work in unit test -- creating the state where the composable wraps around the AndroidView()

  @Composable
  fun SomeComposable(
    messageId: String,
  ) {
    val title by CreatesSomeState(messageId)
    AndroidView(
      factory = { context -> ...},
      update = { view ->
        view.apply {
          text = title
          ...
        }
      }
    )
   }

Example of when it does work -- pushing the state delegation to another composable and having the AndroidView-wrapping Composable only accept the final string returned from state

@Composable
fun AHigherLevelComposable(messageId: String) {
   val title by CreatesSomeState(messageId)
  SomeComposable(title)
}

@Composable
  fun SomeComposable(
    title: String,
  ) {
    AndroidView(
      factory = { context -> ...},
      update = { view ->
        view.apply {
          text = title
          ...
        }
      }
    )
  }