Hi! I'm struggling with UI tests... I'm trying to get all nodes with a certain content description, ...

# compose-android

[Christophe Dongieux]

Hi! I'm struggling with UI tests...
I'm trying to get all nodes with a certain content description, and I want to check all these nodes are displayed.
I don't know in advance how many nodes there can be, so I can't assert on the count.

composeTestRule
    .onAllNodesWithContentDescription("Foobar")
    .assertAreDisplayed() // <-- I want this kind of function

Any idea?

[Chrimaeon]

1. strange test if you don’t know the expected number of nodes.
2. What is hindering you on using a foreach loop in the nodes?

[Christophe Dongieux]

1. server-driven UI, anything is possible 🤷
2. what do you suggest? AFAIK, there are 2 options to get nodes
a. semantics nodes by doing something like that

composeTestRule
  .onAllNodesWithContentDescription("Foobar")
  .fetchSemanticsNodes()

But I get a List<SemanticsNode>, I don't know what to do with that to call assertIsDisplayed()

b. SemanticsNodeInteractionCollection by doing this

composeTestRule
  .onAllNodesWithContentDescription("Foobar")

But there is nothing interesting I can do with SemanticsNodeInteractionCollection if I don't expect any particular size.

[Chrimaeon]

Ah, okay. But on the collection there is an assertAll that you can pass a matcher. Which in your case will be the isDisplayed

[Christophe Dongieux]

isDisplayed() doesn't seem to exist

[Chrimaeon]

Yeah, it was just a „placeholder“ for a matcher that should exist.

[Christophe Dongieux]

That's the whole problem 😄

[Chrimaeon]

There’s also a fetchSemanticNodes which return the list of nodes that you can definitely assert with `isDisplayed`()

[Christophe Dongieux]

Oh, I just had an idea

private fun SemanticsNodeInteractionCollection.assertAreDisplayed(): SemanticsNodeInteractionCollection {
        val semNodes = fetchSemanticsNodes()
        semNodes.forEachIndexed { index, _ ->
            val semanticsNodeInteraction = get(index)
            semanticsNodeInteraction.assertIsDisplayed()
        }
        return this
    }

It should work, I guess

[Chrimaeon]

👍🏻

[Christophe Dongieux]

Thanks for your help 👍

[Severiano Jaramillo]

Looks like you solved your issue, but I am wondering about this:

server-driven UI, anything is possible 🤷

We use our own flavor of server-driven UI, but tests are still deterministic. The server responses are hardcoded and thus we know the number of elements that a particular test should have. Why is that not the case for you? Are you using a real server for your UI tests? Does your test involve testing for a random number of elements?

[Christophe Dongieux]

What I meant by "anything is possible" is that the server can tell the frontend to display 3 times the same image in different places.
In my tests I'm not able to determine this count, but when I build the UI I will give the same content description to each image, as they are the same.