Compose HorizontalPager scrollToPage 的 Android UI 测试

Question

我正在使用 HorizontalPager，它显示一个跳过选项以滚动到最后一页。

val pagerState = rememberPagerState()
val coroutineScope = rememberCoroutineScope()

ConstraintView {

    val (skipText, pager) = createRefs()

    ....
    
        Text(
            text = stringResource(id = R.string.skip),
                modifier = Modifier
                    .constrainAs(skipText) {
                        ....
                    }
                    .clickable {
                        coroutineScope.launch {
                            pagerState.scrollToPage(page = pageCount - 1)
                        }
                    }
            )
    ....
}

因为这是按预期工作的，所以我正在为这个用例编写 composeTest。

@get:Rule
val composeTestRule = createComposeRule()

@Before
fun setup() {
    composeTestRule.setContent {
        content()
    }
}

@Test
fun testOnClickSkipNavigateToLastPageInNodeTree() = {
    composeTestRule.apply {
        onNodeWithText("First Page").assertIsDisplayed() // Text displayed in first page
        onNodeWithText("Skip").assertIsDisplayed()
        onNodeWithText("Skip").performClick()
        
        // Printing the nodes
        onAllNodesWithTag("Skip").fetchSemanticsNodes().isEmpty()
        
        onNodeWithText("Last Page").assertIsDisplayed() // Text displayed in last page

但是上面的代码失败并报错，

java.lang.AssertionError: Failed to perform isDisplayed check.
Reason: Expected exactly '1' node but could not find any node that satisfies: (Text + EditableText contains 'Last Page' (ignoreCase: false))

我认为这是因为

coroutineScope

。我尝试了几个我知道的选项，例如

waitUntil

、

waitUntilExists

甚至

Thread.sleep

跳过文本。但它仍然失败。我怀疑

Coroutines

并且无法找到解决方法。

打印节点结果，

Node #1 at (l=0.0, t=279.0, r=1080.0, b=2141.0)px
|-Node #2 at (l=0.0, t=279.0, r=1080.0, b=2141.0)px
    DesignInfoProvider = 'androidx.constraintlayout.compose.Measurer@96f3373'
        |-Node #4 at (l=909.0, t=279.0, r=1080.0, b=419.0)px
        | Focused = 'false'
        | Text = '[Skip]'
        | Actions = [OnClick, RequestFocus, GetTextLayoutResult]
        | MergeDescendants = 'true'
        |-Node #5 at (l=0.0, t=349.0, r=1080.0, b=2211.0)px
            HorizontalScrollAxisRange = 'ScrollAxisRange(value=0.0, maxValue=4.0, reverseScrolling=false)'
            CollectionInfo = 'androidx.compose.ui.semantics.CollectionInfo@3f82230'
            Actions = [IndexForKey, ScrollBy, ScrollToIndex]
                    |-Node #12 at (l=225.0, t=1069.0, r=856.0, b=1209.0)px
                    | Text = ‘[First Page]’
                    | Actions = [GetTextLayoutResult]

正如人们所看到的，它打印出

First Page

，但我希望它打印出

Last Page

。任何帮助表示赞赏。谢谢