Chapter 10, SimpleButtonDemo Test Failed

[BurningDroid]

testLetterAfterButtonClickIsB() test doesn't success.
It failed with below error log:

java.lang.AssertionError: Failed to assert the following: (Text + EditableText contains 'B' (ignoreCase: false))
The node is no longer in the tree, last known semantics:
Node #8 at (l=457.0, t=1075.0, r=624.0, b=1188.0)px
Role = 'Button'
Focused = 'false'
Text = '[A]'
Actions = [OnClick, RequestFocus, GetTextLayoutResult]
MergeDescendants = 'true'
Original selector: Text + EditableText contains 'A' (ignoreCase: false)

[tkuenneth]

Hello. Thanks for opening this issue. I will have a look and return shortly.

[tkuenneth]

Sincere apologies for taking so much time on this. Here is the fixed test case:

@Test
fun testLetterAfterButtonClickIsB() {
    rule.onNodeWithText("A")
        .performClick()
    rule.onNode(matcher = hasClickAction())
        .assert(hasText("B"))
}

My understanding is that in recent Compose versions the semantics tree may be more often updated. Allow me explain: the first version of my test case reused the node it found, even after the button was clicked (and therefore the button text changed). It seems that now (recent Compose versions) the new (changed) button text is represented by another node. Deep inside the stack trace you can find a hint mentioning that the node is no longer present. That's why I find it again, and this should fix the test case

[adolfobulfoni-tomtom]

hi, for anyone that saw @tkuenneth message late 😓 i created a alternative solution:

    @Test
    fun testLetterAfterButtonClickIsB() {
        val buttonUnderTest = rule.onNodeWithTag(TAG1)
        buttonUnderTest.assertTextEquals("A")
        buttonUnderTest.performClick()
        buttonUnderTest.assertTextEquals("B")
    }

and add modifier = Modifier.testTag(TAG1), to the button in main class.
I prefer this solution because proposed one won't work in case more nodes have click actions.