onChild
Function
Common
@CheckResult
fun SemanticsNodeInteraction.onChild(): SemanticsNodeInteraction
Returns exactly one child of this node.
Use this only if this node has exactly one child.
Any subsequent operation on its result will expect exactly one element found (unless
SemanticsNodeInteraction.assertDoesNotExist is used) and will throw AssertionError if none or
more than one element is found.
