filterToOne
Returns a lazy handle to the single match that also satisfies matcher; it fails on use when the filtered set does not hold exactly one node.
onAllNodesOfType<JCheckBox>().filterToOne(SwingMatcher.isSelected()).assertExists()Content copied to clipboard
Return
a handle that fails on use unless exactly one match survives.
Parameters
matcher
must leave exactly one match; it is applied on each use, so which node survives can change across recomposition.