byKey method Null safety
Finds widgets by searching for one with a particular Key.
Sample code
expect(find.byKey(backKey), findsOneWidget);
If the skipOffstage
argument is true (the default), then this skips
nodes that are Offstage or that are from inactive Routes.
Implementation
Finder byKey(Key key, { bool skipOffstage = true }) => _KeyFinder(key, skipOffstage: skipOffstage);