The matching widget in the widget tree.
Throws a StateError if finder is empty or matches more than
one widget.
- Use firstWidget if you expect to match several widgets but only want the first.
- Use widgetList if you expect to match several widgets and want all of them.
Source
Widget/*=T*/ widget/*<T extends Widget>*/(Finder finder) {
TestAsyncUtils.guardSync();
return finder.evaluate().single.widget;
}