Finds Text widgets containing string equal to the text
argument.
Example:
expect(tester, hasWidget(find.text('Back')));
If the skipOffstage argument is true (the default), then this skips
nodes that are Offstage or that are from inactive Routes.
Source
Finder text(String text, { bool skipOffstage: true }) => new _TextFinder(text, skipOffstage: skipOffstage);