Dart Question
Can I make a custom matcher for Flutter unit or integration tests?
I'm writing a unit or integration test for mobile. Can I make a custom matcher?
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Answer Source
Yes, you can create custom Matcher classes and custom Finder classes.
Here's one of Flutter's custom matchers that asserts that the given Finder finds a widget that's inside a Card widget:
class _IsInCard extends Matcher {
const _IsInCard();
@override
bool matches(covariant Finder finder, Map<dynamic, dynamic> matchState) => _hasAncestorOfType(finder, Card);
@override
Description describe(Description description) => description.add('in card');
}
The Matcher class is not part of the Flutter framework. It is defined in package:mathcer. Flutter inherits it from package:test. All Flutter's own Matcher classes are custom implementations of it.
Flutter's test framework has lots of custom matchers and custom finders you can learn from.
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