widget_test_harness 0.4.4

Create a reusable harness for testing. Use Mixins to combine functionality to keep testing dependencies dry

Test Harness

A package to help with the creation of test harnesses to allow better readability and composability of tests

Uses Given, When, then, but unlike a lot of other test frameworks there is a single callback.

based on the ebay given_when_then but improves the ability to use add mixins to have tests automatically configure themselves.

Installation 💻

Add test_harness to your pubspec.yaml:

dev_dependencies:
  widget_test_harness: 0.3.0

Install it:

flutter packages get

Usage

Without given_when_then

void main() {
  testWidgets('MyWidget has a title and message', (tester) async {
    await tester.pumpWidget(const MyWidget(title: 'T', message: 'M'));
    final titleFinder = find.text('T');
    final messageFinder = find.text('M');

    // Use the `findsOneWidget` matcher provided by flutter_test to verify
    // that the Text widgets appear exactly once in the widget tree.
    expect(titleFinder, findsOneWidget);
    expect(messageFinder, findsOneWidget);
  });
}

Minimal change with given_when_then

void main() {
  testWidgets('MyWidget has a title and message', harness((given, when, then) async {
    await given.pumpMyWidget(title: 'T', message: 'M');
    final titleFinder = find.text('T');
    final messageFinder = find.text('M');

    then.findsOneWidget(titleFinder);
    then.findsOneWidget(messageFinder);
  }));
}

-- see example_test.dart for example of usage