tester method

void tester({ required String name, required NullaryAsync<T> example, })

run test providing a description and an example function

Implementation

void tester({
  required String name,
  required NullaryAsync<T> example,
}) {
  group('test for $name', () {
    final tester = Stub.nullary<Future<T>>();

    setUp(tester.reset);

    test(
        'GIVEN $name original function does not throw '
        'WHEN $name.call '
        'THEN return Success', () {
      tester.stub = example;

      expectLater(
        tester(),
        isA<Result<T>>(),
        reason: 'tester should not throw',
      );
    });

    test(
        'GIVEN $name original function throws Exception '
        'WHEN $name.call '
        'THEN return Failure', () {
      tester.stub = () => throw Exception();

      expect(
        tester(),
        isA<Failure<T>>(),
        reason: 'tester should throw',
      );
    });

    test(
        'GIVEN $name original function throws Error '
        'WHEN $name.call '
        'THEN return Failure', () {
      tester.stub = () => throw Error();

      expect(
        tester(),
        isA<Failure<T>>(),
        reason: 'tester should throw',
      );
    });
  });
}