mocktail 1.0.3 mocktail: ^1.0.3 copied to clipboard
A Dart mock library which simplifies mocking with null safety support and no manual mocks or code generation.
import 'package:mocktail/mocktail.dart';
import 'package:test/test.dart';
class Food {}
class Chicken extends Food {}
class Tuna extends Food {}
// A Real Cat class
class Cat {
String sound() => 'meow!';
bool likes(String food, {bool isHungry = false}) => false;
void eat<T extends Food>(T food) {}
final int lives = 9;
}
// A Mock Cat class
class MockCat extends Mock implements Cat {}
void main() {
group('Cat', () {
setUpAll(() {
// Register fallback values when using
// `any` or `captureAny` with custom objects.
registerFallbackValue(Chicken());
registerFallbackValue(Tuna());
});
late Cat cat;
setUp(() {
cat = MockCat();
});
test('example', () {
// Stub a method before interacting with the mock.
when(() => cat.sound()).thenReturn('purr');
// Interact with the mock.
expect(cat.sound(), 'purr');
// Verify the interaction.
verify(() => cat.sound()).called(1);
// Stub a method with parameters
when(
() => cat.likes('fish', isHungry: any(named: 'isHungry')),
).thenReturn(true);
expect(cat.likes('fish', isHungry: true), isTrue);
// Verify the interaction.
verify(() => cat.likes('fish', isHungry: true)).called(1);
// Interact with the mock.
cat
..eat(Chicken())
..eat(Tuna());
// Verify the interaction with specific type arguments.
verify(() => cat.eat<Chicken>(any())).called(1);
verify(() => cat.eat<Tuna>(any())).called(1);
verifyNever(() => cat.eat<Food>(any()));
});
});
}