test/mockito_test.dart - mockito - Git at Google

 // Copyright 2016 Dart Mockito authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 // http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 import 'package:mockito/mockito.dart';
 import 'package:test/test.dart';

 class _RealClass {
   _RealClass? innerObj;
   String? methodWithoutArgs() => 'Real';
   String? methodWithNormalArgs(int? x) => 'Real';
   String? methodWithListArgs(List<int?>? x) => 'Real';
   String? methodWithPositionalArgs(int? x, [int? y]) => 'Real';
   String? methodWithNamedArgs(int? x, {int? y}) => 'Real';
   String? methodWithTwoNamedArgs(int? x, {int? y, int? z}) => 'Real';
   String? methodWithObjArgs(_RealClass x) => 'Real';
   Future<String>? methodReturningFuture() => Future.value('Real');
   Stream<String>? methodReturningStream() => Stream.fromIterable(['Real']);
   String? get getter => 'Real';
 }

 abstract class _Foo {
   String? bar();
 }

 abstract class _AbstractFoo implements _Foo {
   @override
   String? bar() => baz();

   String? baz();

   String quux() => 'Real';
 }

 class _MockFoo extends _AbstractFoo with Mock {}

 class _MockedClass extends Mock implements _RealClass {}

 void expectFail(String expectedMessage, void Function() expectedToFail) {
   try {
     expectedToFail();
     fail('It was expected to fail!');
   } catch (e) {
     if (e is! TestFailure) {
       rethrow;
     } else {
       if (expectedMessage != e.message) {
         throw TestFailure('Failed, but with wrong message: ${e.message}');
       }
     }
   }
 }

 void main() {
   late _MockedClass mock;

   setUp(() {
     mock = _MockedClass();
   });

   tearDown(() {
     // In some of the tests that expect an Error to be thrown, Mockito's
     // global state can become invalid. Reset it.
     resetMockitoState();
   });

   group('mixin support', () {
     test('should work', () {
       var foo = _MockFoo();
       when(foo.baz()).thenReturn('baz');
       expect(foo.bar(), 'baz');
     });
   });

   group('when()', () {
     test('should mock method without args', () {
       when(mock.methodWithoutArgs()).thenReturn('A');
       expect(mock.methodWithoutArgs(), equals('A'));
     });

     test('should mock method with normal args', () {
       when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
       expect(mock.methodWithNormalArgs(43), isNull);
       expect(mock.methodWithNormalArgs(42), equals('Ultimate Answer'));
     });

     test('should mock method with mock args', () {
       var m1 = _MockedClass();
       when(mock.methodWithObjArgs(m1)).thenReturn('Ultimate Answer');
       expect(mock.methodWithObjArgs(_MockedClass()), isNull);
       expect(mock.methodWithObjArgs(m1), equals('Ultimate Answer'));
     });

     test('should mock method with positional args', () {
       when(mock.methodWithPositionalArgs(42, 17)).thenReturn('Answer and...');
       expect(mock.methodWithPositionalArgs(42), isNull);
       expect(mock.methodWithPositionalArgs(42, 18), isNull);
       expect(mock.methodWithPositionalArgs(42, 17), equals('Answer and...'));
     });

     test('should mock method with named args', () {
       when(mock.methodWithNamedArgs(42, y: 17)).thenReturn('Why answer?');
       expect(mock.methodWithNamedArgs(42), isNull);
       expect(mock.methodWithNamedArgs(42, y: 18), isNull);
       expect(mock.methodWithNamedArgs(42, y: 17), equals('Why answer?'));
     });

     test('should mock method with List args', () {
       when(mock.methodWithListArgs([42])).thenReturn('Ultimate answer');
       expect(mock.methodWithListArgs([43]), isNull);
       expect(mock.methodWithListArgs([42]), equals('Ultimate answer'));
     });

     test('should mock method with argument matcher', () {
       when(mock.methodWithNormalArgs(argThat(greaterThan(100))))
           .thenReturn('A lot!');
       expect(mock.methodWithNormalArgs(100), isNull);
       expect(mock.methodWithNormalArgs(101), equals('A lot!'));
     });

     test('should mock method with any argument matcher', () {
       when(mock.methodWithNormalArgs(any)).thenReturn('A lot!');
       expect(mock.methodWithNormalArgs(100), equals('A lot!'));
       expect(mock.methodWithNormalArgs(101), equals('A lot!'));
     });

     test('should mock method with any list argument matcher', () {
       when(mock.methodWithListArgs(any)).thenReturn('A lot!');
       expect(mock.methodWithListArgs([42]), equals('A lot!'));
       expect(mock.methodWithListArgs([43]), equals('A lot!'));
     });

     test('should mock method with multiple named args and matchers', () {
       when(mock.methodWithTwoNamedArgs(any, y: anyNamed('y')))
           .thenReturn('x y');
       when(mock.methodWithTwoNamedArgs(any, z: anyNamed('z')))
           .thenReturn('x z');
       expect(mock.methodWithTwoNamedArgs(42), 'x z');
       expect(mock.methodWithTwoNamedArgs(42, y: 18), equals('x y'));
       expect(mock.methodWithTwoNamedArgs(42, z: 17), equals('x z'));
       expect(mock.methodWithTwoNamedArgs(42, y: 18, z: 17), isNull);
       when(mock.methodWithTwoNamedArgs(any, y: anyNamed('y'), z: anyNamed('z')))
           .thenReturn('x y z');
       expect(mock.methodWithTwoNamedArgs(42, y: 18, z: 17), equals('x y z'));
     });

     test('should mock method with mix of argument matchers and real things',
         () {
       when(mock.methodWithPositionalArgs(argThat(greaterThan(100)), 17))
           .thenReturn('A lot with 17');
       expect(mock.methodWithPositionalArgs(100, 17), isNull);
       expect(mock.methodWithPositionalArgs(101, 18), isNull);
       expect(mock.methodWithPositionalArgs(101, 17), equals('A lot with 17'));
     });

     test('should mock getter', () {
       when(mock.getter).thenReturn('A');
       expect(mock.getter, equals('A'));
     });

     test('should have hashCode when it is not mocked', () {
       expect(mock.hashCode, isNotNull);
     });

     test('should have default toString when it is not mocked', () {
       expect(mock.toString(), equals('_MockedClass'));
     });

     test('should use identical equality between it is not mocked', () {
       var anotherMock = _MockedClass();
       expect(mock == anotherMock, isFalse);
       expect(mock == mock, isTrue);
     });

     test('should mock method with thrown result', () {
       when(mock.methodWithNormalArgs(any)).thenThrow(StateError('Boo'));
       expect(() => mock.methodWithNormalArgs(42), throwsStateError);
     });

     test('should mock method with calculated result', () {
       when(mock.methodWithNormalArgs(any)).thenAnswer(
           (Invocation inv) => inv.positionalArguments[0].toString());
       expect(mock.methodWithNormalArgs(43), equals('43'));
       expect(mock.methodWithNormalArgs(42), equals('42'));
     });

     test('should return mock to make simple oneline mocks', () {
       _RealClass mockWithSetup = _MockedClass();
       when(mockWithSetup.methodWithoutArgs()).thenReturn('oneline');
       expect(mockWithSetup.methodWithoutArgs(), equals('oneline'));
     });

     test('should use latest matching when definition', () {
       when(mock.methodWithoutArgs()).thenReturn('A');
       when(mock.methodWithoutArgs()).thenReturn('B');
       expect(mock.methodWithoutArgs(), equals('B'));
     });

     test('should mock method with calculated result', () {
       when(mock.methodWithNormalArgs(argThat(equals(43)))).thenReturn('43');
       when(mock.methodWithNormalArgs(argThat(equals(42)))).thenReturn('42');
       expect(mock.methodWithNormalArgs(43), equals('43'));
     });

     // Error path tests.
     test('should throw if `when` is called while stubbing', () {
       expect(() {
         var responseHelper = () {
           var mock2 = _MockedClass();
           when(mock2.getter).thenReturn('A');
           return mock2;
         };
         when(mock.innerObj).thenReturn(responseHelper());
       }, throwsStateError);
     });

     test('thenReturn throws if provided Future', () {
       expect(
           () => when(mock.methodReturningFuture())
               .thenReturn(Future.value('stub')),
           throwsArgumentError);
     });

     test('thenReturn throws if provided Stream', () {
       expect(
           () => when(mock.methodReturningStream())
               .thenReturn(Stream.fromIterable(['stub'])),
           throwsArgumentError);
     });

     test('thenAnswer supports stubbing method returning a Future', () async {
       when(mock.methodReturningFuture())
           .thenAnswer((_) => Future.value('stub'));

       expect(await mock.methodReturningFuture(), 'stub');
     });

     test('thenAnswer supports stubbing method returning a Stream', () async {
       when(mock.methodReturningStream())
           .thenAnswer((_) => Stream.fromIterable(['stub']));

       expect(await mock.methodReturningStream()?.toList(), ['stub']);
     });

     test('should throw if named matcher is passed as the wrong name', () {
       expect(() {
         when(mock.methodWithNamedArgs(argThat(equals(42)), y: anyNamed('z')))
             .thenReturn('99');
       }, throwsArgumentError);
     });

     test('should throw if attempting to stub a real method', () {
       var foo = _MockFoo();
       expect(() {
         when(foo.quux()).thenReturn('Stub');
       }, throwsStateError);
     });
   });

   group('throwOnMissingStub', () {
     test('should throw when a mock was called without a matching stub', () {
       throwOnMissingStub(mock);
       when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
       expect(
         () => mock.methodWithoutArgs(),
         throwsA(TypeMatcher<MissingStubError>()),
       );
     });

     test('should not throw when a mock was called with a matching stub', () {
       throwOnMissingStub(mock);
       when(mock.methodWithoutArgs()).thenReturn('A');
       expect(() => mock.methodWithoutArgs(), returnsNormally);
     });

     test(
         'should throw the exception when a mock was called without a matching'
         'stub and an exception builder is set.', () {
       throwOnMissingStub(mock, exceptionBuilder: (_) {
         throw Exception('test message');
       });
       when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
       expect(() => mock.methodWithoutArgs(), throwsException);
     });
   });

   test(
       'reports an error when using an argument matcher outside of stubbing or '
       'verification', () {
     expect(() => mock.methodWithNormalArgs(any), throwsArgumentError);
   });

   test(
       'reports an error when using an argument matcher in a position other '
       'than an argument for the stubbed method', () {
     expect(() => when(mock.methodWithListArgs(List.filled(7, any))),
         throwsArgumentError);
   });
 }
	// Copyright 2016 Dart Mockito authors
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	import 'package:mockito/mockito.dart';
	import 'package:test/test.dart';

	class _RealClass {
	_RealClass? innerObj;
	String? methodWithoutArgs() => 'Real';
	String? methodWithNormalArgs(int? x) => 'Real';
	String? methodWithListArgs(List<int?>? x) => 'Real';
	String? methodWithPositionalArgs(int? x, [int? y]) => 'Real';
	String? methodWithNamedArgs(int? x, {int? y}) => 'Real';
	String? methodWithTwoNamedArgs(int? x, {int? y, int? z}) => 'Real';
	String? methodWithObjArgs(_RealClass x) => 'Real';
	Future<String>? methodReturningFuture() => Future.value('Real');
	Stream<String>? methodReturningStream() => Stream.fromIterable(['Real']);
	String? get getter => 'Real';
	}

	abstract class _Foo {
	String? bar();
	}

	abstract class _AbstractFoo implements _Foo {
	@override
	String? bar() => baz();

	String? baz();

	String quux() => 'Real';
	}

	class _MockFoo extends _AbstractFoo with Mock {}

	class _MockedClass extends Mock implements _RealClass {}

	void expectFail(String expectedMessage, void Function() expectedToFail) {
	try {
	expectedToFail();
	fail('It was expected to fail!');
	} catch (e) {
	if (e is! TestFailure) {
	rethrow;
	} else {
	if (expectedMessage != e.message) {
	throw TestFailure('Failed, but with wrong message: ${e.message}');
	}
	}
	}
	}

	void main() {
	late _MockedClass mock;

	setUp(() {
	mock = _MockedClass();
	});

	tearDown(() {
	// In some of the tests that expect an Error to be thrown, Mockito's
	// global state can become invalid. Reset it.
	resetMockitoState();
	});

	group('mixin support', () {
	test('should work', () {
	var foo = _MockFoo();
	when(foo.baz()).thenReturn('baz');
	expect(foo.bar(), 'baz');
	});
	});

	group('when()', () {
	test('should mock method without args', () {
	when(mock.methodWithoutArgs()).thenReturn('A');
	expect(mock.methodWithoutArgs(), equals('A'));
	});

	test('should mock method with normal args', () {
	when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
	expect(mock.methodWithNormalArgs(43), isNull);
	expect(mock.methodWithNormalArgs(42), equals('Ultimate Answer'));
	});

	test('should mock method with mock args', () {
	var m1 = _MockedClass();
	when(mock.methodWithObjArgs(m1)).thenReturn('Ultimate Answer');
	expect(mock.methodWithObjArgs(_MockedClass()), isNull);
	expect(mock.methodWithObjArgs(m1), equals('Ultimate Answer'));
	});

	test('should mock method with positional args', () {
	when(mock.methodWithPositionalArgs(42, 17)).thenReturn('Answer and...');
	expect(mock.methodWithPositionalArgs(42), isNull);
	expect(mock.methodWithPositionalArgs(42, 18), isNull);
	expect(mock.methodWithPositionalArgs(42, 17), equals('Answer and...'));
	});

	test('should mock method with named args', () {
	when(mock.methodWithNamedArgs(42, y: 17)).thenReturn('Why answer?');
	expect(mock.methodWithNamedArgs(42), isNull);
	expect(mock.methodWithNamedArgs(42, y: 18), isNull);
	expect(mock.methodWithNamedArgs(42, y: 17), equals('Why answer?'));
	});

	test('should mock method with List args', () {
	when(mock.methodWithListArgs([42])).thenReturn('Ultimate answer');
	expect(mock.methodWithListArgs([43]), isNull);
	expect(mock.methodWithListArgs([42]), equals('Ultimate answer'));
	});

	test('should mock method with argument matcher', () {
	when(mock.methodWithNormalArgs(argThat(greaterThan(100))))
	.thenReturn('A lot!');
	expect(mock.methodWithNormalArgs(100), isNull);
	expect(mock.methodWithNormalArgs(101), equals('A lot!'));
	});

	test('should mock method with any argument matcher', () {
	when(mock.methodWithNormalArgs(any)).thenReturn('A lot!');
	expect(mock.methodWithNormalArgs(100), equals('A lot!'));
	expect(mock.methodWithNormalArgs(101), equals('A lot!'));
	});

	test('should mock method with any list argument matcher', () {
	when(mock.methodWithListArgs(any)).thenReturn('A lot!');
	expect(mock.methodWithListArgs([42]), equals('A lot!'));
	expect(mock.methodWithListArgs([43]), equals('A lot!'));
	});

	test('should mock method with multiple named args and matchers', () {
	when(mock.methodWithTwoNamedArgs(any, y: anyNamed('y')))
	.thenReturn('x y');
	when(mock.methodWithTwoNamedArgs(any, z: anyNamed('z')))
	.thenReturn('x z');
	expect(mock.methodWithTwoNamedArgs(42), 'x z');
	expect(mock.methodWithTwoNamedArgs(42, y: 18), equals('x y'));
	expect(mock.methodWithTwoNamedArgs(42, z: 17), equals('x z'));
	expect(mock.methodWithTwoNamedArgs(42, y: 18, z: 17), isNull);
	when(mock.methodWithTwoNamedArgs(any, y: anyNamed('y'), z: anyNamed('z')))
	.thenReturn('x y z');
	expect(mock.methodWithTwoNamedArgs(42, y: 18, z: 17), equals('x y z'));
	});

	test('should mock method with mix of argument matchers and real things',
	() {
	when(mock.methodWithPositionalArgs(argThat(greaterThan(100)), 17))
	.thenReturn('A lot with 17');
	expect(mock.methodWithPositionalArgs(100, 17), isNull);
	expect(mock.methodWithPositionalArgs(101, 18), isNull);
	expect(mock.methodWithPositionalArgs(101, 17), equals('A lot with 17'));
	});

	test('should mock getter', () {
	when(mock.getter).thenReturn('A');
	expect(mock.getter, equals('A'));
	});

	test('should have hashCode when it is not mocked', () {
	expect(mock.hashCode, isNotNull);
	});

	test('should have default toString when it is not mocked', () {
	expect(mock.toString(), equals('_MockedClass'));
	});

	test('should use identical equality between it is not mocked', () {
	var anotherMock = _MockedClass();
	expect(mock == anotherMock, isFalse);
	expect(mock == mock, isTrue);
	});

	test('should mock method with thrown result', () {
	when(mock.methodWithNormalArgs(any)).thenThrow(StateError('Boo'));
	expect(() => mock.methodWithNormalArgs(42), throwsStateError);
	});

	test('should mock method with calculated result', () {
	when(mock.methodWithNormalArgs(any)).thenAnswer(
	(Invocation inv) => inv.positionalArguments[0].toString());
	expect(mock.methodWithNormalArgs(43), equals('43'));
	expect(mock.methodWithNormalArgs(42), equals('42'));
	});

	test('should return mock to make simple oneline mocks', () {
	_RealClass mockWithSetup = _MockedClass();
	when(mockWithSetup.methodWithoutArgs()).thenReturn('oneline');
	expect(mockWithSetup.methodWithoutArgs(), equals('oneline'));
	});

	test('should use latest matching when definition', () {
	when(mock.methodWithoutArgs()).thenReturn('A');
	when(mock.methodWithoutArgs()).thenReturn('B');
	expect(mock.methodWithoutArgs(), equals('B'));
	});

	test('should mock method with calculated result', () {
	when(mock.methodWithNormalArgs(argThat(equals(43)))).thenReturn('43');
	when(mock.methodWithNormalArgs(argThat(equals(42)))).thenReturn('42');
	expect(mock.methodWithNormalArgs(43), equals('43'));
	});

	// Error path tests.
	test('should throw if `when` is called while stubbing', () {
	expect(() {
	var responseHelper = () {
	var mock2 = _MockedClass();
	when(mock2.getter).thenReturn('A');
	return mock2;
	};
	when(mock.innerObj).thenReturn(responseHelper());
	}, throwsStateError);
	});

	test('thenReturn throws if provided Future', () {
	expect(
	() => when(mock.methodReturningFuture())
	.thenReturn(Future.value('stub')),
	throwsArgumentError);
	});

	test('thenReturn throws if provided Stream', () {
	expect(
	() => when(mock.methodReturningStream())
	.thenReturn(Stream.fromIterable(['stub'])),
	throwsArgumentError);
	});

	test('thenAnswer supports stubbing method returning a Future', () async {
	when(mock.methodReturningFuture())
	.thenAnswer((_) => Future.value('stub'));

	expect(await mock.methodReturningFuture(), 'stub');
	});

	test('thenAnswer supports stubbing method returning a Stream', () async {
	when(mock.methodReturningStream())
	.thenAnswer((_) => Stream.fromIterable(['stub']));

	expect(await mock.methodReturningStream()?.toList(), ['stub']);
	});

	test('should throw if named matcher is passed as the wrong name', () {
	expect(() {
	when(mock.methodWithNamedArgs(argThat(equals(42)), y: anyNamed('z')))
	.thenReturn('99');
	}, throwsArgumentError);
	});

	test('should throw if attempting to stub a real method', () {
	var foo = _MockFoo();
	expect(() {
	when(foo.quux()).thenReturn('Stub');
	}, throwsStateError);
	});
	});

	group('throwOnMissingStub', () {
	test('should throw when a mock was called without a matching stub', () {
	throwOnMissingStub(mock);
	when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
	expect(
	() => mock.methodWithoutArgs(),
	throwsA(TypeMatcher<MissingStubError>()),
	);
	});

	test('should not throw when a mock was called with a matching stub', () {
	throwOnMissingStub(mock);
	when(mock.methodWithoutArgs()).thenReturn('A');
	expect(() => mock.methodWithoutArgs(), returnsNormally);
	});

	test(
	'should throw the exception when a mock was called without a matching'
	'stub and an exception builder is set.', () {
	throwOnMissingStub(mock, exceptionBuilder: (_) {
	throw Exception('test message');
	});
	when(mock.methodWithNormalArgs(42)).thenReturn('Ultimate Answer');
	expect(() => mock.methodWithoutArgs(), throwsException);
	});
	});

	test(
	'reports an error when using an argument matcher outside of stubbing or '
	'verification', () {
	expect(() => mock.methodWithNormalArgs(any), throwsArgumentError);
	});

	test(
	'reports an error when using an argument matcher in a position other '
	'than an argument for the stubbed method', () {
	expect(() => when(mock.methodWithListArgs(List.filled(7, any))),
	throwsArgumentError);
	});
	}