pkg/analyzer/test/src/diagnostics/invalid_override_test.dart

// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:analyzer/src/diagnostic/diagnostic.dart' as diag;
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../dart/resolution/context_collection_resolution.dart';

main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(InvalidOverrideTest);
  });
}

@reflectiveTest
class InvalidOverrideTest extends PubPackageResolutionTest {
  test_abstract_field_covariant_inheritance() async {
    await assertNoErrorsInCode('''
abstract class A {
  abstract covariant num x;
}
abstract class B implements A {
  void set x(Object value); // Implicitly covariant
}
abstract class C implements B {
  int get x;
  void set x(int value); // Ok because covariant
}
''');
  }

  test_class_augment_method_covariant_multiFile_invalid() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';

class A {
  void foo(num a) {}
}

class B extends A {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class B {
  void foo(covariant String a) {}
}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, [error(diag.invalidOverride, 44, 3)]);
  }

  test_class_augment_method_covariant_multiFile_valid() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';

class A {
  void foo(num a) {}
}

class B extends A {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class B {
  void foo(covariant int a) {}
}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, []);
  }

  test_class_augment_method_covariant_singleFile_invalid() async {
    await assertErrorsInCode(
      r'''
class A {
  void foo(num a) {}
}

class B extends A {}

augment class B {
  void foo(covariant String a) {}
}
''',
      [error(diag.invalidOverride, 81, 3)],
    );
  }

  test_class_augment_method_covariant_singleFile_valid() async {
    await assertNoErrorsInCode(r'''
class A {
  void foo(num a) {}
}

class B extends A {}

augment class B {
  void foo(covariant int a) {}
}
''');
  }

  test_class_augment_method_multiFile() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';

class A {
  int foo() => 0;
}

class B extends A {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class B {
  String foo() => '';
}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, [
      error(diag.invalidOverride, 46, 3, contextMessages: [message(a, 32, 3)]),
    ]);
  }

  test_class_augment_method_singleFile() async {
    await assertErrorsInCode(
      r'''
class A {
  int foo() => 0;
}

class B extends A {}

augment class B {
  String foo() => '';
}
''',
      [
        error(
          diag.invalidOverride,
          80,
          3,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_class_augment_setter_multiFile() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';

class A {
  void set foo(int value) {}
}

class B extends A {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class B {
  void set foo(String value) {}
}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, [
      error(
        diag.invalidOverrideSetter,
        48,
        3,
        contextMessages: [message(a, 37, 3)],
      ),
    ]);
  }

  test_class_augment_setter_singleFile() async {
    await assertErrorsInCode(
      r'''
class A {
  void set foo(int value) {}
}

class B extends A {}

augment class B {
  void set foo(String value) {}
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          93,
          3,
          contextMessages: [message(testFile, 21, 3)],
        ),
      ],
    );
  }

  test_class_augment_withClause_multiFile__declaration0_augment1_augment1() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';
part 'c.dart';

mixin M1 {}
mixin M2 {}

class A {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class A with M1 {}
''');

    var c = newFile('$testPackageLibPath/c.dart', r'''
part of 'a.dart';

augment class A with M2 {}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, []);
    await assertErrorsInFile2(c, []);
  }

  test_class_augment_withClause_multiFile_declaration0_augment2() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';

mixin M1 {}
mixin M2 {}

class A {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class A with M1, M2 {}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, []);
  }

  test_class_augment_withClause_multiFile_declaration1_augment1() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';

mixin M1 {}
mixin M2 {}

class A with M1 {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class A with M2 {}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, []);
  }

  test_class_augment_withClause_singleFile_declaration0_augment1() async {
    await assertNoErrorsInCode(r'''
mixin M {}

class A {}

augment class A with M {}
''');
  }

  test_class_augment_withClause_singleFile_declaration0_augment1_augment1() async {
    await assertNoErrorsInCode(r'''
mixin M1 {}
mixin M2 {}

class A {}

augment class A with M1 {}

augment class A with M2 {}
''');
  }

  test_class_augment_withClause_singleFile_declaration0_augment2() async {
    await assertNoErrorsInCode(r'''
mixin M1 {}
mixin M2 {}

class A {}

augment class A with M1, M2 {}
''');
  }

  test_class_augment_withClause_singleFile_declaration1_augment1() async {
    await assertNoErrorsInCode(r'''
mixin M1 {}
mixin M2 {}

class A with M1 {}

augment class A with M2 {}
''');
  }

  test_class_augment_withClause_twoFiles_declaration0_augment1() async {
    var a = newFile('$testPackageLibPath/a.dart', r'''
part 'b.dart';

mixin M {}

class A {}
''');

    var b = newFile('$testPackageLibPath/b.dart', r'''
part of 'a.dart';

augment class A with M {}
''');

    await assertErrorsInFile2(a, []);
    await assertErrorsInFile2(b, []);
  }

  test_external_field_covariant_inheritance() async {
    await assertNoErrorsInCode('''
abstract class A {
  external covariant num x;
}
abstract class B implements A {
  void set x(Object value); // Implicitly covariant
}
abstract class C implements B {
  int get x;
  void set x(int value); // Ok because covariant
}
''');
  }

  test_getter_overrides_abstract_field_covariant_invalid() async {
    await assertErrorsInCode(
      '''
abstract class A {
  abstract covariant int x;
}
abstract class B implements A {
  num get x;
  void set x(num value);
}
''',
      [
        error(
          diag.invalidOverride,
          91,
          1,
          contextMessages: [message(testFile, 44, 1)],
        ),
      ],
    );
  }

  test_getter_overrides_abstract_field_covariant_valid() async {
    await assertNoErrorsInCode('''
abstract class A {
  abstract covariant num x;
}
abstract class B implements A {
  int get x;
}
''');
  }

  test_getter_overrides_abstract_field_final_invalid() async {
    await assertErrorsInCode(
      '''
abstract class A {
  abstract final int x;
}
abstract class B implements A {
  num get x;
  void set x(num value);
}
''',
      [
        error(
          diag.invalidOverride,
          87,
          1,
          contextMessages: [message(testFile, 40, 1)],
        ),
      ],
    );
  }

  test_getter_overrides_abstract_field_final_valid() async {
    await assertNoErrorsInCode('''
abstract class A {
  abstract final num x;
}
abstract class B implements A {
  int get x;
}
''');
  }

  test_getter_overrides_abstract_field_invalid() async {
    await assertErrorsInCode(
      '''
abstract class A {
  abstract int x;
}
abstract class B implements A {
  num get x;
  void set x(num value);
}
''',
      [
        error(
          diag.invalidOverride,
          81,
          1,
          contextMessages: [message(testFile, 34, 1)],
        ),
      ],
    );
  }

  test_getter_overrides_abstract_field_valid() async {
    await assertNoErrorsInCode('''
abstract class A {
  abstract num x;
}
abstract class B implements A {
  int get x;
}
''');
  }

  test_getter_overrides_external_field_covariant_invalid() async {
    await assertErrorsInCode(
      '''
class A {
  external covariant int x;
}
abstract class B implements A {
  num get x;
  void set x(num value);
}
''',
      [
        error(
          diag.invalidOverride,
          82,
          1,
          contextMessages: [message(testFile, 35, 1)],
        ),
      ],
    );
  }

  test_getter_overrides_external_field_covariant_valid() async {
    await assertNoErrorsInCode('''
class A {
  external covariant num x;
}
abstract class B implements A {
  int get x;
}
''');
  }

  test_getter_overrides_external_field_final_invalid() async {
    await assertErrorsInCode(
      '''
class A {
  external final int x;
}
abstract class B implements A {
  num get x;
  void set x(num value);
}
''',
      [
        error(
          diag.invalidOverride,
          78,
          1,
          contextMessages: [message(testFile, 31, 1)],
        ),
      ],
    );
  }

  test_getter_overrides_external_field_final_valid() async {
    await assertNoErrorsInCode('''
class A {
  external final num x;
}
abstract class B implements A {
  int get x;
}
''');
  }

  test_getter_overrides_external_field_invalid() async {
    await assertErrorsInCode(
      '''
class A {
  external int x;
}
abstract class B implements A {
  num get x;
  void set x(num value);
}
''',
      [
        error(
          diag.invalidOverride,
          72,
          1,
          contextMessages: [message(testFile, 25, 1)],
        ),
      ],
    );
  }

  test_getter_overrides_external_field_valid() async {
    await assertNoErrorsInCode('''
class A {
  external num x;
}
abstract class B implements A {
  int get x;
}
''');
  }

  test_getter_returnType() async {
    await assertErrorsInCode(
      '''
class A {
  int get g { return 0; }
}
class B extends A {
  String get g { return 'a'; }
}
''',
      [
        error(
          diag.invalidOverride,
          71,
          1,
          contextMessages: [message(testFile, 20, 1)],
        ),
      ],
    );
  }

  test_getter_returnType_implicit() async {
    await assertErrorsInCode(
      '''
class A {
  String? f;
}
class B extends A {
  int? f;
}
''',
      [
        error(
          diag.invalidOverride,
          52,
          1,
          contextMessages: [message(testFile, 20, 1)],
        ),
        error(
          diag.invalidOverrideSetter,
          52,
          1,
          contextMessages: [message(testFile, 20, 1)],
        ),
      ],
    );
  }

  test_getter_returnType_twoInterfaces() async {
    // test from language/override_inheritance_field_test_11.dart
    await assertErrorsInCode(
      '''
abstract class I {
  int get getter => 0;
}
abstract class J {
  num get getter => 0;
}
abstract class A implements I, J {}
class B extends A {
  String get getter => '';
}
''',
      [
        error(
          diag.invalidOverride,
          157,
          6,
          contextMessages: [message(testFile, 29, 6)],
        ),
      ],
    );
  }

  test_getter_returnType_twoInterfaces_conflicting() async {
    await assertErrorsInCode(
      '''
abstract class I<U> {
  U get g => throw 0;
}
abstract class J<V> {
  V get g => throw 0;
}
class B implements I<int>, J<String> {
  double get g => throw 0;
}
''',
      [
        error(
          diag.invalidOverride,
          144,
          1,
          contextMessages: [message(testFile, 30, 1)],
        ),
        error(
          diag.invalidOverride,
          144,
          1,
          contextMessages: [message(testFile, 76, 1)],
        ),
      ],
    );
  }

  test_issue48468() async {
    await assertNoErrorsInCode(r'''
abstract class A {
  void foo<T extends R, R>();
}

class B implements A {
  void foo<T extends R, R>() {}
}
''');
  }

  test_method_abstractOverridesConcrete() async {
    await assertErrorsInCode(
      '''
class A	{
  int add(int a, int b) => a + b;
}
class B	extends A {
  int add();
}
''',
      [
        error(diag.invalidImplementationOverride, 52, 1),
        error(
          diag.invalidOverride,
          72,
          3,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_method_abstractOverridesConcreteInMixin() async {
    await assertErrorsInCode(
      '''
mixin M {
  int add(int a, int b) => a + b;
}
class A with M {
  int add();
}
''',
      [
        error(diag.invalidImplementationOverride, 52, 1),
        error(
          diag.invalidOverride,
          69,
          3,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_method_abstractOverridesConcreteViaMixin() async {
    await assertErrorsInCode(
      '''
class A {
  int add(int a, int b) => a + b;
}
mixin M {
  int add();
}
class B	extends A with M {}
''',
      [
        error(diag.invalidImplementationOverride, 77, 1),
        error(
          diag.invalidOverride,
          94,
          1,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_method_covariant_1() async {
    await assertNoErrorsInCode(r'''
abstract class A<T> {
  A<U> foo<U>(covariant A<Map<T, U>> a);
}

abstract class B<U, T> extends A<T> {
  B<U, V> foo<V>(B<U, Map<T, V>> a);
}
''');
  }

  test_method_covariant_2() async {
    await assertNoErrorsInCode(r'''
abstract class A {
  R foo<R>(VA<R> v);
}

abstract class B implements A {
  R foo<R>(covariant VB<R> v);
}

abstract class VA<T> {}

abstract class VB<T> implements VA<T> {}
''');
  }

  test_method_covariant_3() async {
    await assertErrorsInCode(
      r'''
class A {
  void foo(num a) {}
}

class B extends A {
  void foo(dynamic a) {}
}

class C extends B {
  void foo(covariant String a) {}
}
''',
      [error(diag.invalidOverride, 109, 3)],
    );
  }

  test_method_named_fewerNamedParameters() async {
    await assertErrorsInCode(
      '''
class A {
  m({a, b}) {}
}
class B extends A {
  m({a}) {}
}
''',
      [
        error(
          diag.invalidOverride,
          49,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_named_missingNamedParameter() async {
    await assertErrorsInCode(
      '''
class A {
  m({a, b}) {}
}
class B extends A {
  m({a, c}) {}
}
''',
      [
        error(
          diag.invalidOverride,
          49,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_namedParamType() async {
    await assertErrorsInCode(
      '''
class A {
  m({int? a}) {}
}
class B implements A {
  m({String? a}) {}
}
''',
      [
        error(
          diag.invalidOverride,
          54,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_normalParamType_interface() async {
    await assertErrorsInCode(
      '''
class A {
  m(int a) {}
}
class B implements A {
  m(String a) {}
}
''',
      [
        error(
          diag.invalidOverride,
          51,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_normalParamType_superclass() async {
    await assertErrorsInCode(
      '''
class A {
  m(int a) {}
}
class B extends A {
  m(String a) {}
}
''',
      [
        error(
          diag.invalidOverride,
          48,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_normalParamType_superclass_interface() async {
    await assertErrorsInCode(
      '''
abstract class I<U> {
  void m(U u) => null;
}
abstract class J<V> {
  void m(V v) => null;
}
class B extends I<int> implements J<String> {
  void m(double d) {}
}
''',
      [
        error(
          diag.invalidOverride,
          147,
          1,
          contextMessages: [message(testFile, 76, 1)],
        ),
        error(
          diag.invalidOverride,
          147,
          1,
          contextMessages: [message(testFile, 29, 1)],
        ),
      ],
    );
  }

  test_method_normalParamType_twoInterfaces() async {
    await assertErrorsInCode(
      '''
abstract class I {
  m(int n);
}
abstract class J {
  m(num n);
}
abstract class A implements I, J {}
class B extends A {
  m(String n) {}
}
''',
      [
        error(
          diag.invalidOverride,
          124,
          1,
          contextMessages: [message(testFile, 54, 1)],
        ),
      ],
    );
  }

  test_method_normalParamType_twoInterfaces_conflicting() async {
    // language/override_inheritance_generic_test/08
    await assertErrorsInCode(
      '''
abstract class I<U> {
  void m(U u) => null;
}
abstract class J<V> {
  void m(V v) => null;
}
class B implements I<int>, J<String> {
  void m(double d) {}
}
''',
      [
        error(
          diag.invalidOverride,
          140,
          1,
          contextMessages: [message(testFile, 29, 1)],
        ),
        error(
          diag.invalidOverride,
          140,
          1,
          contextMessages: [message(testFile, 76, 1)],
        ),
      ],
    );
  }

  test_method_optionalParamType() async {
    await assertErrorsInCode(
      '''
class A {
  m([int? a]) {}
}
class B implements A {
  m([String? a]) {}
}
''',
      [
        error(
          diag.invalidOverride,
          54,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_optionalParamType_twoInterfaces() async {
    await assertErrorsInCode(
      '''
abstract class I {
  m([int? n]);
}
abstract class J {
  m([num? n]);
}
abstract class A implements I, J {}
class B extends A {
  m([String? n]) {}
}
''',
      [
        error(
          diag.invalidOverride,
          130,
          1,
          contextMessages: [message(testFile, 57, 1)],
        ),
      ],
    );
  }

  test_method_positional_optional() async {
    await assertErrorsInCode(
      '''
class A {
  m([a, b]) {}
}
class B extends A {
  m([a]) {}
}
''',
      [
        error(
          diag.invalidOverride,
          49,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_positional_optionalAndRequired() async {
    await assertErrorsInCode(
      '''
class A {
  m(a, b, [c, d]) {}
}
class B extends A {
  m(a, b, [c]) {}
}
''',
      [
        error(
          diag.invalidOverride,
          55,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_positional_optionalAndRequired2() async {
    await assertErrorsInCode(
      '''
class A {
  m(a, b, [c, d]) {}
}
class B extends A {
  m(a, [c, d]) {}
}
''',
      [
        error(
          diag.invalidOverride,
          55,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_required() async {
    await assertErrorsInCode(
      '''
class A {
  m(a) {}
}
class B extends A {
  m(a, b) {}
}
''',
      [
        error(
          diag.invalidOverride,
          44,
          1,
          contextMessages: [message(testFile, 12, 1)],
        ),
      ],
    );
  }

  test_method_returnType_interface() async {
    await assertErrorsInCode(
      '''
class A {
  int m() { return 0; }
}
class B implements A {
  String m() { return 'a'; }
}
''',
      [
        error(
          diag.invalidOverride,
          68,
          1,
          contextMessages: [message(testFile, 16, 1)],
        ),
      ],
    );
  }

  @SkippedTest() // TODO(scheglov): implement augmentation
  test_method_returnType_interface_fromAugmentation() async {
    await assertErrorsInCode(
      '''
class A {
  int foo() => 0;
}

class B {
  String foo() => '';
}

augment class B implements A {}
''',
      [
        error(
          diag.invalidOverride,
          50,
          3,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_method_returnType_interface_grandparent() async {
    await assertErrorsInCode(
      '''
abstract class A {
  int m();
}
abstract class B implements A {
}
class C implements B {
  String m() { return 'a'; }
}
''',
      [
        error(
          diag.invalidOverride,
          98,
          1,
          contextMessages: [message(testFile, 25, 1)],
        ),
      ],
    );
  }

  test_method_returnType_mixin() async {
    await assertErrorsInCode(
      '''
mixin class A {
  int m() { return 0; }
}
class B extends Object with A {
  String m() { return 'a'; }
}
''',
      [
        error(
          diag.invalidOverride,
          83,
          1,
          contextMessages: [message(testFile, 22, 1)],
        ),
      ],
    );
  }

  test_method_returnType_superclass() async {
    await assertErrorsInCode(
      '''
class A {
  int m() { return 0; }
}
class B extends A {
  String m() { return 'a'; }
}
''',
      [
        error(
          diag.invalidOverride,
          65,
          1,
          contextMessages: [message(testFile, 16, 1)],
        ),
      ],
    );
  }

  @SkippedTest() // TODO(scheglov): implement augmentation
  test_method_returnType_superclass_fromAugmentation() async {
    await assertErrorsInCode(
      '''
class A {
  int foo() => 0;
}

class B {
  String foo() => '';
}

augment class B extends A {}
''',
      [
        error(
          diag.invalidOverride,
          50,
          3,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_method_returnType_superclass_grandparent() async {
    await assertErrorsInCode(
      '''
class A {
  int m() { return 0; }
}
class B extends A {
}
class C extends B {
  String m() { return 'a'; }
}
''',
      [
        error(
          diag.invalidOverride,
          87,
          1,
          contextMessages: [message(testFile, 16, 1)],
        ),
      ],
    );
  }

  test_method_returnType_twoInterfaces() async {
    await assertErrorsInCode(
      '''
abstract class I {
  int m();
}
abstract class J {
  num m();
}
abstract class A implements I, J {}
class B extends A {
  String m() => '';
}
''',
      [
        error(
          diag.invalidOverride,
          129,
          1,
          contextMessages: [message(testFile, 25, 1)],
        ),
      ],
    );
  }

  test_method_returnType_void() async {
    await assertErrorsInCode(
      '''
class A {
  int m() { return 0; }
}
class B extends A {
  void m() {}
}
''',
      [
        error(
          diag.invalidOverride,
          63,
          1,
          contextMessages: [message(testFile, 16, 1)],
        ),
      ],
    );
  }

  test_mixin_field_type_on() async {
    await assertErrorsInCode(
      r'''
class A {
  String foo = '';
}

mixin M on A {
  int foo = 0;
}
''',
      [
        error(
          diag.invalidOverride,
          53,
          3,
          contextMessages: [message(testFile, 19, 3)],
        ),
        error(
          diag.invalidOverrideSetter,
          53,
          3,
          contextMessages: [message(testFile, 19, 3)],
        ),
      ],
    );
  }

  test_mixin_getter_type_on() async {
    await assertErrorsInCode(
      r'''
class A {
  String get foo => '';
}

mixin M on A {
  int get foo => 0;
}
''',
      [
        error(
          diag.invalidOverride,
          62,
          3,
          contextMessages: [message(testFile, 23, 3)],
        ),
      ],
    );
  }

  test_mixin_method_returnType_on() async {
    await assertErrorsInCode(
      r'''
class A {
  String foo() => '';
}

mixin M on A {
  int foo() => 0;
}
''',
      [
        error(
          diag.invalidOverride,
          56,
          3,
          contextMessages: [message(testFile, 19, 3)],
        ),
      ],
    );
  }

  @SkippedTest() // TODO(scheglov): implement augmentation
  test_mixin_method_returnType_on_fromAugmentation() async {
    await assertErrorsInCode(
      r'''
class A {
  int foo() => 0;
}

mixin M {
  String foo() => '';
}

augment mixin M on A {}
''',
      [
        error(
          diag.invalidOverride,
          50,
          3,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_mixin_setter_type_on() async {
    await assertErrorsInCode(
      r'''
class A {
  set foo(String _) {}
}

mixin M on A {
  set foo(int _) {}
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          57,
          3,
          contextMessages: [message(testFile, 16, 3)],
        ),
      ],
    );
  }

  test_setter_normalParamType() async {
    await assertErrorsInCode(
      '''
class A {
  void set s(int v) {}
}
class B extends A {
  void set s(String v) {}
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          66,
          1,
          contextMessages: [message(testFile, 21, 1)],
        ),
      ],
    );
  }

  test_setter_normalParamType_superclass_interface() async {
    await assertErrorsInCode(
      '''
abstract class I {
  set setter14(int _) => null;
}
abstract class J {
  set setter14(num _) => null;
}
abstract class A extends I implements J {}
class B extends A {
  set setter14(String _) => null;
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          173,
          8,
          contextMessages: [message(testFile, 77, 8)],
        ),
      ],
    );
  }

  test_setter_normalParamType_twoInterfaces() async {
    // test from language/override_inheritance_field_test_34.dart
    await assertErrorsInCode(
      '''
abstract class I {
  set setter14(int _) => null;
}
abstract class J {
  set setter14(num _) => null;
}
abstract class A implements I, J {}
class B extends A {
  set setter14(String _) => null;
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          166,
          8,
          contextMessages: [message(testFile, 77, 8)],
        ),
      ],
    );
  }

  test_setter_normalParamType_twoInterfaces_conflicting() async {
    await assertErrorsInCode(
      '''
abstract class I<U> {
  set s(U u) {}
}
abstract class J<V> {
  set s(V v) {}
}
class B implements I<int>, J<String> {
  set s(double d) {}
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          125,
          1,
          contextMessages: [message(testFile, 28, 1)],
        ),
        error(
          diag.invalidOverrideSetter,
          125,
          1,
          contextMessages: [message(testFile, 68, 1)],
        ),
      ],
    );
  }

  test_setter_overrides_abstract_field_covariant_valid() async {
    await assertNoErrorsInCode('''
abstract class A {
  abstract covariant num x;
}
abstract class B implements A {
  int get x;
  void set x(int value);
}
''');
  }

  test_setter_overrides_abstract_field_final_valid() async {
    await assertNoErrorsInCode('''
abstract class A {
  abstract final num x;
}
abstract class B implements A {
  int get x;
  void set x(int value);
}
''');
  }

  test_setter_overrides_abstract_field_invalid() async {
    await assertErrorsInCode(
      '''
abstract class A {
  abstract num x;
}
abstract class B implements A {
  int get x;
  void set x(int value);
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          95,
          1,
          contextMessages: [message(testFile, 34, 1)],
          messageContains: ["'B.x'"],
        ),
      ],
    );
  }

  test_setter_overrides_abstract_field_valid() async {
    await assertNoErrorsInCode('''
abstract class A {
  abstract int x;
}
abstract class B implements A {
  void set x(num value);
}
''');
  }

  test_setter_overrides_external_field_covariant_valid() async {
    await assertNoErrorsInCode('''
class A {
  external covariant num x;
}
abstract class B implements A {
  int get x;
  void set x(int value);
}
''');
  }

  test_setter_overrides_external_field_final_valid() async {
    await assertNoErrorsInCode('''
class A {
  external final num x;
}
abstract class B implements A {
  int get x;
  void set x(int value);
}
''');
  }

  test_setter_overrides_external_field_invalid() async {
    await assertErrorsInCode(
      '''
class A {
  external num x;
}
abstract class B implements A {
  int get x;
  void set x(int value);
}
''',
      [
        error(
          diag.invalidOverrideSetter,
          86,
          1,
          contextMessages: [message(testFile, 25, 1)],
        ),
      ],
    );
  }

  test_setter_overrides_external_field_valid() async {
    await assertNoErrorsInCode('''
class A {
  external int x;
}
abstract class B implements A {
  void set x(num value);
}
''');
  }
}