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

// Copyright (c) 2021, 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/error/codes.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

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

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

@reflectiveTest
class MixinOnTypeAliasExpandsToTypeParameterTest
    extends PubPackageResolutionTest {
  test_class() async {
    await assertNoErrorsInCode(r'''
class A {}
typedef T = A;
mixin M on A {}
''');
  }

  test_class_noTypeArguments() async {
    await assertErrorsInCode(r'''
class A {}
typedef T<X extends A> = X;
mixin M on T {}
''', [
      error(CompileTimeErrorCode.MIXIN_ON_TYPE_ALIAS_EXPANDS_TO_TYPE_PARAMETER,
          50, 1),
    ]);
  }

  test_class_withTypeArguments() async {
    await assertErrorsInCode(r'''
class A {}
typedef T<X extends A> = X;
mixin M on T<A> {}
''', [
      error(CompileTimeErrorCode.MIXIN_ON_TYPE_ALIAS_EXPANDS_TO_TYPE_PARAMETER,
          50, 1),
    ]);
  }
}