pkg/analyzer/test/src/diagnostics/invalid_use_of_covariant_in_extension_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/dart/analysis/features.dart';
import 'package:analyzer/src/error/codes.dart';
import 'package:analyzer/src/generated/engine.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../dart/resolution/driver_resolution.dart';

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

@reflectiveTest
class InvalidUseOfCovariantInExtensionTest extends DriverResolutionTest {
  @override
  AnalysisOptionsImpl get analysisOptions => AnalysisOptionsImpl()
    ..contextFeatures = new FeatureSet.forTesting(
        sdkVersion: '2.3.0', additionalFeatures: [Feature.extension_methods]);

  test_optional_named() async {
    await assertErrorsInCode('''
extension E on String {
  void foo({covariant int a}) {}
}
''', [
      error(CompileTimeErrorCode.INVALID_USE_OF_COVARIANT_IN_EXTENSION, 36, 9),
    ]);
  }

  test_optional_positional() async {
    await assertErrorsInCode('''
extension E on String {
  void foo([covariant int a]) {}
}
''', [
      error(CompileTimeErrorCode.INVALID_USE_OF_COVARIANT_IN_EXTENSION, 36, 9),
    ]);
  }

  test_required_positional() async {
    await assertErrorsInCode('''
extension E on String {
  void foo(covariant int a) {}
}
''', [
      error(CompileTimeErrorCode.INVALID_USE_OF_COVARIANT_IN_EXTENSION, 35, 9),
    ]);
  }
}