pkg/analyzer/test/src/diagnostics/implements_repeated_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(ImplementsRepeatedTest);
  });
}

@reflectiveTest
class ImplementsRepeatedTest extends PubPackageResolutionTest {
  test_class_implements_2times() async {
    await assertErrorsInCode(r'''
class A {}
class B implements A, A {} // ref
''', [
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 33, 1),
    ]);

    var A = findElement.class_('A');
    assertTypeName(findNode.typeName('A, A {} // ref'), A, 'A');
    assertTypeName(findNode.typeName('A {} // ref'), A, 'A');
  }

  test_class_implements_2times_viaTypeAlias() async {
    await assertErrorsInCode(r'''
class A {}
typedef B = A;
class C implements A, B {} // ref
''', [
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 48, 1),
    ]);

    assertTypeName(
      findNode.typeName('A, B {} // ref'),
      findElement.class_('A'),
      'A',
    );

    assertTypeName(
      findNode.typeName('B {} // ref'),
      findElement.typeAlias('B'),
      'A',
    );
  }

  test_class_implements_4times() async {
    await assertErrorsInCode(r'''
class A {} class C{}
class B implements A, A, A, A {}
''', [
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 43, 1),
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 46, 1),
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 49, 1),
    ]);
  }

  test_mixin_implements_2times() async {
    await assertErrorsInCode(r'''
class A {}
mixin M implements A, A {}
''', [
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 33, 1),
    ]);
  }

  test_mixin_implements_4times() async {
    await assertErrorsInCode(r'''
class A {}
mixin M implements A, A, A, A {}
''', [
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 33, 1),
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 36, 1),
      error(CompileTimeErrorCode.IMPLEMENTS_REPEATED, 39, 1),
    ]);
  }
}