pkg/analyzer/test/src/diagnostics/invalid_extension_argument_count_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(InvalidExtensionArgumentCountTest);
  });
}

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

  test_many() async {
    await assertErrorsInCode('''
extension E on String {
  void m() {}
}
f() {
  E('a', 'b', 'c').m();
}
''', [
      error(CompileTimeErrorCode.INVALID_EXTENSION_ARGUMENT_COUNT, 49, 15),
    ]);
    assertTypeDynamic(findNode.extensionOverride('E(').extendedType);
  }

  test_one() async {
    await assertNoErrorsInCode('''
extension E on String {
  void m() {}
}
f() {
  E('a').m();
}
''');
  }

  test_zero() async {
    await assertErrorsInCode('''
extension E on String {
  void m() {}
}
f() {
  E().m();
}
''', [
      error(CompileTimeErrorCode.INVALID_EXTENSION_ARGUMENT_COUNT, 49, 2),
    ]);
    assertTypeDynamic(findNode.extensionOverride('E(').extendedType);
  }
}