pkg/analyzer/test/src/diagnostics/unnecessary_null_aware_call_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/dart/analysis/experiments.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(UnnecessaryNullAwareCallTest);
  });
}

@reflectiveTest
class UnnecessaryNullAwareCallTest extends DriverResolutionTest {
  @override
  AnalysisOptionsImpl get analysisOptions =>
      AnalysisOptionsImpl()..enabledExperiments = [EnableString.non_nullable];

  test_getter_parenthesized_nonNull() async {
    await assertErrorsInCode('''
f(int x) {
  (x)?.isEven;
}
''', [
      error(HintCode.UNNECESSARY_NULL_AWARE_CALL, 16, 2),
    ]);
  }

  test_getter_parenthesized_nullable() async {
    await assertNoErrorsInCode('''
f(int? x) {
  (x)?.isEven;
}
''');
  }

  test_getter_simple_nonNull() async {
    await assertErrorsInCode('''
f(int x) {
  x?.isEven;
}
''', [
      error(HintCode.UNNECESSARY_NULL_AWARE_CALL, 14, 2),
    ]);
  }

  test_getter_simple_nullable() async {
    await assertNoErrorsInCode('''
f(int? x) {
  x?.isEven;
}
''');
  }

  test_method_parenthesized_nonNull() async {
    await assertErrorsInCode('''
f(int x) {
  (x)?.round();
}
''', [
      error(HintCode.UNNECESSARY_NULL_AWARE_CALL, 16, 2),
    ]);
  }

  test_method_parenthesized_nullable() async {
    await assertNoErrorsInCode('''
f(int? x) {
  (x)?.round();
}
''');
  }

  test_method_simple_nonNull() async {
    await assertErrorsInCode('''
f(int x) {
  x?.round();
}
''', [
      error(HintCode.UNNECESSARY_NULL_AWARE_CALL, 14, 2),
    ]);
  }

  test_method_simple_nullable() async {
    await assertNoErrorsInCode('''
f(int? x) {
  x?.round();
}
''');
  }
}