pkg/compiler/test/codegen/builtin_equals_test.dart

// Copyright (c) 2012, 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.

// @dart = 2.7

import 'package:expect/expect.dart';
import 'package:async_helper/async_helper.dart';
import '../helpers/compiler_helper.dart';

const String TEST = r"""
foo() {
  String s = new Object().toString();
  Object o = new Object().toString();
  return s == 'foo'
    && s == null
    && null == s
    && null == o;
}
""";

main() {
  test() async {
    await compile(TEST, entry: 'foo', enableTypeAssertions: true,
        check: (String generated) {
      Expect.isTrue(!generated.contains('eqB'));

      RegExp regexp = new RegExp('==');
      Iterator<Match> matches = regexp.allMatches(generated).iterator;
      // `s == null` and `null == s` now both encoded as `s == null` allowing
      // the second to be optimized away.
      checkNumberOfMatches(matches, 3);
    });
  }

  asyncTest(() async {
    print('--test from kernel------------------------------------------------');
    await test();
  });
}