Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/test/utils_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.
-
-library utils_test;
-
-import 'package:unittest/unittest.dart';
-import 'test_pub.dart';
-import '../lib/src/utils.dart';
-
-main() {
-  initConfig();
-
-  group('yamlToString()', () {
-    test('null', () {
-      expect(yamlToString(null), equals('null'));
-    });
-
-    test('numbers', () {
-      expect(yamlToString(123), equals('123'));
-      expect(yamlToString(12.34), equals('12.34'));
-    });
-
-    test('does not quote strings that do not need it', () {
-      expect(yamlToString('a'), equals('a'));
-      expect(yamlToString('some-string'), equals('some-string'));
-      expect(yamlToString('hey123CAPS'), equals('hey123CAPS'));
-      expect(yamlToString("_under_score"), equals('_under_score'));
-    });
-
-    test('quotes other strings', () {
-      expect(yamlToString(''), equals('""'));
-      expect(yamlToString('123'), equals('"123"'));
-      expect(yamlToString('white space'), equals('"white space"'));
-      expect(yamlToString('"quote"'), equals(r'"\"quote\""'));
-      expect(yamlToString("apostrophe'"), equals('"apostrophe\'"'));
-      expect(yamlToString("new\nline"), equals(r'"new\nline"'));
-      expect(yamlToString("?unctu@t!on"), equals(r'"?unctu@t!on"'));
-    });
-
-    test('lists use JSON style', () {
-      expect(yamlToString([1, 2, 3]), equals('[1,2,3]'));
-    });
-
-    test('uses indentation for maps', () {
-      expect(yamlToString({
-        'a': {
-          'b': 1,
-          'c': 2
-        },
-        'd': 3
-      }), equals("""
-a:
-  b: 1
-  c: 2
-d: 3"""));
-    });
-
-    test('sorts map keys', () {
-      expect(yamlToString({
-        'a': 1,
-        'c': 2,
-        'b': 3,
-        'd': 4
-      }), equals("""
-a: 1
-b: 3
-c: 2
-d: 4"""));
-    });
-
-    test('quotes map keys as needed', () {
-      expect(yamlToString({
-        'no': 1,
-        'yes!': 2,
-        '123': 3
-      }), equals("""
-"123": 3
-no: 1
-"yes!": 2"""));
-    });
-
-    test('handles non-string map keys', () {
-      var map = new Map();
-      map[null] = "null";
-      map[123] = "num";
-      map[true] = "bool";
-
-      expect(yamlToString(map), equals("""
-123: num
-null: null
-true: bool"""));
-    });
-
-    test('handles empty maps', () {
-      expect(yamlToString({}), equals("{}"));
-      expect(yamlToString({
-        'a': {},
-        'b': {}
-      }), equals("""
-a: {}
-b: {}"""));
-    });
-  });
-}