Use indentation for maps in lockfile.

sdk/lib/_internal/pub/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"""));
+    });
+  });
+}