Sort pubspec.lock packages.

sdk/lib/_internal/pub/test/lock_file_test.dart

Index: sdk/lib/_internal/pub/test/lock_file_test.dart
diff --git a/sdk/lib/_internal/pub/test/lock_file_test.dart b/sdk/lib/_internal/pub/test/lock_file_test.dart
index 95fcd71fd0b99dc3b82b0ffb1c0552e565b9a8dd..0f7fe53875149a9ec29380ea88bb1e654c9ee19b 100644
--- a/sdk/lib/_internal/pub/test/lock_file_test.dart
+++ b/sdk/lib/_internal/pub/test/lock_file_test.dart
@@ -159,12 +159,16 @@ packages:
     });
 
     group('serialize()', () {
+      var lockfile;
+      setUp(() {
+        lockfile = new LockFile.empty();
+      });
+
       test('dumps the lockfile to YAML', () {
-        var lockfile = new LockFile.empty();
         lockfile.packages['foo'] = new PackageId(
             'foo', mockSource, new Version.parse('1.2.3'), 'foo desc');
         lockfile.packages['bar'] = new PackageId(
-            'foo', mockSource, new Version.parse('3.2.1'), 'bar desc');
+            'bar', mockSource, new Version.parse('3.2.1'), 'bar desc');
 
         expect(loadYaml(lockfile.serialize()), equals({
           'packages': {
@@ -181,6 +185,29 @@ packages:
           }
         }));
       });
+
+      test('lockfile is alphabetized by package name', () {
+        var testNames = ['baz', 'Qwe', 'Q', 'B', 'Bar', 'bar', 'foo'];
+        testNames.forEach((name) {
+          lockfile.packages[name] = new PackageId(name, mockSource,
+            new Version.parse('5.5.5'), '$name desc');
+        });
+
+        expect(lockfile.serialize(),
+          '# Generated by pub\n'
+          '# See http://pub.dartlang.org/doc/glossary.html#lockfile\n'
+          '\n'
+          '{"packages":{'
+          '"B":{"version":"5.5.5","source":"mock","description":"B desc"},'
+          '"Bar":{"version":"5.5.5","source":"mock","description":"Bar desc"},'
+          '"Q":{"version":"5.5.5","source":"mock","description":"Q desc"},'
+          '"Qwe":{"version":"5.5.5","source":"mock","description":"Qwe desc"},'
+          '"bar":{"version":"5.5.5","source":"mock","description":"bar desc"},'
+          '"baz":{"version":"5.5.5","source":"mock","description":"baz desc"},'
+          '"foo":{"version":"5.5.5","source":"mock","description":"foo desc"}}}'
+          '\n'
+        );
+      });
     });
   });
 }