Properly handle leading zeros in pub version numbers.

sdk/lib/_internal/pub/test/version_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 version_test;
 
 import 'package:unittest/unittest.dart';
 import 'test_pub.dart';
 import '../lib/src/version.dart';
 
@@ skipping 62 matching lines @@
             var b = new Version.parse(versions[j]);
             expect(a < b, equals(i < j));
             expect(a > b, equals(i > j));
             expect(a <= b, equals(i <= j));
             expect(a >= b, equals(i >= j));
             expect(a == b, equals(i == j));
             expect(a != b, equals(i != j));
           }
         }
       });
+
+      test('equality', () {
+        expect(new Version.parse('01.2.3'), equals(new Version.parse('1.2.3')));
+        expect(new Version.parse('1.02.3'), equals(new Version.parse('1.2.3')));
+        expect(new Version.parse('1.2.03'), equals(new Version.parse('1.2.3')));
+        expect(new Version.parse('1.2.3-01'),
+            equals(new Version.parse('1.2.3-1')));
+        expect(new Version.parse('1.2.3+01'),
+            equals(new Version.parse('1.2.3+1')));
+      });
     });
 
     test('allows()', () {
       expect(v123.allows(v123), isTrue);
       expect(v123.allows(v114), isFalse);
       expect(v123.allows(v124), isFalse);
     });
 
     test('intersect()', () {
       // Intersecting the same version returns the version.
@@ skipping 373 matching lines @@
 
 Matcher allows(List<Version> versions) =>
     new VersionConstraintMatcher(versions, true);
 
 Matcher doesNotAllow(List<Version> versions) =>
     new VersionConstraintMatcher(versions, false);
 
 throwsIllegalArg(function) {
   expect(function, throwsA((e) => e is ArgumentError));
 }