Rev package version as the extended source map format is a new feature.

test/parser_test.dart

 // Copyright (c) 2013, 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 test.parser_test;
 
 import 'dart:convert';
 import 'package:test/test.dart';
 import 'package:source_maps/source_maps.dart';
 import 'package:source_span/source_span.dart';
@@ skipping 25 matching lines @@
   'mappings': 'AAAAA',
   'file': 'output.dart'
 };
 
 const Map<String, dynamic> MAP_WITH_SOURCE_LOCATION_AND_NAME_1 = const {
   'version': 3,
   'sourceRoot': 'pkg/',
   'sources': const ['input1.dart'],
   'names': const ['var1'],
   'mappings': 'AAAAA',
-  'file': 'output1.dart'
+  'file': 'output.dart'
 };
 
 const Map<String, dynamic> MAP_WITH_SOURCE_LOCATION_AND_NAME_2 = const {
   'version': 3,
   'sourceRoot': 'pkg/',
   'sources': const ['input2.dart'],
   'names': const ['var2'],
   'mappings': 'AAAAA',
   'file': 'output2.dart'
 };
 
+const Map<String, dynamic> MAP_WITH_SOURCE_LOCATION_AND_NAME_3 = const {
+  'version': 3,
+  'sourceRoot': 'pkg/',
+  'sources': const ['input3.dart'],
+  'names': const ['var3'],
+  'mappings': 'AAAAA',
+  'file': '3/output.dart'
+};
+
 const List SOURCE_MAP_BUNDLE = const [
   MAP_WITH_SOURCE_LOCATION_AND_NAME_1,
-  MAP_WITH_SOURCE_LOCATION_AND_NAME_2
+  MAP_WITH_SOURCE_LOCATION_AND_NAME_2,
+  MAP_WITH_SOURCE_LOCATION_AND_NAME_3,
 ];
 
 main() {
   test('parse', () {
     var mapping = parseJson(EXPECTED_MAP);
     check(outputVar1, mapping, inputVar1, false);
     check(outputVar2, mapping, inputVar2, false);
     check(outputFunction, mapping, inputFunction, false);
     check(outputExpr, mapping, inputExpr, false);
   });
@@ skipping 81 matching lines @@
         Uri.parse("file:///path/to/pkg/input.dart"));
   });
 
   group('parse with bundle', () {
     var mapping =
         parseJsonExtended(SOURCE_MAP_BUNDLE, mapUrl: "file:///path/to/map");
     test('simple', () {
       expect(
           mapping
               .spanForLocation(new SourceLocation(0,
-                  sourceUrl: new Uri.file('/path/to/output1.dart')))
+                  sourceUrl: new Uri.file('/path/to/output.dart')))
               .sourceUrl,
           Uri.parse("file:///path/to/pkg/input1.dart"));
       expect(
           mapping
               .spanForLocation(new SourceLocation(0,
                   sourceUrl: new Uri.file('/path/to/output2.dart')))
               .sourceUrl,
           Uri.parse("file:///path/to/pkg/input2.dart"));
+      expect(
+          mapping
+              .spanForLocation(new SourceLocation(0,
+                  sourceUrl: new Uri.file('/path/to/3/output.dart')))
+              .sourceUrl,
+          Uri.parse("file:///path/to/pkg/input3.dart"));
 
       expect(
-          mapping.spanFor(0, 0, uri: "file:///path/to/output1.dart").sourceUrl,
+          mapping.spanFor(0, 0, uri: "file:///path/to/output.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input1.dart"));
       expect(
           mapping.spanFor(0, 0, uri: "file:///path/to/output2.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input2.dart"));
+      expect(
+          mapping.spanFor(0, 0, uri: "file:///path/to/3/output.dart").sourceUrl,
+          Uri.parse("file:///path/to/pkg/input3.dart"));
     });
 
     test('unmapped path', () {
       var span = mapping.spanFor(0, 0, uri: "unmapped_output.dart");
       expect(span.sourceUrl, Uri.parse("unmapped_output.dart"));
       expect(span.start.line, equals(0));
       expect(span.start.column, equals(0));
 
       span = mapping.spanFor(10, 5, uri: "unmapped_output.dart");
       expect(span.sourceUrl, Uri.parse("unmapped_output.dart"));
       expect(span.start.line, equals(10));
       expect(span.start.column, equals(5));
     });
 
     test('missing path', () {
       expect(() => mapping.spanFor(0, 0), throws);
     });
 
     test('incomplete paths', () {
-      expect(mapping.spanFor(0, 0, uri: "output1.dart").sourceUrl,
+      expect(mapping.spanFor(0, 0, uri: "output.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input1.dart"));
       expect(mapping.spanFor(0, 0, uri: "output2.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input2.dart"));
+      expect(mapping.spanFor(0, 0, uri: "3/output.dart").sourceUrl,
+          Uri.parse("file:///path/to/pkg/input3.dart"));
     });
 
     test('parseExtended', () {
       var mapping = parseExtended(JSON.encode(SOURCE_MAP_BUNDLE),
           mapUrl: "file:///path/to/map");
 
-      expect(mapping.spanFor(0, 0, uri: "output1.dart").sourceUrl,
+      expect(mapping.spanFor(0, 0, uri: "output.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input1.dart"));
       expect(mapping.spanFor(0, 0, uri: "output2.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input2.dart"));
+      expect(mapping.spanFor(0, 0, uri: "3/output.dart").sourceUrl,
+          Uri.parse("file:///path/to/pkg/input3.dart"));
     });
 
     // Test that the source map can handle cases where the uri passed in is
     // not from the expected host but it is still unambiguous which source
     // map should be used.
     test('different paths', () {
       expect(
           mapping
               .spanForLocation(new SourceLocation(0,
-                  sourceUrl: Uri.parse('http://localhost/output1.dart')))
+                  sourceUrl: Uri.parse('http://localhost/output.dart')))
               .sourceUrl,
           Uri.parse("file:///path/to/pkg/input1.dart"));
       expect(
           mapping
               .spanForLocation(new SourceLocation(0,
                   sourceUrl: Uri.parse('http://localhost/output2.dart')))
               .sourceUrl,
           Uri.parse("file:///path/to/pkg/input2.dart"));
+      expect(
+          mapping
+              .spanForLocation(new SourceLocation(0,
+                  sourceUrl: Uri.parse('http://localhost/3/output.dart')))
+              .sourceUrl,
+          Uri.parse("file:///path/to/pkg/input3.dart"));
 
       expect(
-          mapping.spanFor(0, 0, uri: "http://localhost/output1.dart").sourceUrl,
+          mapping.spanFor(0, 0, uri: "http://localhost/output.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input1.dart"));
       expect(
           mapping.spanFor(0, 0, uri: "http://localhost/output2.dart").sourceUrl,
           Uri.parse("file:///path/to/pkg/input2.dart"));
+      expect(
+          mapping
+              .spanFor(0, 0, uri: "http://localhost/3/output.dart")
+              .sourceUrl,
+          Uri.parse("file:///path/to/pkg/input3.dart"));
     });
   });
 
   test('parse and re-emit', () {
     for (var expected in [
       EXPECTED_MAP,
       MAP_WITH_NO_SOURCE_LOCATION,
       MAP_WITH_SOURCE_LOCATION,
       MAP_WITH_SOURCE_LOCATION_AND_NAME
     ]) {
       var mapping = parseJson(expected);
       expect(mapping.toJson(), equals(expected));
 
       mapping = parseJsonExtended(expected);
       expect(mapping.toJson(), equals(expected));
     }
     // Invalid for this case
     expect(() => parseJson(SOURCE_MAP_BUNDLE as dynamic), throws);
 
     var mapping = parseJsonExtended(SOURCE_MAP_BUNDLE);
     expect(mapping.toJson(), equals(SOURCE_MAP_BUNDLE));
   });
 }