Add prefix to path import to work around breaking change

pkg/analyzer/test/generated/source_factory_test.dart

 // Copyright (c) 2015, 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 analyzer.test.generated.test.generated.source_factory;
 
 import 'dart:convert';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisEngine, Logger;
 import 'package:analyzer/src/generated/java_engine_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart' as utils;
 import 'package:analyzer/src/source/source_resource.dart';
 import 'package:package_config/packages.dart';
 import 'package:package_config/packages_file.dart' as pkgfile show parse;
 import 'package:package_config/src/packages_impl.dart';
-import 'package:path/path.dart';
+import 'package:path/path.dart' as pathos;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'test_support.dart';
 
 main() {
   runPackageMapTests();
   defineReflectiveSuite(() {
     defineReflectiveTests(SourceFactoryTest);
   });
@@ skipping 245 matching lines @@
         new SourceFactory([new AbsoluteUriResolver(resourceProvider)]);
     Source containingSource =
         new FileSource(resourceProvider.getFile("/does/not/have.dart"));
     Source result = factory.resolveUri(containingSource, "exist.dart");
     expect(result.fullName,
         FileUtilities2.createFile("/does/not/exist.dart").getAbsolutePath());
   }
 
   void test_resolveUri_nonAbsolute_relative_package() {
     MemoryResourceProvider provider = new MemoryResourceProvider();
-    Context context = provider.pathContext;
+    pathos.Context context = provider.pathContext;
     String packagePath =
         context.joinAll([context.separator, 'path', 'to', 'package']);
     String libPath = context.joinAll([packagePath, 'lib']);
     String dirPath = context.joinAll([libPath, 'dir']);
     String firstPath = context.joinAll([dirPath, 'first.dart']);
     String secondPath = context.joinAll([dirPath, 'second.dart']);
 
     provider.newFolder(packagePath);
     Folder libFolder = provider.newFolder(libPath);
     provider.newFolder(dirPath);
@@ skipping 61 matching lines @@
   UriResolver_SourceFactoryTest_test_fromEncoding_valid(this.encoding);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     if (uri.toString() == encoding) {
       return new TestSource();
     }
     return null;
   }
 }