Fixes #163 - small fix in the mangling logic, renames all expected test files

lib/src/info.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.
 
 /**
  * Datatypes holding information extracted by the analyzer and used by later
  * phases of the compiler.
  */
 library info;
 
@@ skipping 21 matching lines @@
 
   /** Base path where all output is generated. */
   final Path _outputDir;
 
   /** Whether to add prefixes and to output file names. */
   final bool _mangleFilenames;
   
   /** Default prefix added to all filenames. */
   static const String _DEFAULT_PREFIX = '_';
 
-  PathInfo(this._baseDir, this._outputDir, [this._mangleFilenames = true]);
+  PathInfo(Path baseDir, Path outputDir, [bool forceMangle = false])
+      : _baseDir = baseDir,
+        _outputDir = outputDir,
+        _mangleFilenames = forceMangle || (baseDir == outputDir);
 
   /** Add a prefix and [suffix] if [_mangleFilenames] is true */
   String mangle(String name, String suffix, [bool forceSuffix = false]) =>
     _mangleFilenames ? "$_DEFAULT_PREFIX$name$suffix"
         : (forceSuffix ? "$name$suffix" : name);
 
   /** 
    * Checks if [input] is valid. It must be in [_baseDir] and must not be in
    * the [_outputDir].
    */
@@ skipping 583 matching lines @@
   }
 
   visitChildren(ElementInfo info) {
     for (var child in info.children) {
       var result = visit(child);
       if (result != null) return result;
     }
     return null;
   }
 }