Add test of unittests.

pkg/compiler/lib/src/compiler.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 dart2js.compiler_base;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 944 matching lines @@
   /// If [skipLibraryWithPartOfTag] is `true`, member analysis is skipped if the
   /// library has a `part of` tag, assuming it is a part and not a library.
   ///
   /// This operation assumes an unclosed resolution queue and is only supported
   /// when the '--analyze-main' option is used.
   Future<LibraryElement> analyzeUri(
       Uri libraryUri,
       {bool skipLibraryWithPartOfTag: true}) {
     assert(analyzeMain);
     reporter.log('Analyzing $libraryUri ($buildId)');
-    return libraryLoader.loadLibrary(libraryUri).then((LibraryElement library) {
-      var compilationUnit = library.compilationUnit;
-      if (skipLibraryWithPartOfTag && compilationUnit.partTag != null) {
-        return null;
-      }
+    return libraryLoader.loadLibrary(
+        libraryUri, skipFileWithPartOfTag: true).then(
+            (LibraryElement library) {
+      if (library == null) return null;
       fullyEnqueueLibrary(library, enqueuer.resolution);
       emptyQueue(enqueuer.resolution);
       enqueuer.resolution.logSummary(reporter.log);
       return library;
     });
   }
 
   /// Performs the compilation when all libraries have been loaded.
   void compileLoadedLibraries() {
     computeMain();
@@ skipping 1209 matching lines @@
     if (_otherDependencies == null) {
       _otherDependencies = new Setlet<Element>();
     }
     _otherDependencies.add(element.implementation);
   }
 
   Iterable<Element> get otherDependencies {
     return _otherDependencies != null ? _otherDependencies : const <Element>[];
   }
 }