Add test of unittests.

pkg/compiler/lib/src/apiimpl.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 leg_apiimpl;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:package_config/packages.dart';
@@ skipping 417 matching lines @@
   Future<elements.LibraryElement> analyzeUri(
       Uri uri,
       {bool skipLibraryWithPartOfTag: true}) {
     List<Future> setupFutures = new List<Future>();
     if (sdkLibraries == null) {
       setupFutures.add(setupSdk());
     }
     if (packages == null) {
       setupFutures.add(setupPackages(uri));
     }
-    return Future.wait(setupFutures).then((_) => super.analyzeUri(uri));
+    return Future.wait(setupFutures).then((_) {
+      return super.analyzeUri(uri,
+          skipLibraryWithPartOfTag: skipLibraryWithPartOfTag);
+    });
   }
 
   Future setupPackages(Uri uri) {
     if (packageRoot != null) {
       // Use "non-file" packages because the file version requires a [Directory]
       // and we can't depend on 'dart:io' classes.
       packages = new NonFilePackagesDirectoryPackages(packageRoot);
     } else if (packageConfig != null) {
       return callUserProvider(packageConfig).then((packageConfigContents) {
         if (packageConfigContents is String) {
@@ skipping 133 matching lines @@
   Uri lookupLibraryUri(String libraryName) {
     assert(invariant(NO_LOCATION_SPANNABLE,
         sdkLibraries != null, message: "setupSdk() has not been run"));
     return sdkLibraries[libraryName];
   }
 
   Uri resolvePatchUri(String libraryName) {
     return backend.resolvePatchUri(libraryName, platformConfigUri);
   }
 }