Uncomment and test fixes for importing libraries.

pkg/analysis_testing/lib/abstract_context.dart

Index: pkg/analysis_testing/lib/abstract_context.dart
diff --git a/pkg/analysis_testing/lib/abstract_context.dart b/pkg/analysis_testing/lib/abstract_context.dart
index fe2b7407c8aa60845e7d2c5ee95143b3609135eb..72728ed6af50bfc3b233fe6b3ece3a9eb4406866 100644
--- a/pkg/analysis_testing/lib/abstract_context.dart
+++ b/pkg/analysis_testing/lib/abstract_context.dart
@@ -54,6 +54,23 @@ class AbstractContextTest {
     return source;
   }
 
+  void addUriResolvers(List<UriResolver> resolvers) {
+    resolvers.add(new DartUriResolver(SDK));
+    resolvers.add(new ResourceUriResolver(provider));
+  }
+
+  /**
+   * Performs all analysis tasks in [context].
+   */
+  void performAllAnalysisTasks() {
+    while (true) {
+      AnalysisResult result = context.performAnalysisTask();
+      if (!result.hasMoreWork) {
+        break;
+      }
+    }
+  }
+
   CompilationUnit resolveDartUnit(Source unitSource, Source librarySource) {
     return context.resolveCompilationUnit2(unitSource, librarySource);
   }
@@ -64,8 +81,9 @@ class AbstractContextTest {
 
   void setUp() {
     context = AnalysisEngine.instance.createAnalysisContext();
-    context.sourceFactory = new SourceFactory(<UriResolver>[new DartUriResolver(
-        SDK), new ResourceUriResolver(provider)]);
+    List<UriResolver> resolvers = <UriResolver>[];
+    addUriResolvers(resolvers);
+    context.sourceFactory = new SourceFactory(resolvers);
   }
 
   void tearDown() {