In the new task model, use explicit dependencies on the type provider.

pkg/analyzer/test/src/task/dart_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 test.src.task.dart_test;
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 2349 matching lines @@
   }
 
   void setUp() {
     super.setUp();
     emptySource = newSource('/test.dart');
   }
 
   void _computeResult(AnalysisTarget target, ResultDescriptor result) {
     oldOutputs = outputs;
     task = analysisDriver.computeResult(target, result);
+    expect(task, isNotNull);
     expect(task.caughtException, isNull);
     outputs = task.outputs;
   }
 
   /**
    * Fill [errorListener] with [result] errors in the current [task].
    */
   void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
     List<AnalysisError> errors = task.outputs[result];
     expect(errors, isNotNull, reason: result.name);
     errorListener = new GatheringErrorListener();
     errorListener.addAll(errors);
   }
 }