fixes #219, able to compile multiple entry points

test/checker/checker_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.
 
 /// General type checking tests
 library dev_compiler.test.checker_test;
 
 import 'package:test/test.dart';
 
-import 'package:dev_compiler/src/testing.dart';
-import '../test_util.dart' show testDirectory;
+import '../testing.dart';
 
 void main() {
   test('ternary operator', () {
     testChecker({
       '/main.dart': '''
         abstract class Comparable<T> {
           int compareTo(T other);
           static int compare(Comparable a, Comparable b) => a.compareTo(b);
         }
         typedef int Comparator<T>(T a, T b);
@@ skipping 2711 matching lines @@
 
         baz1() sync* { yield* (/*info:DynamicCast*/x); }
         Iterable baz2() sync* { yield* (/*info:DynamicCast*/x); }
         Iterable<int> baz3() sync* { yield* (/*warning:DownCastComposite*/x); }
         Iterable<int> baz4() sync* { yield* new Iterable<int>(); }
         Iterable<int> baz5() sync* { yield* (/*info:InferredTypeAllocation*/new Iterable()); }
     '''
     }));
   });
 }