fixes #219, able to compile multiple entry points

test/checker/inferred_type_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.
 
 /// Tests for type inference.
 library dev_compiler.test.inferred_type_test;
 
 import 'package:test/test.dart';
 
-import 'package:dev_compiler/src/testing.dart';
+import '../testing.dart';
 
 void main() {
   test('infer type on var', () {
     // Error also expected when declared type is `int`.
     testChecker({
       '/main.dart': '''
       test1() {
         int x = 3;
         x = /*severe:StaticTypeError*/"hi";
       }
@@ skipping 1496 matching lines @@
   });
 
   test('inferred initializing formal checks default value', () => testChecker({
     '/main.dart': '''
       class Foo {
         var x = 1;
         Foo([this.x = /*severe:StaticTypeError*/"1"]);
       }'''
   }));
 }