Make unittest follow the new package layout.

utils/tests/pub/yaml_test.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('yaml_test');
 
 #import('dart:math');
 
-#import('../../../pkg/unittest/unittest.dart');
+#import('../../../pkg/unittest/lib/unittest.dart');
 #import('../../pub/yaml/yaml.dart');
 #import('../../pub/yaml/deep_equals.dart');
 #import('../../../tests/utils/test_utils.dart');
 
 /** Constructs a new yaml.YamlMap, optionally from a normal Map. */
 Map yamlMap([Map from]) =>
     from == null ? new YamlMap() : new YamlMap.from(from);
 
 /**
  * Asserts that a string containing a single YAML document produces a given
@@ skipping 1854 matching lines @@
         A null: null
         Also a null: # Empty
         Not a null: ""
         Booleans: [ true, True, false, FALSE ]
         Integers: [ 0, 0o7, 0x3A, -19 ]
         Floats: [ 0., -0.0, .5, +12e03, -2E+05 ]
         Also floats: [ .inf, -.Inf, +.INF, .NAN ]''');
     });
   });
 }