Move unittest from lib to pkg.

tests/lib/i18n/date_time_format_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('date_time_format_test');
 
 #import('../../../pkg/i18n/intl.dart');
 #import('../../../pkg/i18n/date_format.dart');
-#import('../../../lib/unittest/unittest.dart');
+#import('../../../pkg/unittest/unittest.dart');
 #import('../../../pkg/i18n/date_time_patterns.dart');
 #import('../../../pkg/i18n/date_symbol_data.dart');
 
 #source('date_time_format_test_data.dart');
 
 /**
  * Tests the DateFormat library in dart.
  */
 
 var formatsToTest = const [
@@ skipping 266 matching lines @@
     var localPrinted = format.format(local);
     var parsed = format.parse(localPrinted);
     var parsedUTC = format.parseUTC(format.format(utc));
     var parsedOffset = parsedUTC.millisecondsSinceEpoch
         - parsed.millisecondsSinceEpoch;
     expect(parsedOffset, equals(offset));
     expect(utc.hour, equals(parsedUTC.hour));
     expect(local.hour, equals(parsed.hour));
     });
 }