pkg/mime: layout as mini-libraries

pkg/mime/test/mime_multipart_transformer_test.dart

Index: pkg/mime/test/mime_multipart_transformer_test.dart
diff --git a/pkg/mime/test/mime_multipart_transformer_test.dart b/pkg/mime/test/mime_multipart_transformer_test.dart
index 7d7bacaae3df67848624c60f15ffca924e45c2cc..20b4652cca7354853f2ee2dc8c698f3d4076fbbc 100644
--- a/pkg/mime/test/mime_multipart_transformer_test.dart
+++ b/pkg/mime/test/mime_multipart_transformer_test.dart
@@ -2,11 +2,12 @@
 // 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.
 
-import "package:unittest/unittest.dart";
-import "package:mime/mime.dart";
 import 'dart:async';
 import 'dart:math';
 
+import "package:unittest/unittest.dart";
+import "package:mime/mime.dart";
+
 void testParse(String message,
                String boundary,
                [List<Map> expectedHeaders,