Make package mime strong clean

test/mime_type_test.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:math' as math;
 
 import 'package:test/test.dart';
 import 'package:mime/mime.dart';
 import 'package:mime/src/magic_number.dart';
 
@@ skipping 75 matching lines @@
       _expectMimeType('file', 'my-mime-type',
           headerBytes: [0x01, 0x02, 0x03], resolver: resolver);
       _expectMimeType('file', null,
           headerBytes: [0x01, 0x03, 0x03], resolver: resolver);
       _expectMimeType('file', 'my-mime-type',
           headerBytes: [0xFF, 0x02, 0x02], resolver: resolver);
     });
   });
 
   test('default magic number', () {
-    var actualMaxBytes = DEFAULT_MAGIC_NUMBERS.fold(0, (previous, magic) {
+    var actualMaxBytes = DEFAULT_MAGIC_NUMBERS.fold(0, (num previous, magic) {

[kevmoo, 2016/12/09 02:30:26]

should be int, right?

[keertip, 2016/12/09 02:43:40]

changed according to errror msg "Couldn't infer type parameter 'T'; 'dynamic'
must be of type 'num'. "

       return math.max(previous, magic.numbers.length);
     });
 
     expect(defaultMagicNumbersMaxLength, actualMaxBytes);
   });
 }