pkg/crypto: move tests to unittest package

pkg/crypto/lib/src/sha1.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.
 
 part of crypto;
 
 /**
  * SHA1 hash function implementation.
  */
 class SHA1 extends _HashBase {
+  final List<int> _w;
+
   // Construct a SHA1 hasher object.
   SHA1() : _w = new List(80), super(16, 5, true) {
     _h[0] = 0x67452301;
     _h[1] = 0xEFCDAB89;
     _h[2] = 0x98BADCFE;
     _h[3] = 0x10325476;
     _h[4] = 0xC3D2E1F0;
   }
 
   // Returns a new instance of this Hash.
@@ skipping 36 matching lines @@
       b = a;
       a = t & _MASK_32;
     }
 
     _h[0] = _add32(a, _h[0]);
     _h[1] = _add32(b, _h[1]);
     _h[2] = _add32(c, _h[2]);
     _h[3] = _add32(d, _h[3]);
     _h[4] = _add32(e, _h[4]);
   }
-
-  List<int> _w;
 }