test large inputs for sha1 and sha256, also remove unused import

test/sha256_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 tag to allow Dartium to run the tests.
 library sha256_test;
 
 import "package:test/test.dart";
 import "package:crypto/crypto.dart";
+import 'very_long_input.dart';
 
 part 'sha256_long_test_vectors.dart';
 part 'sha256_short_test_vectors.dart';
 
 void main() {
   test('expected values', _testExpectedValues);
   test('invalid use', _testInvalidUse);
   test('repeated digest', _testRepeatedDigest);
   test('long inputs',
       () => _testStandardVectors(sha256_long_inputs, sha256_long_mds));
   test('short inputs',
       () => _testStandardVectors(sha256_short_inputs, sha256_short_mds));
+  test('input bit length greater than 32 bits', () {
+    veryLongInput(new SHA256(), 1000000000,
+        'bc17f06f9d9b5f6f79ca189a1772b1a3a38d6e40c45bec50f9c4f28144efddca');
+  });
 }
 
 void _testExpectedValues() {
   var expectedValues = const [
     'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855',
     '6e340b9cffb37a989ca544e6bb780a2c78901d3fb33738768511a30617afa01d',
     'b413f47d13ee2fe6c845b2ee141af81de858df4ec549a58b7970bb96645bc8d2',
     'ae4b3280e56e2faf83f414a6e3dabe9d5fbe18976544c05fed121accb85b53fc',
     '054edec1d0211f624fed0cbca9d4f9400b0e491c43742af2c5b0abebf0c990d8',
     '08bb5e5d6eaac1049ede0893d30ed022b1a4d9b5b48db414871f51c9cb35283d',
@@ skipping 270 matching lines @@
 }
 
 void _testStandardVectors(inputs, mds) {
   for (var i = 0; i < inputs.length; i++) {
     var hash = new SHA256();
     hash.add(inputs[i]);
     var d = hash.close();
     expect(mds[i], CryptoUtils.bytesToHex(d), reason: '$i');
   }
 }