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var md5 = require('./md5.js');
var assert = require('assert');

describe('md5', function () {

  it('should throw an error for an undefined value', function() {
    assert.throws(function() {
      md5(undefined);
    });
  });

  it('should allow the hashing of the string `undefined`', function() {
    assert.equal('5e543256c480ac577d30f76f9120eb74', md5('undefined'));
  });

  it('should throw an error for `null`', function() {
    assert.throws(function() {
      md5(null);
    });
  });

  it('should return the expected MD5 hash for "message"', function() {
    assert.equal('78e731027d8fd50ed642340b7c9a63b3', md5('message'));
  });

  it('should not return the same hash for random numbers twice', function() {
    var msg1 = Math.floor((Math.random() * 100000) + 1) + (new Date).getTime();
    var msg2 = Math.floor((Math.random() * 100000) + 1) + (new Date).getTime();

    if (msg1 !== msg2) {
      assert.notEqual(md5(msg1), md5(msg2));
    } else {
      assert.equal(md5(msg1), md5(msg1));
    }
  });

  it('should support Node.js Buffers', function() {
    var buffer = new Buffer('message áßäöü', 'utf8');

    assert.equal(md5(buffer), md5('message áßäöü'));
  })

  it('should be able to use a binary encoded string', function() {
    var hash1 = md5('abc', { asString: true });
    var hash2 = md5(hash1 + 'a', { asString: true, encoding : 'binary' });
    var hash3 = md5(hash1 + 'a', { encoding : 'binary' });
    assert.equal(hash3, '131f0ac52813044f5110e4aec638c169');
  });

  it('should support Uint8Array', function() {
    // Polyfills
    if (!Array.from) {
      Array.from = function(src, fn) {
        var result = new Array(src.length);
        for (var i = 0; i < src.length; ++i)
          result[i] = fn(src[i]);
        return result;
      };
    }
    if (!Uint8Array.from) {
      Uint8Array.from = function(src) {
        var result = new Uint8Array(src.length);
        for (var i = 0; i < src.length; ++i)
          result[i] = src[i];
        return result;
      };
    }

    var message = 'foobarbaz';
    var u8arr = Uint8Array.from(
      Array.from(message, function(c) { return c.charCodeAt(0); }));
    var u8aHash = md5(u8arr);
    assert.equal(u8aHash, md5(message));
  });
});