Added

- support for web worker. #11

Changed
- throw error if input type is incorrect.
- prevent webpack to require dependencies.

tests/worker-test.js

@@ -0,0 +1,21 @@
+(function () {
+  var cases = {
+    'd41d8cd98f00b204e9800998ecf8427e': '',
+    '9e107d9d372bb6826bd81d3542a419d6': 'The quick brown fox jumps over the lazy dog',
+    'e4d909c290d0fb1ca068ffaddf22cbd0': 'The quick brown fox jumps over the lazy dog.'
+  };
+
+  describe('#md5', function () {
+    Object.keys(cases).forEach(function (hash) {
+      it('should be equal', function (done) {
+        var worker = new Worker(WORKER);
+        worker.onmessage = function(event) {
+          expect(event.data).to.be(hash);
+          done();
+        };
+        worker.postMessage(SOURCE);
+        worker.postMessage(cases[hash]);
+      });
+    });
+  });
+})();