actually initialize the serialport without mocks in tests

test/serialport-c.js

@@ -0,0 +1,28 @@
+"use strict";
+
+var sinon = require("sinon");
+var chai = require('chai');
+var expect = chai.expect;
+
+describe('SerialPort', function () {
+  var sandbox;
+
+  beforeEach(function () {
+    sandbox = sinon.sandbox.create();
+  });
+
+  afterEach(function () {
+    sandbox.restore();
+  });
+
+  describe('Initialization', function () {
+    it("Throws an error in callback when trying to open an invalid port", function (done) {
+      var SerialPort = require('../').SerialPort;
+      var port = new SerialPort('/dev/nullbad', function (err) {
+        chai.assert.isDefined(err, "didn't get an error");
+        done();
+      });
+    });
+  });
+
+});