Always produce an instance

lib/firmata.js

@@ -416,14 +416,19 @@ SYSEX_RESPONSE[SERIAL_MESSAGE] = function(board) {
  * @property currentBuffer An array holding the current bytes received from the arduino.
  * @property {SerialPort} sp The serial port object used to communicate with the arduino.
  */
-function Board(port, options, callback) {
-  Emitter.call(this);
 
+function Board(port, options, callback) {
   if (typeof options === "function" || typeof options === "undefined") {
     callback = options;
     options = {};
   }
 
+  if (!(this instanceof Board)) {
+    return new Board(port, options, callback);
+  }
+
+  Emitter.call(this);
+
   var board = this;
   var defaults = {
     reportVersionTimeout: 5000,

test/firmata.test.js

@@ -355,6 +355,34 @@ describe("Board: data handling", function() {
   });
 });
 
+describe("Board: initialization", function() {
+  it("Always returns a Board instance", function(done) {
+    var boards = [
+      new Board("/path/to/fake1"),
+      Board("/path/to/fake2"),
+    ];
+
+    boards.forEach(function(board) {
+      assert.equal(board instanceof Board, true);
+    });
+
+    done();
+  });
+
+  it("Is a subclass of EventEmitter", function(done) {
+
+    var boards = [
+      new Board("/path/to/fake1"),
+      Board("/path/to/fake2"),
+    ];
+
+    boards.forEach(function(board) {
+      assert.equal(board instanceof Emitter, true);
+    });
+    done();
+  });
+});
+
 describe("Board: lifecycle", function() {
 
   var SerialPort = sandbox.spy(com, "SerialPort");