Add JavaScript mraaStub project

Signed-off-by: David Antler <david.a.antler@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

jsstub/test/index.js

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+var expect = require('expect.js');
+var m = require('../index');
+var LightBulb = require('./lightbulb');
+
+describe('LightBulb', function() {
+
+    /** Model the internal data of LightBulb as a buffer */
+    var bufferFullBrightness = new Buffer(
+       [ 'N',   // Four bytes allocated for name
+         'a',
+         'm',
+         'e',
+          95    // One byte allocated for brightness. Stuff in '95' value!
+       ]);
+
+    it('getBrightness() function should return 95', function() {
+
+        // Create a fake I2c bus based on the 'full brightness' data model
+        var testI2cBus = new m.I2c(0);
+        testI2cBus._setRegisterMapInternal(bufferFullBrightness);
+
+        // Create a new LightBulb that opens the testI2cBus, instead of a real
+        // mraa I2c bus.
+        var lightBulbI2c = new LightBulb(testI2cBus);
+
+        // presumably getBrightness will gather data from I2C and get '95'
+        var brightness = lightBulbI2c.getBrightness();
+
+        expect(brightness).to.be(95);
+    })
+});
+

jsstub/test/lightbulb.js

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+/**
+* @fileoverview Implementation of a LightBulb class abstraction
+*
+*/
+
+module.exports = (function() {
+    "use strict";
+    var m = require('../index');
+
+    /**
+     * Constructor for a new LightBulb
+     * @class LightBulb
+     *
+     * @classdesc This class abstracts access to the control and data registers
+     * on an imaginary lightbulb.
+     * @param {Object} A libmraa I2c object, initialized
+     */
+    function LightBulb (i2cInterface) {
+        var self = this;
+        self._i2cInterface = i2cInterface;
+
+        self.getBrightness = function() {
+            // Presume our brightness data is one byte at offset 4
+            return self._i2cInterface.readReg(4);
+        }
+
+        return self;
+    }
+
+    return LightBulb;
+})();
+