Add some basic unit tests with Jest

__tests__/driverfactory.js

@@ -0,0 +1,30 @@
+'use strict';
+
+let driverFactory, config;
+let { DriverFactory } = require( '../drivers/driverfactory' );
+
+let { Dummy } = require( '../drivers/dummy' );
+let { PimoroniUnicorn } = require( '../drivers/pimoroniunicorn' );
+
+beforeEach(() => {
+	driverFactory = new DriverFactory();
+	config = {
+		"driver": "dummy",
+		"matrix": {
+			"width": 16,
+			"height": 16,
+			"brightness": 1,
+			"flipHorizontal": false,
+			"flipVertical": false
+		}
+	};
+});
+
+test( 'Dummy driver to be properly created', () => {
+	expect( driverFactory.createFromConfig( config ) ).toBeInstanceOf( Dummy );
+} );
+
+test( 'Pimoroni Unicorn driver to be properly created', () => {
+	config.driver = "pimoroniunicorn";
+	expect( driverFactory.createFromConfig( config ) ).toBeInstanceOf( PimoroniUnicorn );
+} );

package.json

@@ -9,5 +9,15 @@
   "dependencies": {
     "pi-spi": "^1.0.2",
     "restify": "^6.3.4"
+  },
+  "devDependencies": {
+    "jest": "^22.0.4"
+  },
+  "scripts": {
+    "test": "jest"
+  },
+  "jest": {
+    "name": "pixdisp",
+    "testRegex": "(/__tests__/.[^_]*|(\\.|/)(test|spec))\\.jsx?$"
   }
 }