diff --git a/CHANGELOG.md b/CHANGELOG.md
index a01840c9..ec34b4e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,8 +19,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Russian Translation
 - Afrikaans Translation
 - Add postinstall script to notify user that MagicMirror installed successfully despite warnings from NPM.
+- Init tests using mocha.
 - Option to use RegExp in Calendar's titleReplace.
 
+
 ### Fixed
 - Update .gitignore to not ignore default modules folder.
 - Remove white flash on boot up.
diff --git a/js/module.js b/js/module.js
index 67305a9c..b12f6cd4 100644
--- a/js/module.js
+++ b/js/module.js
@@ -415,3 +415,7 @@ Module.register = function (name, moduleDefinition) {
 	Log.log("Module registered: " + name);
 	Module.definitions[name] = moduleDefinition;
 };
+
+exports._test = {
+	cmpVersions: cmpVersions
+}
diff --git a/package.json b/package.json
index 5b85915a..0cc8f497 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "main": "js/electron.js",
   "scripts": {
     "start": "electron js/electron.js",
-    "postinstall": "sh installers/postinstall/postinstall.sh"
+    "postinstall": "sh installers/postinstall/postinstall.sh",
+	"test": "./node_modules/mocha/bin/mocha tests --recursive"
   },
   "repository": {
     "type": "git",
@@ -27,12 +28,14 @@
   },
   "homepage": "https://github.com/MichMich/MagicMirror#readme",
   "devDependencies": {
+    "chai": "^3.5.0",
     "grunt": "latest",
     "grunt-eslint": "latest",
     "grunt-jsonlint": "latest",
     "grunt-markdownlint": "^1.0.13",
     "grunt-stylelint": "latest",
     "grunt-yamllint": "latest",
+    "mocha": "^3.2.0",
     "stylelint-config-standard": "latest",
     "time-grunt": "latest"
   },
diff --git a/tests/functions/compare-version.js b/tests/functions/compare-version.js
new file mode 100644
index 00000000..77efa422
--- /dev/null
+++ b/tests/functions/compare-version.js
@@ -0,0 +1,21 @@
+var chai = require('chai');
+var expect = chai.expect;
+var classMM = require('../../js/class.js'); // require for load module.js
+var moduleMM =  require('../../js/module.js')
+
+describe('Test function cmpVersions into js/module.js', function() {
+
+	it('Should be return -1 ', function() {
+		expect(moduleMM._test.cmpVersions('2.1', '2.2')).to.equal(-1);
+	});
+
+	it('Should be return 0 ', function() {
+		expect(moduleMM._test.cmpVersions('2.2', '2.2')).to.equal(0);
+	});
+
+	it('Should be return 1', function() {
+		expect(moduleMM._test.cmpVersions('1.1', '1.0')).to.equal(1);
+	});
+
+});
+