diff --git a/.jshintrc b/.jshintrc
new file mode 100644
index 0000000..018b46f
--- /dev/null
+++ b/.jshintrc
@@ -0,0 +1,17 @@
+{
+  "curly": true,
+  "eqeqeq": true,
+  "immed": true,
+  "latedef": true,
+  "newcap": true,
+  "noarg": true,
+  "sub": true,
+  "undef": true,
+  "unused": true,
+  "boss": true,
+  "eqnull": true,
+  "browser": true,
+  "globalstrict": true,
+  "es3": true,
+  "globals": {}
+}
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..7b9fbae
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,9 @@
+language: node_js
+node_js:
+  - "0.10"
+notifications:
+  email:
+    recipients:
+      - thomas.parisot@bbc.co.uk
+    on_failure: change
+    on_success: never
diff --git a/Imager.js b/Imager.js
index ffa500e..6786c7b 100644
--- a/Imager.js
+++ b/Imager.js
@@ -117,7 +117,7 @@
             gif.setAttribute('data-src', element.getAttribute('data-src'));
 
         element.parentNode.replaceChild(gif, element);
-    }
+    };
 
     Imager.prototype.changeDivsToEmptyImages = function(){
         var divs = this.divs,
@@ -152,8 +152,7 @@
     };
 
     Imager.prototype.checkImagesNeedReplacing = function(){
-        var self = this,
-            images = $(this.className),
+        var images = $(this.className),
             i = images.length,
             currentImage;
 
diff --git a/karma.conf.js b/karma.conf.js
new file mode 100644
index 0000000..56b1fc4
--- /dev/null
+++ b/karma.conf.js
@@ -0,0 +1,69 @@
+// Karma configuration
+// Generated on Tue Oct 29 2013 11:45:20 GMT+0000 (GMT)
+
+module.exports = function(config) {
+  config.set({
+
+    // base path, that will be used to resolve files and exclude
+    basePath: '',
+
+
+    // frameworks to use
+    frameworks: ['mocha', 'chai'],
+
+
+    // list of files / patterns to load in the browser
+    files: [
+      'Imager.js',
+      'test/unit/**/*.js'
+    ],
+
+
+    // list of files to exclude
+    exclude: [
+
+    ],
+
+
+    // test results reporter to use
+    // possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
+    reporters: ['progress'],
+
+
+    // web server port
+    port: 9876,
+
+
+    // enable / disable colors in the output (reporters and logs)
+    colors: true,
+
+
+    // level of logging
+    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
+    logLevel: config.LOG_INFO,
+
+
+    // enable / disable watching file and executing tests whenever any file changes
+    autoWatch: true,
+
+
+    // Start these browsers, currently available:
+    // - Chrome
+    // - ChromeCanary
+    // - Firefox
+    // - Opera (has to be installed with `npm install karma-opera-launcher`)
+    // - Safari (only Mac; has to be installed with `npm install karma-safari-launcher`)
+    // - PhantomJS
+    // - IE (only Windows; has to be installed with `npm install karma-ie-launcher`)
+    browsers: ['PhantomJS'],
+
+
+    // If browser does not capture in given timeout [ms], kill it
+    captureTimeout: 60000,
+
+
+    // Continuous Integration mode
+    // if true, it capture browsers, run tests and exit
+    singleRun: false
+  });
+};
diff --git a/package.json b/package.json
index 087b717..d310a20 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,8 @@
   "description": "Imager.js is an alternative solution to the issue of how to handle responsive image loading, created by developers at BBC News.",
   "private": true,
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jshint Imager.js && karma start --single-run",
+    "test-watch": "karma start"
   },
   "repository": {
     "type": "git",
@@ -25,6 +26,20 @@
   "gitHead": "8d192cf0224a705e463b4dca18041168d491a6e9",
   "devDependencies": {
     "grunt": "~0.4.1",
-    "grunt-responsive-images": "0.0.3"
+    "grunt-responsive-images": "0.0.3",
+    "karma-chai": "0.0.2",
+    "karma-mocha": "~0.1.0",
+    "chai": "~1.8.1",
+    "mocha": "~1.13.0",
+    "karma-phantomjs-launcher": "~0.1.0",
+    "karma-script-launcher": "~0.1.0",
+    "karma-chrome-launcher": "~0.1.0",
+    "karma-firefox-launcher": "~0.1.0",
+    "karma-html2js-preprocessor": "~0.1.0",
+    "karma-jasmine": "~0.1.3",
+    "karma-requirejs": "~0.1.0",
+    "karma-coffee-preprocessor": "~0.1.0",
+    "karma": "~0.10.4",
+    "jshint": "~2.3.0"
   }
 }
diff --git a/test/unit/core.js b/test/unit/core.js
new file mode 100644
index 0000000..c612bc2
--- /dev/null
+++ b/test/unit/core.js
@@ -0,0 +1,19 @@
+'use strict';
+
+describe('Imager.js', function(){
+  describe('constructor', function(){
+
+    it('should initialise without arguments', function(done){
+      var imgr = new Imager();
+
+      setTimeout(function(){
+        expect(imgr.initialized).to.be.true;
+        expect(imgr.scrolled).to.be.false;
+        expect(imgr.cache).to.be.empty;
+
+        done();
+      }, 100);
+    });
+
+  });
+});
\ No newline at end of file