diff --git a/demo/index.html b/demo/index.html
index 438d74e..f9d113a 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -18,7 +18,7 @@
 		<h1>AngularJS Environment Plugin</h1>
 		<p>Let's see if it works</p>
 		<hr>
-		<h3>The current environment is <span style="color: blue;">{{environment}}</span> and this are the their vars</h3>
+		<h3>The current environment is <span style="color: blue;">{{environment}}</span> and this is their vars</h3>
 		<ul>
 			<li ng-repeat="(k, v) in vars"><code>{{k}} —→ {{v}}</code></li>
 		</ul>
diff --git a/karma.conf.js b/karma.conf.js
new file mode 100644
index 0000000..dde99ca
--- /dev/null
+++ b/karma.conf.js
@@ -0,0 +1,21 @@
+module.exports = function (config) {
+  config.set({
+    plugins: [
+      'karma-jasmine',
+      'karma-chrome-launcher'
+    ],
+    frameworks: ['jasmine'],
+    singleRun: false,
+    autoWatch: true,
+    colors: true,
+    reporters: ['dots'],
+    browsers: [process.env.TRAVIS ? 'Firefox' : 'Chrome'],
+    files: [
+      'node_modules/angular/angular.js',
+      'node_modules/angular-mocks/angular-mocks.js',
+      'src/angular-environment.js',
+      'test/*.js'
+    ],
+    logLevel: config.LOG_ERROR
+  });
+};
diff --git a/package.json b/package.json
index 0624e42..b2c618a 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,9 @@
   "version": "1.0.8",
   "description": "AngujarJS Environment Plugin",
   "main": "index.js",
+  "scripts": {
+    "test": "karma start --single-run"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/juanpablob/angular-environment.git"
@@ -28,6 +31,7 @@
   },
   "devDependencies": {
     "angular": ">1.2.0",
+    "angular-mocks": ">1.2.0",
     "gulp": "^3.9.0",
     "gulp-concat": "^2.6.0",
     "gulp-jshint": "^1.11.2",
@@ -37,6 +41,12 @@
     "gulp-strip-debug": "^1.1.0",
     "gulp-util": "^3.0.6",
     "gulp-watch": "^4.3.3",
+    "jasmine": "^2.6.0",
+    "jasmine-core": "^2.6.1",
+    "karma": "^1.6.0",
+    "karma-chrome-launcher": "^2.0.0",
+    "karma-firefox-launcher": "^1.0.1",
+    "karma-jasmine": "^1.1.0",
     "yargs": "^3.15.0"
   }
 }
diff --git a/test/angular-environment.js b/test/angular-environment.js
new file mode 100644
index 0000000..666745f
--- /dev/null
+++ b/test/angular-environment.js
@@ -0,0 +1,56 @@
+'use strict';
+
+describe('Test environment provider', function () {
+
+	var theEnvServiceProvider;
+	var envService;
+
+	beforeEach(function () {
+		// Initialise the provider by injecting it into a fake module's
+		// config block.
+		var fakeModule = angular.module('test.app.environment', []);
+		fakeModule.config(function (envServiceProvider) {
+			theEnvServiceProvider = envServiceProvider;
+		});
+		// Initialise the test.app injector.
+		module('environment', 'test.app.environment');
+		inject(function () {});
+		envService = theEnvServiceProvider.$get();
+
+		envService.config({
+			vars: {
+				development: {
+					backend: 'https://backend-dev/'
+				},
+				production: {
+					backend: 'https://backend/'
+				}
+			}
+		});
+	});
+
+	describe('with envService provider', function () {
+		it('tests the envService provider can be created', function () {
+			expect(theEnvServiceProvider).toBeDefined();
+		});
+
+		it('tests the default environment for envService is development', function () {
+			expect(envService.environment).toBe('development');
+			expect(envService.get()).toBe('development');
+		});
+
+		it('tests the environment for envService can be set', function () {
+			envService.set('production');
+			expect(envService.get()).toBe('production');
+		});
+
+		it('tests the config var for development environment is selected', function () {
+			expect(envService.read('backend')).toBe('https://backend-dev/');
+		});
+
+		it('tests the config var for production environment is selected', function () {
+			envService.set('production');
+			expect(envService.read('backend')).toBe('https://backend/');
+		});
+	});
+});