diff --git a/.eslintrc.json b/.eslintrc.json
index 24af0bf..ca3a390 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -6,6 +6,7 @@
 	},
 	"globals": {
 		"dataValues": false,
+		"module": false,
 		"util": false,
 		"wikibase": false
 	},
diff --git a/.gitignore b/.gitignore
index 140fd58..3031066 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 vendor/
 node_modules/
+
+.idea/
diff --git a/.travis.yml b/.travis.yml
index fdddf6c..ff65237 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ before_script:
   - nvm install 4
 
 script:
-  - npm install && npm run eslint
+  - npm install && npm test
 
 notifications:
   irc:
diff --git a/karma.conf.js b/karma.conf.js
new file mode 100644
index 0000000..7ed3647
--- /dev/null
+++ b/karma.conf.js
@@ -0,0 +1,44 @@
+module.exports = function ( config ) {
+	config.set( {
+		frameworks: [ 'qunit' ],
+
+		files: [
+			'node_modules/jquery/dist/jquery.js',
+
+			// TODO: install JS dependencies using npm
+			'node_modules/wikibase-data-values/lib/util/util.inherit.js',
+			'node_modules/wikibase-data-values/src/dataValues.js',
+			'node_modules/wikibase-data-values/src/DataValue.js',
+			'node_modules/wikibase-data-values/src/values/StringValue.js',
+			'node_modules/wikibase-data-values/src/values/UnDeserializableValue.js',
+			'node_modules/wikibase-data-model/src/__namespace.js',
+			'node_modules/wikibase-data-model/src/GroupableCollection.js',
+			'node_modules/wikibase-data-model/src/Group.js',
+			'node_modules/wikibase-data-model/src/Snak.js',
+			'node_modules/wikibase-data-model/src/Set.js',
+			'node_modules/wikibase-data-model/src/List.js',
+			'node_modules/wikibase-data-model/src/*.js',
+
+			'src/__namespace.js',
+			'src/Serializers/Serializer.js',
+			'src/Serializers/*.js',
+			'src/SerializerFactory.js',
+			'src/StrategyProvider.js',
+			'src/Deserializers/Deserializer.js',
+			'src/Deserializers/*.js',
+			'src/DeserializerFactory.js',
+			'tests/MockEntity.js',
+			'tests/MockEntity.tests.js',
+			'tests/StrategyProvider.tests.js',
+			'tests/SerializerFactory.tests.js',
+			'tests/Serializers/*.js',
+			'tests/Deserializers/*.js',
+			'tests/DeserializerFactory.tests.js'
+		],
+
+		port: 9876,
+
+		logLevel: config.LOG_INFO,
+		browsers: [ 'PhantomJS' ]
+	} );
+};
diff --git a/package.json b/package.json
index a8c7d89..8dbc585 100644
--- a/package.json
+++ b/package.json
@@ -23,15 +23,26 @@
     "lib": "src",
     "test": "tests"
   },
-  "devDependencies": {
-    "eslint": "^3.19.0",
-    "eslint-config-wikimedia": "0.4.0"
-  },
-  "scripts": {
-    "eslint": "eslint ."
+  "support": {
+    "url": "https://phabricator.wikimedia.org/"
   },
   "dependencies": {
+    "jquery": "^3.2.1",
     "wikibase-data-model": "^4.0.0",
     "wikibase-data-values": "^0.10.0"
+  },
+  "devDependencies": {
+    "eslint": "^3.19.0",
+    "eslint-config-wikimedia": "0.4.0",
+    "karma": "^1.7.1",
+    "karma-cli": "^1.0.1",
+    "karma-phantomjs-launcher": "^1.0.4",
+    "karma-qunit": "^1.2.1",
+    "qunit": "^1.0.0"
+  },
+  "scripts": {
+    "test": "npm run eslint && npm run run-tests",
+    "eslint": "eslint .",
+    "run-tests": "karma start --single-run"
   }
 }
diff --git a/src/__namespace.js b/src/__namespace.js
index 7874cf3..c279ba1 100644
--- a/src/__namespace.js
+++ b/src/__namespace.js
@@ -1,4 +1,5 @@
 /**
  * @ignore
  */
+window.wikibase = window.wikibase || {};
 wikibase.serialization = wikibase.serialization || {};