TASK: Add jest as dependency

Author: Markus Günther

package.json

@@ -22,7 +22,8 @@
   ],
   "dependencies": {
     "hoist-non-react-statics": "^3.0.1",
-    "invariant": "^2.2.4"
+    "invariant": "^2.2.4",
+    "jest": "^23.4.2"
   },
   "devDependencies": {
     "@types/react": "^16.4.7",