add test command

Author: rwieruch

.travis.yml

@@ -5,3 +5,6 @@ node_js:
 
 install:
   - npm install
+
+script:
+  - npm test

package.json

@@ -11,7 +11,7 @@
   "scripts": {
     "start": "react-scripts start",
     "build": "react-scripts build",
-    "test": "react-scripts test --env=jsdom",
+    "test": "react-scripts test --env=jsdom --passWithNoTests",
     "eject": "react-scripts eject"
   },
   "devDependencies": {