Add Readme for testing

frontend/README.md

@@ -3,7 +3,7 @@
 After installing `npm` run
 
 ```
-npm install
+npm install --production
 ```
 
 Start the application in debug mode with
@@ -19,11 +19,16 @@ npm run build
 npm run start
 ```
 
+or 
+
+```
+npm build-start
+```
 
 ### Configuration
 
 Configuration has to be specified in `nuxt.config.js`. Setting the OpenID Connect paramaters
-correctly is essential for the login process to work
+correctly is essential for the login process to work.
 
 For details on how to configure authentication for external providers like GitHub or Facebook
 please refer to [the nuxt-oauth documentation](https://auth.nuxtjs.org/schemes/oauth2.html)
@@ -41,3 +46,20 @@ your browser to the URL.
 Note that you need to manually provide a cookie containing the Baerer token in case you don't
 access the api with a browser that automatically includes your cookie in the request.
 Passing the token as a GET or POST variable is not supported.
+
+
+### Run the tests
+
+Install the development dependencies with
+
+```
+npm install # without --production
+```
+Configure the application as described above.
+After creating a regular user and an admin user by assigning the role `admin` to the admin
+user and granting both users access to the `user-panel` application, configure the default
+values in `test/nightwatch_globals.js`. After that, run `npm test`.
+
+Note: E2E tests are executed with chromedriver. Make sure that you have a supported version
+of chromium installed. To downgrade the chromium version that is used in the tests, change
+the version number in `package.json` [accordingly](https://www.npmjs.com/package/chromedriver).