update readme

Author: Sebastian Gumprich

README.md

@@ -50,24 +50,20 @@ Further information is already available at [Deutsche Telekom (German)](http://w
 
 ## Local Testing
 
-For local testing you can use vagrant and Virtualbox of VMWare to run tests locally. You will have to install Virtualbox and Vagrant on your system. See [Vagrant Downloads](http://downloads.vagrantup.com/) for a vagrant package suitable for your system. For all our tests we use `test-kitchen`. If you are not familiar with `test-kitchen` please have a look at [their guide](http://kitchen.ci/docs/getting-started).
+The preferred way of locally testing the role is to use Docker. You will have to install Docker on your system. See [Get started](https://docs.docker.com/) for a Docker package suitable to for your system.
+
+You can also use vagrant and Virtualbox or VMWare to run tests locally. You will have to install Virtualbox and Vagrant on your system. See [Vagrant Downloads](http://downloads.vagrantup.com/) for a vagrant package suitable for your system. For all our tests we use `test-kitchen`. If you are not familiar with `test-kitchen` please have a look at [their guide](http://kitchen.ci/docs/getting-started).
 
 Next install test-kitchen:
 
 ```bash
 # Install dependencies
 gem install bundler
 bundle install
+```
 
-# Fetch tests
-bundle exec thor kitchen:fetch-remote-tests
-
-# download a MySQL-installation role
-ansible-galaxy install -p roles/ bennojoy.mysql
-
-# change password in MySQL-installation role to match the one from testing
-sed -i 's/foobar/iloverandompasswordsbutthiswilldo/g' roles/bennojoy.mysql/defaults/main.yml
-
+### Testing with Docker
+```
 # fast test on one machine
 bundle exec kitchen test default-ubuntu-1204
 
@@ -79,8 +75,19 @@ bundle exec kitchen create default-ubuntu-1204
 bundle exec kitchen converge default-ubuntu-1204
 ```
 
-For more information see [test-kitchen](http://kitchen.ci/docs/getting-started)
+### Testing with Virtualbox
+```
+# fast test on one machine
+KITCHEN_YAML=".kitchen.vagrant.yml" bundle exec kitchen test default-ubuntu-1404
+
+# test on all machines
+KITCHEN_YAML=".kitchen.vagrant.yml" bundle exec kitchen test
 
+# for development
+KITCHEN_YAML=".kitchen.vagrant.yml" bundle exec kitchen create default-ubuntu-1404
+KITCHEN_YAML=".kitchen.vagrant.yml" bundle exec kitchen converge default-ubuntu-1404
+```
+For more information see [test-kitchen](http://kitchen.ci/docs/getting-started)
 
 ## License and Author