Add documentation for integration tests

docs/en/development/integration-tests.md

@@ -0,0 +1,24 @@
+---
+title: Integration Tests
+subtitle: How to run integration tests
+displayToc: false
+---
+
+You can find the integration tests in the module **scm-it** (and a few still in **scm-webapp**). To run them,
+simply start maven with the profile `it`:
+
+```
+mvn install -Pit -DskipUnitTests -pl :scm-webapp,:scm-it
+```
+
+This will start a jetty server and execute all integration tests in the maven phase `integration-test` using the
+normal failsafe plugin. Integration tests are all classes ending with `ITCase` and are written using JUnit.
+
+To develop integration tests, you should start a local server with the **scm-integration-test-plugin**. This plugin is
+used as a way to introspect server internals. For example you can register event listeners here and access their
+triggers with a REST endpoint. Of course, this plugin is not and should not be installed in productive systems.
+You can start the server with this plugin using the following maven call:
+
+```
+mvn run -pl :scm-integration-test-plugin
+```

docs/en/navigation.yml

@@ -31,6 +31,7 @@
   - /development/definition-of-done/
   - /development/ui-dod/
   - /development/decision-table/
+  - /development/integration-tests/
 
 - section: Plugin Development
   entries: