host: added test playbook

test/playbook-module-host.yml

+---
+# run with option -i localhost
+# need root permissions
+
+- name: host module testing
+  hosts: localhost
+  connection: local
+  gather_facts: no
+  sudo: yes
+
+  pre_tasks:
+    - name: backup /etc/hosts
+      command: cp /etc/hosts /etc/hosts.origin
+
+  post_tasks:
+    - name: restore /etc/hosts
+      command: cp /etc/hosts.origin /etc/hosts
+
+  tasks:
+    - name: test add a record
+      host: hostname=foobar ip=192.168.123.1
+      register: result
+      failed_when: not result.changed
+
+    - name: test error handling only hostname given on present
+      host: hostname=foobar
+      register: result
+      failed_when: result.changed
+
+    - name: test error handling only ip given on present
+      host: ip=192.168.123.1
+      register: result
+      failed_when: result.changed
+
+    - name: test record exists
+      host: hostname=foobar ip=192.168.123.1
+      register: result
+      failed_when: result.changed
+
+    - name: test remove record using hostname
+      host: hostname=foobar state=absent
+      register: result
+      failed_when: not result.changed
+
+    - name: test remove not existing record using hostname
+      host: hostname=foobar state=absent
+      register: result
+      failed_when: result.changed
+
+    - name: test add a record again
+      host: hostname=foobar ip=192.168.123.1
+      register: result
+      failed_when: not result.changed
+
+    - name: test remove record using ip
+      host: ip=192.168.123.1 state=absent
+      register: result
+      failed_when: not result.changed
+
+    - name: test remove not existing record using ip
+      host: ip=192.168.123.1 state=absent
+      register: result
+      failed_when: result.changed
+
+    - name: test add a record with alias
+      host: hostname=foobar ip=192.168.123.1 aliases=foobar.com,foobar.net
+      register: result
+      failed_when: not result.changed
+
+    - name: test add an existing record with alias
+      host: hostname=foobar ip=192.168.123.1 aliases=foobar.com,foobar.net
+      register: result
+      failed_when: result.changed
+
+    - name: test add an existing record with changed alias
+      host: hostname=foobar ip=192.168.123.1 aliases=foobar.net,foobar.com
+      register: result
+      failed_when: not result.changed
+
+    - name: test remove aliases from existing record
+      host: hostname=foobar ip=192.168.123.1
+      register: result
+      failed_when: not result.changed
+
+    - name: test add aliases for existing record
+      host: hostname=foobar ip=192.168.123.1 aliases=foobar.net,foobar.com
+      register: result
+      failed_when: not result.changed
+
+    - name: test change ip on existing record
+      host: hostname=foobar ip=192.168.123.2
+      register: result
+      failed_when: not result.changed
+
+    - name: test change hostname on existing record
+      host: hostname=barfoo ip=192.168.123.2
+      register: result
+      failed_when: not result.changed