Fix Centos6 tests by testing source install

.travis.yml

@@ -5,18 +5,23 @@ env:
   - distro: centos7
     init: /usr/lib/systemd/systemd
     run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
+    playbook: test.yml
   - distro: centos6
     init: /sbin/init
     run_opts: ""
+    playbook: test-source-install.yml
   - distro: ubuntu1604
     init: /lib/systemd/systemd
     run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
+    playbook: test.yml
   - distro: ubuntu1404
     init: /sbin/init
     run_opts: ""
+    playbook: test.yml
   - distro: ubuntu1204
     init: /sbin/init
     run_opts: ""
+    playbook: test.yml
 
 before_install:
   # Pull container.
@@ -31,14 +36,14 @@ script:
   - 'docker exec "$(cat ${container_id})" ansible-galaxy install -r /etc/ansible/roles/role_under_test/tests/requirements.yml'
 
   # Ansible syntax check.
-  - 'docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml --syntax-check'
+  - 'docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook} --syntax-check'
 
   # Test role.
-  - 'docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml'
+  - 'docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook}'
 
   # Test role idempotence.
   - idempotence=$(mktemp)
-  - docker exec "$(cat ${container_id})" ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml | tee -a ${idempotence}
+  - docker exec "$(cat ${container_id})" ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook} | tee -a ${idempotence}
   - >
     tail ${idempotence}
     | grep -q 'changed=0.*failed=0'

tests/test-source-install.yml

@@ -0,0 +1,14 @@
+---
+- hosts: all
+
+  vars:
+    certbot_install_from_source: yes
+
+  pre_tasks:
+    - name: Install cron (RedHat).
+      yum: name=cronie state=present
+      when: ansible_os_family == 'RedHat'
+
+  roles:
+    - geerlingguy.git
+    - role_under_test

tests/test.yml

@@ -16,5 +16,4 @@
       when: ansible_os_family == 'Debian'
 
   roles:
-    - geerlingguy.git
     - role_under_test