Add basic docker_compose tests (#150)

* Add basic docker_compose tests.

* Add more constraints for Py 2.

* Try to install docker-compose from system packages.

* Another try.

* Some more tries.

* One more.

* Move task into block.

* Clean up constraints file.

* More adjustments.

* TEMP: add debug output

tests/integration/targets/docker_compose/tasks/main.yml

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+---
+####################################################################
+# WARNING: These are designed specifically for Ansible tests       #
+# and should not be used as examples of how to write Ansible roles #
+####################################################################
+
+# Create random name prefix (for containers, networks, ...)
+- name: Create random container name prefix
+  set_fact:
+    cname_prefix: "{{ 'ansible-test-%0x' % ((2**32) | random) }}"
+    cnames: []
+    dnetworks: []
+
+- debug:
+    msg: "Using container name prefix {{ cname_prefix }}"
+
+# Run the tests
+- block:
+  - include_tasks: run-test.yml
+    with_fileglob:
+    - "tests/*.yml"
+
+  always:
+  - name: "Make sure all containers are removed"
+    docker_container:
+      name: "{{ item }}"
+      state: absent
+      force_kill: yes
+    with_items: "{{ cnames }}"
+    diff: no
+  - name: "Make sure all networks are removed"
+    docker_network:
+      name: "{{ item }}"
+      state: absent
+      force: yes
+    with_items: "{{ dnetworks }}"
+    when: docker_py_version is version('1.10.0', '>=')
+    diff: no
+
+  when: has_docker_compose and docker_py_version is version('1.8.0', '>=') and docker_api_version is version('1.20', '>=')
+
+- fail: msg="Too old docker / docker-py version to run all docker_container tests!"
+  when: has_docker_compose and not(docker_py_version is version('3.5.0', '>=') and docker_api_version is version('1.25', '>=')) and (ansible_distribution != 'CentOS' or ansible_distribution_major_version|int > 6)

tests/integration/targets/docker_compose/tasks/run-test.yml

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+---
+- name: "Loading tasks from {{ item }}"
+  include_tasks: "{{ item }}"

tests/integration/targets/docker_compose/tasks/tests/start-stop.yml

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+---
+- name: Registering container name
+  set_fact:
+    pname: "{{ cname_prefix }}"
+    cname: "{{ cname_prefix ~ '-hi' }}"
+- name: Registering container name
+  set_fact:
+    cnames: "{{ cnames + [pname ~ '-' ~ cname] }}"
+    dnetworks: "{{ dnetworks + [pname ~ '_default'] }}"
+
+- name: Define service
+  set_fact:
+    test_service: |
+      version: '2'
+      services:
+        {{ cname }}:
+          image: "{{ docker_test_image_alpine }}"
+          command: '/bin/sh -c "sleep 10m"'
+
+####################################################################
+## Present #########################################################
+####################################################################
+
+- name: Present (check)
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: present
+    definition: "{{ test_service | from_yaml }}"
+  check_mode: yes
+  register: present_1
+
+- name: Present
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: present
+    definition: "{{ test_service | from_yaml }}"
+  register: present_2
+
+- name: Present (idempotent)
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: present
+    definition: "{{ test_service | from_yaml }}"
+  register: present_3
+
+- name: Present (idempotent check)
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: present
+    definition: "{{ test_service | from_yaml }}"
+  check_mode: yes
+  register: present_4
+
+- assert:
+    that:
+    - present_1 is changed
+    - present_2 is changed
+    - present_3 is not changed
+    - present_4 is not changed
+
+####################################################################
+## Absent ##########################################################
+####################################################################
+
+- name: Absent (check)
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: absent
+    definition: "{{ test_service | from_yaml }}"
+  check_mode: yes
+  register: absent_1
+
+- name: Absent
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: absent
+    definition: "{{ test_service | from_yaml }}"
+  register: absent_2
+
+- name: Absent (idempotent)
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: absent
+    definition: "{{ test_service | from_yaml }}"
+  register: absent_3
+
+- name: Absent (idempotent check)
+  docker_compose:
+    project_name: "{{ pname }}"
+    state: absent
+    definition: "{{ test_service | from_yaml }}"
+  check_mode: yes
+  register: absent_4
+
+- assert:
+    that:
+    - absent_1 is changed
+    - absent_2 is changed
+    - absent_3 is not changed
+    - absent_4 is not changed