molecule support

Signed-off-by: Stan Rudenko <stan@truera.com>

roles/prometheus/molecule/agentmode/converge.yml

@@ -0,0 +1,8 @@
+---
+- name: Run role
+  hosts: all
+  any_errors_fatal: true
+  roles:
+    - prometheus.prometheus.prometheus
+  vars:
+    prometheus_agent_mode: true

roles/prometheus/molecule/agentmode/molecule.yml

@@ -0,0 +1 @@
+---

roles/prometheus/molecule/agentmode/tests/test_default.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import yaml
+import testinfra.utils.ansible_runner
+import pytest
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+@pytest.fixture()
+def AnsibleDefaults():
+    with open("defaults/main.yml", 'r') as stream:
+        return yaml.full_load(stream)
+
+
+@pytest.mark.parametrize('file, content', [
+    ("/etc/systemd/system/prometheus.service",
+     "storage.agent.path=/var/lib/prometheus"),
+    ("/etc/systemd/system/prometheus.service",
+     "enable-feature=agent"),
+])
+def test_file_contents(host, file, content):
+    f = host.file(file)
+    assert f.exists
+    assert f.is_file
+    assert f.contains(content)
+
+
+def test_service(host):
+    s = host.service("prometheus")
+    assert s.is_running
+
+
+# # "/agent" page is available (http 200) when agent mode is enabled
+def test_agent_enabled(host):
+    output = host.check_output('curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:9090/agent')
+    assert '200' in output
+
+def test_socket(host):
+    s = host.socket("tcp://0.0.0.0:9090")
+    assert s.is_listening

tests/integration/targets/molecule-prometheus-agentmode/runme.sh

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+#!/usr/bin/env bash
+
+collection_root=$(pwd | grep -oP ".+\/ansible_collections\/\w+?\/\w+")
+source "$collection_root/tests/integration/molecule.sh"