Add test cases to list docker containers on cloud nodes

Change-Id: I8ebe3d1fc03e397180dda79b493a9bee0d2b008f

tobiko/tests/scenario/cloud/test_nodes.py

@@ -17,6 +17,7 @@ from __future__ import absolute_import
 import testtools
 
 import tobiko
+from tobiko import docker
 from tobiko.shell import ip
 from tobiko.shell import ping
 from tobiko.shell import sh
@@ -59,3 +60,21 @@ class OpenstackNodesTest(testtools.TestCase):
                     tobiko.fail("Duplicate network namespace {!r} in node "
                                 "{!r}: {!r}, {!r}", namespace, node.name,
                                 other_ips, ips)
+
+    def test_controller_containers(self):
+        for node in self.topology.get_group('controller'):
+            self._test_node_containers(node=node)
+
+    def test_compute_containers(self):
+        for node in self.topology.get_group('compute'):
+            self._test_node_containers(node=node)
+
+    def _test_node_containers(self, node):
+        if docker.is_docker_running(ssh_client=node.ssh_client):
+            containers = docker.list_docker_containers(
+                client=node.docker_client)
+            self.assertNotEqual([], containers)
+            for container in containers:
+                self.assertEqual('running', container.status,
+                                 'container {!r} is not running'.format(
+                                     container.name))