ceph_volume: fix unit tests

Fix the container_binary to use by mocking the CEPH_CONTAINER_BINARY env
variable.

Signed-off-by: Sébastien Han <seb@redhat.com>

library/ceph_volume.py

@@ -273,7 +273,7 @@ def batch(module, container_image):
     journal_size = module.params.get('journal_size', None)
     block_db_size = module.params.get('block_db_size', None)
     dmcrypt = module.params.get('dmcrypt', None)
-    osds_per_device = module.params.get('osds_per_device', None)
+    osds_per_device = module.params.get('osds_per_device', 1)
 
     if not osds_per_device:
         fatal('osds_per_device must be provided if action is "batch"', module)

library/test_ceph_volume.py

@@ -1,7 +1,10 @@
 from . import ceph_volume
 from ansible.compat.tests.mock import MagicMock
+import mock
+import os
 
 
+@mock.patch.dict(os.environ, {'CEPH_CONTAINER_BINARY': 'docker'})
 class TestCephVolumeModule(object):
 
     def test_data_no_vg(self):