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diff --git a/src/ceph/src/ceph-volume/ceph_volume/tests/devices/lvm/test_prepare.py b/src/ceph/src/ceph-volume/ceph_volume/tests/devices/lvm/test_prepare.py
new file mode 100644
index 0000000..d46d33a
--- /dev/null
+++ b/src/ceph/src/ceph-volume/ceph_volume/tests/devices/lvm/test_prepare.py
@@ -0,0 +1,78 @@
+import pytest
+from ceph_volume.devices import lvm
+
+
+class TestLVM(object):
+
+    def test_main_spits_help_with_no_arguments(self, capsys):
+        lvm.main.LVM([]).main()
+        stdout, stderr = capsys.readouterr()
+        assert 'Use LVM and LVM-based technologies like dmcache to deploy' in stdout
+
+    def test_main_shows_activate_subcommands(self, capsys):
+        lvm.main.LVM([]).main()
+        stdout, stderr = capsys.readouterr()
+        assert 'activate ' in stdout
+        assert 'Discover and mount' in stdout
+
+    def test_main_shows_prepare_subcommands(self, capsys):
+        lvm.main.LVM([]).main()
+        stdout, stderr = capsys.readouterr()
+        assert 'prepare ' in stdout
+        assert 'Format an LVM device' in stdout
+
+
+class TestPrepareDevice(object):
+
+    def test_cannot_use_device(self):
+        with pytest.raises(RuntimeError) as error:
+            lvm.prepare.Prepare([]).prepare_device(
+                    '/dev/var/foo', 'data', 'asdf', '0')
+        assert 'Cannot use device (/dev/var/foo)' in str(error)
+        assert 'A vg/lv path or an existing device is needed' in str(error)
+
+class TestPrepare(object):
+
+    def test_main_spits_help_with_no_arguments(self, capsys):
+        lvm.prepare.Prepare([]).main()
+        stdout, stderr = capsys.readouterr()
+        assert 'Prepare an OSD by assigning an ID and FSID' in stdout
+
+    def test_main_shows_full_help(self, capsys):
+        with pytest.raises(SystemExit):
+            lvm.prepare.Prepare(argv=['--help']).main()
+        stdout, stderr = capsys.readouterr()
+        assert 'Use the filestore objectstore' in stdout
+        assert 'Use the bluestore objectstore' in stdout
+        assert 'A physical device or logical' in stdout
+
+
+class TestGetJournalLV(object):
+
+    @pytest.mark.parametrize('arg', ['', '///', None, '/dev/sda1'])
+    def test_no_journal_on_invalid_path(self, monkeypatch, arg):
+        monkeypatch.setattr(lvm.prepare.api, 'get_lv', lambda **kw: False)
+        prepare = lvm.prepare.Prepare([])
+        assert prepare.get_lv(arg) is None
+
+    def test_no_journal_lv_found(self, monkeypatch):
+        # patch it with 0 so we know we are getting to get_lv
+        monkeypatch.setattr(lvm.prepare.api, 'get_lv', lambda **kw: 0)
+        prepare = lvm.prepare.Prepare([])
+        assert prepare.get_lv('vg/lv') == 0
+
+
+class TestActivate(object):
+
+    def test_main_spits_help_with_no_arguments(self, capsys):
+        lvm.activate.Activate([]).main()
+        stdout, stderr = capsys.readouterr()
+        assert 'Activate OSDs by discovering them with' in stdout
+
+    def test_main_shows_full_help(self, capsys):
+        with pytest.raises(SystemExit):
+            lvm.activate.Activate(argv=['--help']).main()
+        stdout, stderr = capsys.readouterr()
+        assert 'optional arguments' in stdout
+        assert 'positional arguments' in stdout
+