--- /dev/null
+import pytest
+from ceph_volume.devices import lvm
+
+
+class TestZap(object):
+
+ def test_main_spits_help_with_no_arguments(self, capsys):
+ lvm.zap.Zap([]).main()
+ stdout, stderr = capsys.readouterr()
+ assert 'Zaps the given logical volume or partition' in stdout
+
+ def test_main_shows_full_help(self, capsys):
+ with pytest.raises(SystemExit):
+ lvm.zap.Zap(argv=['--help']).main()
+ stdout, stderr = capsys.readouterr()
+ assert 'optional arguments' in stdout
+ assert 'positional arguments' in stdout