old_contents: 
  class TestOSD(object):
  
      def test_osds_are_all_collocated(self, node, Command):
          # TODO: figure out way to paramaterize node['vars']['devices'] for this test
          for device in node["vars"]["devices"]:
              assert Command.check_output("sudo blkid -s PARTLABEL -o value %s2" % device) in ["ceph journal", "ceph block"]
  
new_contents: 
  class TestOSD(object):
  
      def test_osds_are_all_collocated(self, node, host):
          # TODO: figure out way to paramaterize node['vars']['devices'] for this test
          for device in node["vars"]["devices"]:
              assert host.check_output("sudo blkid -s PARTLABEL -o value %s2" % device) in ["ceph journal", "ceph block"]
  
subject: update tests to use new host fixture