def test_creation(self):
pmt = PlotMetricsTracker()
self.assertIsNone(pmt.getType(None))
with self.assertRaises(KeyError):
pmt.getType("type")
self.assertIsNone(pmt.getDataTypeKey())
pmt.setDataTypeKey("test data type")
self.assertEqual(pmt.getDataTypeKey(), "test data type")
