def test_fit_TransformerMixin(self):
scaler = StandardScaler()
wrapper = SKLearnWrapper(module=scaler)
self.assertFalse("mean_" in scaler.__dir__())
wrapper.fit(test=xr.DataArray([1, 2, 3, 4, 5]))
self.assertTrue("mean_" in scaler.__dir__())
self.assertIsNotNone(scaler.mean_)
