Update test function args

tests/test_unit/test_kinematics.py

@@ -226,9 +226,7 @@ def test_approximate_derivative_with_invalid_order(order):
             ),
         ],
     )
-    def test_cdist(
-        self, dim, pairs, expected_data, pairwise_distances_dataset
-    ):
+    def test_cdist(dim, pairs, expected_data, pairwise_distances_dataset):
         """Test the computation of pairwise distances with known values."""
         core_dim = "keypoints" if dim == "individuals" else "individuals"
         input_dataarray = pairwise_distances_dataset.position
@@ -249,7 +247,7 @@ def test_cdist(
             expected,
         )
 
-    def expected_pairwise_distances(self, pairs, input_ds, dim):
+    def expected_pairwise_distances(pairs, input_ds, dim):
         """Return a list of the expected data variable names
         for pairwise distances tests.
         """
@@ -284,15 +282,15 @@ def expected_pairwise_distances(self, pairs, input_ds, dim):
         ],
     )
     def test_compute_pairwise_distances_with_valid_pairs(
-        self, pairwise_distances_dataset, dim, pairs
+        pairwise_distances_dataset, dim, pairs
     ):
         """Test that the expected pairwise distances are computed
         for valid ``pairs`` inputs.
         """
         result = getattr(kinematics, f"compute_inter{dim[:-1]}_distances")(
             pairwise_distances_dataset.position, pairs=pairs
         )
-        expected_data_vars = self.expected_pairwise_distances(
+        expected_data_vars = expected_pairwise_distances(
             pairs, pairwise_distances_dataset, dim
         )
         if isinstance(result, dict):
@@ -301,7 +299,7 @@ def test_compute_pairwise_distances_with_valid_pairs(
             assert isinstance(result, xr.DataArray)
 
     def test_compute_pairwise_distances_with_invalid_dim(
-        self, pairwise_distances_dataset
+        pairwise_distances_dataset,
     ):
         """Test that an error is raised when an invalid dimension is passed."""
         with pytest.raises(ValueError):