Refactor tests and remove unused imports

- Cleaned up test files by removing unnecessary imports and unused parameters.
- Simplified test functions by eliminating redundant parameterization and consolidating logic.
- Updated test cases to directly use defined values instead of parameterized inputs where applicable.
- Enhanced readability and maintainability of the test code across various test files.

tests/tools/nodes/test_depth_surface_split.py

@@ -11,15 +11,14 @@ from tests.support.depth_surface import assert_closed, component_count, evaluate
 
 
 @pytest.mark.parametrize("mode", [0, 1])
-@pytest.mark.parametrize("split", [0.0, 0.5])
-def test_shell_walls_directly_connect_caps(mode, split):
+def test_shell_walls_directly_connect_caps(mode):
     from anyimage.common.object import modifier_input_identifier, set_modifier_input
 
     obj, set_value = surface(resolution=4)
     obj.data.attributes.new("o_balloon", "FLOAT", "POINT").data.foreach_set(
         "value", np.full(len(obj.data.vertices), 0.3)
     )
-    set_value("Depth Split", split)
+    set_value("Depth Split", 0.5)
     front, faces = evaluated(obj)
     edges = Counter(tuple(sorted((a, b))) for face in faces for a, b in zip(face, (*face[1:], face[0])))
     boundary_count = sum(count == 1 for count in edges.values())
@@ -47,10 +46,9 @@ def test_shell_walls_directly_connect_caps(mode, split):
 
 
 @pytest.mark.parametrize("thickness", [0.1, 1.4])
-@pytest.mark.parametrize("split", [0.0, 0.5])
-def test_surface_caps_and_segmented_walls_are_connected(thickness, split):
+def test_surface_caps_and_segmented_walls_are_connected(thickness):
     obj, set_value = surface()
-    set_value("Depth Split", split)
+    set_value("Depth Split", 0.5)
     set_value("Thickness", thickness)
     coords, faces = evaluated(obj)
     assert np.isfinite(coords).all()
@@ -231,15 +229,14 @@ def test_source_surface_sampling_preserves_depth_on_side_walls():
 
 
 @pytest.mark.parametrize("thickness", [0.0, 0.2])
-@pytest.mark.parametrize("split", [0.0, 0.5])
-def test_temporary_fields_are_removed_and_user_attributes_survive(thickness, split):
+def test_temporary_fields_are_removed_and_user_attributes_survive(thickness):
     obj, set_value = surface()
     obj.data.attributes.new("o_depth_probe", "FLOAT", "POINT")
     attribute = obj.data.attributes.new("o_user_weight", "FLOAT", "POINT")
     obj.data.attributes.new(".o_anyimage_user_weight", "FLOAT", "POINT")
     for value in attribute.data:
         value.value = 0.75
-    set_value("Depth Split", split)
+    set_value("Depth Split", 0.5)
     set_value("Thickness", thickness)
     result = obj.evaluated_get(bpy.context.evaluated_depsgraph_get())
     mesh = result.to_mesh()