Add Docstring to tests

Signed-off-by: Alexandre Ghelfi <alexandre.ghelfi@helsing.ai>

Author: Ghelfi

warp/tests/test_struct.py

@@ -911,6 +911,7 @@ def kernel_struct_property(s: StructWithProperty, out: wp.array(dtype=float)):
 
 
 def test_struct_property(test, device):
+    """Tests that structs with properties (getters) are supported."""
     s = StructWithProperty()
     s.value = 42.0
 
@@ -922,6 +923,7 @@ def test_struct_property(test, device):
 
 
 def test_struct_property_with_setter(test, device):
+    """Tests that structs with properties (setters) are not supported."""
     with test.assertRaisesRegex(TypeError, "Struct properties do not support setters"):
 
         @wp.struct