diff --git a/test/classes/test_complex.py b/test/classes/test_complex.py
index c521962a..7851a76e 100644
--- a/test/classes/test_complex.py
+++ b/test/classes/test_complex.py
@@ -2,9 +2,15 @@
 
 import pytest
 
-from toponetx.classes.complex import Complex
+from toponetx.classes.cell import Cell
+from toponetx.classes.cell_complex import CellComplex
+from toponetx.classes.colored_hypergraph import ColoredHyperGraph
+from toponetx.classes.complex import Atom, Complex
 from toponetx.classes.hyperedge import HyperEdge
+from toponetx.classes.path import Path
+from toponetx.classes.path_complex import PathComplex
 from toponetx.classes.simplex import Simplex
+from toponetx.classes.simplicial_complex import SimplicialComplex
 
 
 class TestAtom:
@@ -26,6 +32,68 @@ def test_atoms_equal(self):
 class TestComplex:
     """Test the Complex abstract class."""
 
+    complex_classes = (CellComplex, ColoredHyperGraph, PathComplex, SimplicialComplex)
+    atom_classes = (Cell, HyperEdge, Path, Simplex)
+    add_atom_method = ("add_cell", "add_cell", "add_path", "add_simplex")
+
+    @pytest.mark.parametrize(
+        "complex_class,atom_class,add_method",
+        zip(complex_classes, atom_classes, add_atom_method, strict=True),
+    )
+    def test_add_atom_with_attribute(
+        self, complex_class: type[Complex], atom_class: type[Atom], add_method: str
+    ) -> None:
+        """Test adding an atom with an attribute.
+
+        Parameters
+        ----------
+        complex_class : type[Complex]
+            The complex class to test.
+        atom_class : type[Atom]
+            The atom class to test.
+        add_method : str
+            The name of the method to add the atom to the complex.
+        """
+        complex_ = complex_class()
+        atom1 = atom_class((1, 2, 3), weight=1)
+        atom2 = atom_class((2, 3, 4))
+        add_func = getattr(complex_, add_method)
+
+        add_func(atom1)
+        assert atom1 in complex_
+        assert complex_[atom1]["weight"] == 1
+
+        add_func(atom2, weight=2)
+        assert atom2 in complex_
+        assert complex_[atom2]["weight"] == 2
+
+    @pytest.mark.parametrize(
+        "complex_class,atom_class,add_method",
+        zip(complex_classes, atom_classes, add_atom_method, strict=True),
+    )
+    def test_add_atom_attribute_precedence(
+        self, complex_class: type[Complex], atom_class: type[Atom], add_method: str
+    ) -> None:
+        """Test that explicitly added attributes take precedence.
+
+        Parameters
+        ----------
+        complex_class : type[Complex]
+            The complex class to test.
+        atom_class : type[Atom]
+            The atom class to test.
+        add_method : str
+            The name of the method to add the atom to the complex.
+        """
+        complex_ = complex_class()
+        atom = atom_class((1, 2, 3), weight=1)
+
+        add_func = getattr(complex_, add_method)
+        add_func(atom, weight=2)
+
+        assert atom in complex_
+        assert complex_[atom]["weight"] == 2
+
     def test_complex_is_abstract(self):
         """Test if the Complex abstract class is abstract."""
         with pytest.raises(TypeError):
diff --git a/toponetx/classes/path_complex.py b/toponetx/classes/path_complex.py
index 85cf7e44..00b816c9 100644
--- a/toponetx/classes/path_complex.py
+++ b/toponetx/classes/path_complex.py
@@ -213,9 +213,7 @@ def add_path(self, path: Hashable | Sequence[Hashable] | Path, **attr) -> None:
         """
         new_paths = set()
         if isinstance(path, int | str):
-            path = [
-                path,
-            ]
+            path = [path]
         if isinstance(path, list | tuple | Path):
             if not isinstance(path, Path):  # path is a list or tuple
                 path_ = tuple(path)
@@ -1095,19 +1093,17 @@ def _update_attributes(self, path, **attr):
         **attr : keyword arguments
             The attributes to update.
         """
-        path_ = path.elements if isinstance(path, Path) else tuple(path)
-        if isinstance(path, Path):  # update attributes for PathView() and _G
-            self._path_set.faces_dict[len(path_) - 1][path_].update(path._attributes)
-            if len(path_) == 1:
-                self._G.add_node(path_[0], **path._attributes)
-            elif len(path_) == 2:
-                self._G.add_edge(path_[0], path_[1], **path._attributes)
+        if isinstance(path, Path):
+            path_ = path.elements
+            attr = path._attributes | attr
         else:
-            self._path_set.faces_dict[len(path_) - 1][path_].update(attr)
-            if len(path_) == 1:
-                self._G.add_node(path_[0], **attr)
-            elif len(path_) == 2:
-                self._G.add_edge(path_[0], path_[1], **attr)
+            path_ = tuple(path)
+
+        self._path_set.faces_dict[len(path_) - 1][path_].update(attr)
+        if len(path_) == 1:
+            self._G.add_node(path_[0], **attr)
+        elif len(path_) == 2:
+            self._G.add_edge(path_[0], path_[1], **attr)
 
     def __contains__(self, atom: Any) -> bool:
         """Check if an atom is in the path complex.