fix: prevent the creation of empty named selections (#2063)

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: RobPasMue

doc/changelog.d/2063.fixed.md

@@ -0,0 +1 @@
+Prevent the creation of empty named selections

src/ansys/geometry/core/designer/design.py

@@ -629,7 +629,20 @@ def create_named_selection(
         -------
         NamedSelection
             Newly created named selection that maintains references to all target entities.
+
+        Raises
+        ------
+        ValueError
+            If no entities are provided for the named selection. At least
+            one of the optional parameters must be provided.
         """
+        # Verify that at least one entity is provided
+        if not any([bodies, faces, edges, beams, design_points]):
+            raise ValueError(
+                "At least one of the following must be provided: "
+                "bodies, faces, edges, beams, or design_points."
+            )
+
         named_selection = NamedSelection(
             name,
             self,

tests/integration/test_design.py

@@ -490,6 +490,22 @@ def test_named_selections(modeler: Modeler):
     assert len(design.named_selections) == 3
 
 
+def test_empty_named_selection(modeler: Modeler):
+    """Test for verifying the creation of an empty ``NamedSelection``."""
+    # Create your design on the server side
+    design = modeler.create_design("EmptyNamedSelection_Test")
+
+    # Attempting to create an empty NamedSelection raises an error
+    with pytest.raises(ValueError, match="At least one of the following must be provided:"):
+        design.create_named_selection("EmptyNS")
+
+    # Make sure that passing empty lists also raises an error
+    with pytest.raises(ValueError, match="At least one of the following must be provided:"):
+        design.create_named_selection(
+            "EmptyNS2", bodies=[], faces=[], edges=[], beams=[], design_points=[]
+        )
+
+
 def test_named_selection_contents(modeler: Modeler):
     """Test for verifying the correct contents of a ``NamedSelection``."""
     # Create your design on the server side