EMSUSD-134 unit test for parent to selection

Verify that the parent command with a single argument wil parent to the selection. Only works in future Maya versions.

test/lib/ufe/testParentCmd.py

@@ -811,6 +811,51 @@ def checkParentDone():
 
         checkParentDone()
 
+    @unittest.skipUnless(mayaUtils.mayaMajorVersion() > 2025, 'Requires Maya fixes only available in Maya greater than 2025.')
+    def testParentToSelection(self):
+        '''
+        Test that the parent command with a single argument will parent to the selection.
+        '''
+        # Create scene items for the cube and the cylinder.
+        shapeSegment = mayaUtils.createUfePathSegment(
+            "|mayaUsdProxy1|mayaUsdProxyShape1")
+
+        cylinderPath = ufe.Path(
+            [shapeSegment, usdUtils.createUfePathSegment("/cylinderXform")])
+        cylinderItem = ufe.Hierarchy.createItem(cylinderPath)
+
+        def verifyInitialSetup():
+            '''Verify that the cube is not a child of the cylinder.'''
+            cylHier = ufe.Hierarchy.hierarchy(cylinderItem)
+            cylChildren = cylHier.children()
+            self.assertEqual(len(cylChildren), 1)
+            self.assertNotIn("cubeXform", childrenNames(cylChildren))
+
+        verifyInitialSetup()
+
+        # Parent cube to cylinder by passing the cube but not the cylinder
+        # while the cylinder is selected.
+        cmds.select("|mayaUsdProxy1|mayaUsdProxyShape1,/cylinderXform")
+        cmds.parent("|mayaUsdProxy1|mayaUsdProxyShape1,/cubeXform")
+
+        def verifyCubeUnderCylinder():
+            '''Verify that the cube is under the cylinder.'''
+            cylHier = ufe.Hierarchy.hierarchy(cylinderItem)
+            cylChildren = cylHier.children()
+            self.assertEqual(len(cylChildren), 2)
+            self.assertIn("cubeXform", childrenNames(cylChildren))
+
+        # Confirm that the cube is now a child of the cylinder.
+        verifyCubeUnderCylinder()
+
+        # Undo: the cube is no longer a child of the cylinder.
+        cmds.undo()
+        verifyInitialSetup()
+
+        # Redo: the cube is again a child of the cylinder.
+        cmds.redo()
+        verifyCubeUnderCylinder()
+
     def testParentToProxyShape(self):
 
         # Load a file with a USD hierarchy at least 2-levels deep.