MAYA-123753 - As a user, I would like my display layers to save with …

test/lib/mayaUsd/fileio/CMakeLists.txt

@@ -5,6 +5,7 @@ set(TEST_SCRIPT_FILES
     testImportChaser.py
     testImportWithNamespace.py
     testJobContextRegistry.py
+    testDisplayLayerSaveRestore.py
 
     # Once of the tests in this file requires UsdMaya (from the Pixar plugin). That test
     # will be skipped if not found (probably because BUILD_PXR_PLUGIN is off).

test/lib/mayaUsd/fileio/testDisplayLayerSaveRestore.py

@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+
+#
+# Copyright 2022 Autodesk
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import fixturesUtils
+
+from maya import cmds
+from maya import standalone
+
+import mayaUtils
+import mayaUsd
+import mayaUsd_createStageWithNewLayer
+
+import unittest
+
+class DisplayLayerSaveNonMaya(unittest.TestCase):
+    '''
+    Test saving/restoring a Display Layer that has non-Maya items.
+    '''
+
+    pluginsLoaded = False
+
+    @classmethod
+    def setUpClass(cls):
+        fixturesUtils.readOnlySetUpClass(__file__, loadPlugin=False)
+
+        if not cls.pluginsLoaded:
+            cls.pluginsLoaded = mayaUtils.isMayaUsdPluginLoaded()
+
+    @classmethod
+    def tearDownClass(cls):
+        standalone.uninitialize()
+
+    def setUp(self):
+        cmds.file(new=True, force=True)
+
+    def testDisplayLayerSaveAndRestore(self):
+        # First create Display Layer and find out if it has the Ufe member save/restore support.
+        cmds.createDisplayLayer(name='layer1', number=1, empty=True)
+        if 'ufeMembers' not in cmds.listAttr('layer1'):
+            self.skipTest('Maya DisplayLayer does not support saving/restoring Ufe (non-Maya) members.')
+
+        # Create some objects to add to layer.
+        cmds.CreatePolygonSphere()
+        cmds.CreatePolygonCube()
+
+        psPathStr = mayaUsd_createStageWithNewLayer.createStageWithNewLayer()
+        stage = mayaUsd.lib.GetPrim(psPathStr).GetStage()
+        stage.DefinePrim('/Sphere1', 'Sphere')
+        stage.DefinePrim('/Cube1', 'Cube')
+
+        # Add the two sphere (Maya and non-Maya) to the layer.
+        cmds.editDisplayLayerMembers('layer1', '|pSphere1', '|stage1|stageShape1,/Sphere1', noRecurse=True)
+
+        # Verify they are in layer.
+        layerObjs = cmds.editDisplayLayerMembers('layer1', query=True, fn=True)
+        self.assertTrue('|pSphere1' in layerObjs)
+        self.assertTrue('|stage1|stageShape1,/Sphere1' in layerObjs)
+
+        # Save the file with ufe display layer members.
+        tempMayaFile = 'displayLayerRestore.ma'
+        cmds.file(rename=tempMayaFile)
+        cmds.file(save=True, force=True, type='mayaAscii')
+
+        # Clear and reopen the file.
+        cmds.file(new=True, force=True)
+        cmds.file(tempMayaFile, open=True)
+
+        # Verify the two objecst (Maya and non-Maya are in layer).
+        layerObjs = cmds.editDisplayLayerMembers('layer1', query=True, fn=True)
+        self.assertTrue('|pSphere1' in layerObjs)
+        self.assertTrue('|stage1|stageShape1,/Sphere1' in layerObjs)
+
+        # We can also directly query the attribute value.
+        ufeAttr = cmds.getAttr('layer1.ufem')
+        self.assertTrue('|stage1|stageShape1,/Sphere1' in ufeAttr)