Add unit tests for default material

lib/flowViewport/sceneIndex/fvpDefaultMaterialSceneIndex.cpp

@@ -31,13 +31,6 @@ namespace{
     static const TfToken purposes[] = { HdMaterialBindingsSchemaTokens->allPurpose };
 }
 
-TF_DEFINE_PRIVATE_TOKENS(
-    _tokens,
-    (UsdPreviewSurface)
-    (ND_standard_surface_surfaceshader)
-    (MayaDefaultMaterial)
-);
-
 // static
 DefaultMaterialSceneIndexRefPtr
 DefaultMaterialSceneIndex::New(

test/lib/mayaUsd/render/mayaToHydra/CMakeLists.txt

@@ -49,6 +49,7 @@ set(INTERACTIVE_TEST_SCRIPT_FILES
     testMayaComponentsPicking.py
     testFlowPluginsHierarchicalProperties.py
 	testCustomShadersNode.py
+	testMayaDefaultMaterial.py
     cpp/testColorPreferences.py
     cpp/testCppFramework.py
     cpp/testMayaSceneFlattening.py

test/lib/mayaUsd/render/mayaToHydra/testMayaDefaultMaterial.py

@@ -0,0 +1,45 @@
+#
+# Copyright 2024 Autodesk, Inc. All rights reserved.
+#
+# 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 maya.cmds as cmds
+import fixturesUtils
+import mtohUtils
+import mayaUtils
+
+class TestMayaDefaultMaterial(mtohUtils.MayaHydraBaseTestCase): #Subclassing mtohUtils.MayaHydraBaseTestCase to be able to call self.assertSnapshotClose
+    # MayaHydraBaseTestCase.setUpClass requirement.
+    _file = __file__
+
+    IMAGE_DIFF_FAIL_THRESHOLD = 0.05
+    IMAGE_DIFF_FAIL_PERCENT = 1.5
+
+    def test_MayaDefaultMaterial(self):
+
+        # open a Maya scene with maya mesh, usd prims and custom scene indices prims
+        testFile = mayaUtils.openTestScene(
+                "TestDefaultMaterial",
+                "testMayaDefaultMaterial_Native+Usd+dataProducer.ma", useTestSettings=False)
+        cmds.refresh()
+        panel = mayaUtils.activeModelPanel()
+        self.assertSnapshotClose("sceneLoaded" + ".png", self.IMAGE_DIFF_FAIL_THRESHOLD, self.IMAGE_DIFF_FAIL_PERCENT)        
+
+        #Use Default Material
+        cmds.modelEditor(panel, edit=True, useDefaultMaterial=True)
+        cmds.refresh()
+        self.assertSnapshotClose("defaultMaterial" + ".png", self.IMAGE_DIFF_FAIL_THRESHOLD, self.IMAGE_DIFF_FAIL_PERCENT)        
+
+if __name__ == '__main__':
+    fixturesUtils.runTests(globals())