[USDU-276] Adds testcase for Force Refreshing USDZ Imported prefab with Import Preview Surface option

Author: lee-aandrew

package/com.unity.formats.usd/Tests/Editor/UsdAssetReloadTests.cs

@@ -14,19 +14,19 @@ public class UsdAssetReloadTests : BaseFixtureEditor
         const string k_USDGUID = "68d552f46d3740c47b17d0ac1c531e76";  // reloadTest.usda
         const string k_USDModifiedGUID = "4eccf405e5254fd4089cef2f9bcbd882"; // reloadTest_modified.usda
         const string k_USDOriginGUID = "069ae5d2d8a36fd4b8a0395de731eda0"; // reloadTest_origin.usda
+        const string k_USDZGUID = "a90ff3ebef4a2aa42b559da07e4151f5"; // test-roughness.usdz
 
         string testFilePath;
         string testFileModifiedPath;
+        string prefabUsdPath;
 
         GameObject m_usdRoot;
         UsdAsset m_usdAsset;
 
         [SetUp]
         public void Setup()
         {
-            testFilePath = Path.GetFullPath(AssetDatabase.GUIDToAssetPath(k_USDGUID));
-            var stage = pxr.UsdStage.Open(testFilePath, pxr.UsdStage.InitialLoadSet.LoadNone);
-            var scene = Scene.Open(stage);
+            var scene = OpenUSDGUIDAssetScene(k_USDGUID, out testFilePath);
             m_usdRoot = ImportHelpers.ImportSceneAsGameObject(scene);
             scene.Close();
 
@@ -35,12 +35,24 @@ public void Setup()
             Assume.That(m_usdAsset, Is.Not.Null, "Could not find USDAsset component on root gameobject.");
         }
 
+        private Scene OpenUSDGUIDAssetScene(string guid, out string filePath)
+        {
+            filePath = Path.GetFullPath(AssetDatabase.GUIDToAssetPath(guid));
+            var stage = pxr.UsdStage.Open(filePath, pxr.UsdStage.InitialLoadSet.LoadNone);
+            return Scene.Open(stage);
+        }
+
         [TearDown]
         public void TearDown()
         {
             m_usdAsset.DestroyAllImportedObjects();
             GameObject.DestroyImmediate(m_usdRoot);
 
+            if (!string.IsNullOrEmpty(prefabUsdPath))
+            {
+                AssetDatabase.DeleteAsset(prefabUsdPath);
+            }
+
             // Restore test files.
             ResetTestFile();
         }
@@ -109,6 +121,26 @@ public void UsdAsset_Reload_FileDidNotChange_ValuesDoNotChange()
             Assert.AreEqual(new Vector4(1, 1, 1, 1), translate);
         }
 
+        [Test]
+        [Ignore("USDU-276")]
+        public void UsdAsset_Force_Reload_Prefab_ImportPreviewSurface()
+        {
+            var initialRootGameObjects = UnityEngine.SceneManagement.SceneManager.GetActiveScene().GetRootGameObjects();
+            var scene = OpenUSDGUIDAssetScene(k_USDZGUID, out _);
+            prefabUsdPath = ImportHelpers.ImportAsPrefab(scene);
+            scene.Close();
+
+            var prefabAsset = AssetDatabase.LoadAssetAtPath<UsdAsset>(prefabUsdPath);
+            prefabAsset.m_materialImportMode = MaterialImportMode.ImportPreviewSurface;
+
+            LogAssert.Expect(LogType.Error, "Destroying assets is not permitted to avoid data loss.\nIf you really want to remove an asset use DestroyImmediate (theObject, true);");
+            prefabAsset.Reload(true);
+
+            var newRootGameObjects = UnityEngine.SceneManagement.SceneManager.GetActiveScene().GetRootGameObjects();
+
+            Assert.AreEqual(initialRootGameObjects, newRootGameObjects, "Error during Prefab Reload does not clean up the scene");
+        }
+
         void UpdateTestFile()
         {
             testFileModifiedPath = Path.GetFullPath(AssetDatabase.GUIDToAssetPath(k_USDModifiedGUID));