Prefab/unit tests for deletion (#6034)

* Added tests for deleting entity under level and other prefabs

Signed-off-by: srikappa-amzn <82230713+srikappa-amzn@users.noreply.github.com>

* Added class comments and improved variable names

Signed-off-by: srikappa-amzn <82230713+srikappa-amzn@users.noreply.github.com>

* Called the reflect function of PrefabFocusHandler from PrefabSystemComponent

Signed-off-by: srikappa-amzn <82230713+srikappa-amzn@users.noreply.github.com>

* Added couple of unit tests around entity and prefab deletion

Signed-off-by: srikappa-amzn <82230713+srikappa-amzn@users.noreply.github.com>

* Used engine root path from settings registry as fake path for prefab creation

Signed-off-by: srikappa-amzn <82230713+srikappa-amzn@users.noreply.github.com>

* Added 2 unit tests around deleting prefabs

Signed-off-by: srikappa-amzn <82230713+srikappa-amzn@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabPublicHandler.cpp

@@ -521,21 +521,18 @@ namespace AzToolsFramework
                 nestedInstanceLink.has_value(),
                 "A valid link was not found for one of the instances provided as input for the CreatePrefab operation.");    
 
+            PrefabDom patchesCopyForUndoSupport;
             PrefabDomReference nestedInstanceLinkDom = nestedInstanceLink->get().GetLinkDom();
-            AZ_Assert(
-                nestedInstanceLinkDom.has_value(),
-                "A valid DOM was not found for the link corresponding to one of the instances provided as input for the "
-                "CreatePrefab operation.");
-
-            PrefabDomValueReference nestedInstanceLinkPatches =
-                PrefabDomUtils::FindPrefabDomValue(nestedInstanceLinkDom->get(), PrefabDomUtils::PatchesName);
-            AZ_Assert(
-                nestedInstanceLinkPatches.has_value(),
-                "A valid DOM for patches was not found for the link corresponding to one of the instances provided as input for the "
-                "CreatePrefab operation.");
+            if (nestedInstanceLinkDom.has_value())
+            {
+                PrefabDomValueReference nestedInstanceLinkPatches =
+                    PrefabDomUtils::FindPrefabDomValue(nestedInstanceLinkDom->get(), PrefabDomUtils::PatchesName);
+                if (nestedInstanceLinkPatches.has_value())
+                {
+                    patchesCopyForUndoSupport.CopyFrom(nestedInstanceLinkPatches->get(), patchesCopyForUndoSupport.GetAllocator());
+                }
+            }
 
-            PrefabDom patchesCopyForUndoSupport;
-            patchesCopyForUndoSupport.CopyFrom(nestedInstanceLinkPatches->get(), patchesCopyForUndoSupport.GetAllocator());
             PrefabUndoHelpers::RemoveLink(
                 sourceInstance->GetTemplateId(), targetTemplateId, sourceInstance->GetInstanceAlias(), sourceInstance->GetLinkId(),
                 AZStd::move(patchesCopyForUndoSupport), undoBatch);

Code/Framework/AzToolsFramework/Tests/Prefab/PrefabDeleteTests.cpp

@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project.
+ * For complete copyright and license terms please see the LICENSE at the root of this distribution.
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+
+#include <AzCore/Settings/SettingsRegistryMergeUtils.h>
+#include <AzToolsFramework/Entity/EditorEntityHelpers.h>
+#include <AzToolsFramework/ToolsComponents/TransformComponent.h>
+
+#include <Prefab/PrefabTestComponent.h>
+#include <Prefab/PrefabTestDomUtils.h>
+#include <Prefab/PrefabTestFixture.h>
+
+namespace UnitTest
+{
+    using PrefabDeleteTest = PrefabTestFixture;
+
+    TEST_F(PrefabDeleteTest, DeleteEntitiesInInstance_DeleteSingleEntitySucceeds)
+    {
+        PrefabEntityResult createEntityResult = m_prefabPublicInterface->CreateEntity(AZ::EntityId(), AZ::Vector3());
+
+        // Verify that a valid entity is created.
+        AZ::EntityId testEntityId = createEntityResult.GetValue();
+        ASSERT_TRUE(testEntityId.IsValid());
+        AZ::Entity* testEntity = AzToolsFramework::GetEntityById(testEntityId);
+        ASSERT_TRUE(testEntity != nullptr);
+
+        m_prefabPublicInterface->DeleteEntitiesInInstance(AzToolsFramework::EntityIdList{ testEntityId });
+
+        // Verify that entity can't be found after deletion.
+        testEntity = AzToolsFramework::GetEntityById(testEntityId);
+        EXPECT_TRUE(testEntity == nullptr);
+    }
+
+    TEST_F(PrefabDeleteTest, DeleteEntitiesInInstance_DeleteSinglePrefabSucceeds)
+    {
+        PrefabEntityResult createEntityResult = m_prefabPublicInterface->CreateEntity(AZ::EntityId(), AZ::Vector3());
+
+        // Verify that a valid entity is created.
+        AZ::EntityId createdEntityId = createEntityResult.GetValue();
+        ASSERT_TRUE(createdEntityId.IsValid());
+        AZ::Entity* createdEntity = AzToolsFramework::GetEntityById(createdEntityId);
+        ASSERT_TRUE(createdEntity != nullptr);
+
+        // Rather than hardcode a path, use a path from settings registry since that will work on all platforms.
+        AZ::SettingsRegistryInterface* registry = AZ::SettingsRegistry::Get();
+        AZ::IO::FixedMaxPath path;
+        registry->Get(path.Native(), AZ::SettingsRegistryMergeUtils::FilePathKey_EngineRootFolder);
+        CreatePrefabResult createPrefabResult =
+            m_prefabPublicInterface->CreatePrefabInMemory(AzToolsFramework::EntityIdList{ createdEntityId }, path);
+
+        AZ::EntityId createdPrefabContainerId = createPrefabResult.GetValue();
+        ASSERT_TRUE(createdPrefabContainerId.IsValid());
+        AZ::Entity* prefabContainerEntity = AzToolsFramework::GetEntityById(createdPrefabContainerId);
+        ASSERT_TRUE(prefabContainerEntity != nullptr);
+
+        // Verify that the prefab container entity and the entity within are deleted.
+        m_prefabPublicInterface->DeleteEntitiesInInstance(AzToolsFramework::EntityIdList{ createdPrefabContainerId });
+        prefabContainerEntity = AzToolsFramework::GetEntityById(createdPrefabContainerId);
+        EXPECT_TRUE(prefabContainerEntity == nullptr);
+        createdEntity = AzToolsFramework::GetEntityById(createdEntityId);
+        EXPECT_TRUE(createdEntity == nullptr);
+    }
+
+    TEST_F(PrefabDeleteTest, DeleteEntitiesAndAllDescendantsInInstance_DeletingEntityDeletesChildEntityToo)
+    {
+        PrefabEntityResult parentEntityCreationResult = m_prefabPublicInterface->CreateEntity(AZ::EntityId(), AZ::Vector3());
+
+        // Verify that valid parent entity is created.
+        AZ::EntityId parentEntityId = parentEntityCreationResult.GetValue();
+        ASSERT_TRUE(parentEntityId.IsValid());
+        AZ::Entity* parentEntity = AzToolsFramework::GetEntityById(parentEntityId);
+        ASSERT_TRUE(parentEntity != nullptr);
+
+        // Verify that valid child entity is created.
+        PrefabEntityResult childEntityCreationResult = m_prefabPublicInterface->CreateEntity(parentEntityId, AZ::Vector3());
+        AZ::EntityId childEntityId = childEntityCreationResult.GetValue();
+        ASSERT_TRUE(childEntityId.IsValid());
+        AZ::Entity* childEntity = AzToolsFramework::GetEntityById(childEntityId);
+        ASSERT_TRUE(childEntity != nullptr);
+
+        // PrefabTestFixture won't add required editor components by default. Hence we add them here.
+        AddRequiredEditorComponents(childEntity);
+        AddRequiredEditorComponents(parentEntity);
+
+        // Parent the child entity under the parent entity.
+        AZ::TransformBus::Event(childEntityId, &AZ::TransformBus::Events::SetParent, parentEntityId);
+
+        // Delete parent entity and its children.
+        m_prefabPublicInterface->DeleteEntitiesAndAllDescendantsInInstance(AzToolsFramework::EntityIdList{ parentEntityId });
+
+        // Verify that both the parent and child entities are deleted.
+        parentEntity = AzToolsFramework::GetEntityById(parentEntityId);
+        EXPECT_TRUE(parentEntity == nullptr);
+        childEntity = AzToolsFramework::GetEntityById(childEntityId);
+        EXPECT_TRUE(childEntity == nullptr);
+    }
+
+    TEST_F(PrefabDeleteTest, DeleteEntitiesAndAllDescendantsInInstance_DeletingEntityDeletesChildPrefabToo)
+    {
+        PrefabEntityResult entityToBePutUnderPrefabResult = m_prefabPublicInterface->CreateEntity(AZ::EntityId(), AZ::Vector3());
+
+        // Verify that a valid entity is created that will be put in a prefab later.
+        AZ::EntityId entityToBePutUnderPrefabId = entityToBePutUnderPrefabResult.GetValue();
+        ASSERT_TRUE(entityToBePutUnderPrefabId.IsValid());
+        AZ::Entity* entityToBePutUnderPrefab = AzToolsFramework::GetEntityById(entityToBePutUnderPrefabId);
+        ASSERT_TRUE(entityToBePutUnderPrefab != nullptr);
+
+        // Verify that a valid parent entity is created.
+        PrefabEntityResult parentEntityCreationResult = m_prefabPublicInterface->CreateEntity(AZ::EntityId(), AZ::Vector3());
+        AZ::EntityId parentEntityId = parentEntityCreationResult.GetValue();
+        ASSERT_TRUE(parentEntityId.IsValid());
+        AZ::Entity* parentEntity = AzToolsFramework::GetEntityById(parentEntityId);
+        ASSERT_TRUE(parentEntity != nullptr);
+
+        // Rather than hardcode a path, use a path from settings registry since that will work on all platforms.
+        AZ::SettingsRegistryInterface* registry = AZ::SettingsRegistry::Get();
+        AZ::IO::FixedMaxPath path;
+        registry->Get(path.Native(), AZ::SettingsRegistryMergeUtils::FilePathKey_EngineRootFolder);
+        CreatePrefabResult createPrefabResult =
+            m_prefabPublicInterface->CreatePrefabInMemory(AzToolsFramework::EntityIdList{ entityToBePutUnderPrefabId }, path);
+
+        // Verify that a valid prefab container entity is created.
+        AZ::EntityId createdPrefabContainerId = createPrefabResult.GetValue();
+        ASSERT_TRUE(createdPrefabContainerId.IsValid());
+        AZ::Entity* prefabContainerEntity = AzToolsFramework::GetEntityById(createdPrefabContainerId);
+        ASSERT_TRUE(prefabContainerEntity != nullptr);
+
+        // PrefabTestFixture won't add required editor components by default. Hence we add them here.
+        AddRequiredEditorComponents(parentEntity);
+        AddRequiredEditorComponents(prefabContainerEntity);
+
+        // Parent the prefab under the parent entity.
+        AZ::TransformBus::Event(createdPrefabContainerId, &AZ::TransformBus::Events::SetParent, parentEntityId);
+
+        // Delete the parent entity.
+        m_prefabPublicInterface->DeleteEntitiesAndAllDescendantsInInstance(AzToolsFramework::EntityIdList{ parentEntityId });
+
+        // Validate that the parent and the prefab under it and the entity inside the prefab are all deleted.
+        parentEntity = AzToolsFramework::GetEntityById(parentEntityId);
+        ASSERT_TRUE(parentEntity == nullptr);
+        entityToBePutUnderPrefab = AzToolsFramework::GetEntityById(entityToBePutUnderPrefabId);
+        ASSERT_TRUE(entityToBePutUnderPrefab == nullptr);
+        prefabContainerEntity = AzToolsFramework::GetEntityById(createdPrefabContainerId);
+        EXPECT_TRUE(prefabContainerEntity == nullptr);
+    }
+} // namespace UnitTest

Code/Framework/AzToolsFramework/Tests/Prefab/PrefabTestFixture.cpp

@@ -57,6 +57,11 @@ namespace UnitTest
         return AZStd::make_unique<PrefabTestToolsApplication>("PrefabTestApplication");
     }
 
+    void PrefabTestFixture::PropagateAllTemplateChanges()
+    {
+        m_prefabSystemComponent->OnSystemTick();
+    }
+
     AZ::Entity* PrefabTestFixture::CreateEntity(const char* entityName, const bool shouldActivate)
     {
         // Circumvent the EntityContext system and generate a new entity with a transformcomponent
@@ -125,4 +130,13 @@ namespace UnitTest
             EXPECT_EQ(entityInInstance->GetState(), AZ::Entity::State::Active);
         }
     }
+
+    void PrefabTestFixture::AddRequiredEditorComponents(AZ::Entity* entity)
+    {
+        ASSERT_TRUE(entity != nullptr);
+        entity->Deactivate();
+        AzToolsFramework::EditorEntityContextRequestBus::Broadcast(
+            &AzToolsFramework::EditorEntityContextRequests::AddRequiredComponents, *entity);
+        entity->Activate();
+    }
 }

Code/Framework/AzToolsFramework/Tests/Prefab/PrefabTestFixture.h

@@ -52,6 +52,8 @@ namespace UnitTest
 
         AZStd::unique_ptr<ToolsTestApplication> CreateTestApplication() override;
 
+        void PropagateAllTemplateChanges();
+
         AZ::Entity* CreateEntity(const char* entityName, const bool shouldActivate = true);
 
         void CompareInstances(const Instance& instanceA, const Instance& instanceB, bool shouldCompareLinkIds = true,
@@ -62,6 +64,8 @@ namespace UnitTest
         //! Validates that all entities within a prefab instance are in 'Active' state.
         void ValidateInstanceEntitiesActive(Instance& instance);
 
+        void AddRequiredEditorComponents(AZ::Entity* entity);
+
         PrefabSystemComponent* m_prefabSystemComponent = nullptr;
         PrefabLoaderInterface* m_prefabLoaderInterface = nullptr;
         PrefabPublicInterface* m_prefabPublicInterface = nullptr;

Code/Framework/AzToolsFramework/Tests/UI/EntityOutlinerTests.cpp

@@ -128,7 +128,7 @@ namespace UnitTest
         void ProcessDeferredUpdates()
         {
             // Force a prefab propagation for updates that are deferred to the next tick.
-            m_prefabSystemComponent->OnSystemTick();
+            PropagateAllTemplateChanges();
 
             // Ensure the model process its entity update queue
             m_model->ProcessEntityUpdates();

Code/Framework/AzToolsFramework/Tests/aztoolsframeworktests_files.cmake

@@ -69,6 +69,7 @@ set(FILES
     Prefab/PrefabFocus/PrefabFocusTests.cpp
     Prefab/MockPrefabFileIOActionValidator.cpp
     Prefab/MockPrefabFileIOActionValidator.h
+    Prefab/PrefabDeleteTests.cpp
     Prefab/PrefabDuplicateTests.cpp
     Prefab/PrefabEntityAliasTests.cpp
     Prefab/PrefabInstanceToTemplatePropagatorTests.cpp