diff --git a/src/app/+admin/admin-registries/bitstream-formats/bitstream-formats.component.spec.ts b/src/app/+admin/admin-registries/bitstream-formats/bitstream-formats.component.spec.ts
index 7ff15cad6d..95885a572c 100644
--- a/src/app/+admin/admin-registries/bitstream-formats/bitstream-formats.component.spec.ts
+++ b/src/app/+admin/admin-registries/bitstream-formats/bitstream-formats.component.spec.ts
@@ -209,7 +209,7 @@ describe('BitstreamFormatsComponent', () => {
           selectBitstreamFormat: {},
           deselectBitstreamFormat: {},
           deselectAllBitstreamFormats: {},
-          delete: observableOf(true),
+          delete: observableOf({ isSuccessful: true }),
           clearBitStreamFormatRequests: observableOf('cleared')
         });
 
diff --git a/src/app/+item-page/edit-item-page/item-bitstreams/item-bitstreams.component.spec.ts b/src/app/+item-page/edit-item-page/item-bitstreams/item-bitstreams.component.spec.ts
index 9184889257..58ace38adf 100644
--- a/src/app/+item-page/edit-item-page/item-bitstreams/item-bitstreams.component.spec.ts
+++ b/src/app/+item-page/edit-item-page/item-bitstreams/item-bitstreams.component.spec.ts
@@ -115,7 +115,7 @@ describe('ItemBitstreamsComponent', () => {
       }
     );
     bitstreamService = jasmine.createSpyObj('bitstreamService', {
-      deleteAndReturnResponse: jasmine.createSpy('deleteAndReturnResponse')
+      delete: jasmine.createSpy('delete')
     });
     objectCache = jasmine.createSpyObj('objectCache', {
       remove: jasmine.createSpy('remove')
@@ -183,12 +183,12 @@ describe('ItemBitstreamsComponent', () => {
       comp.submit();
     });
 
-    it('should call deleteAndReturnResponse on the bitstreamService for the marked field', () => {
-      expect(bitstreamService.deleteAndReturnResponse).toHaveBeenCalledWith(bitstream2.id);
+    it('should call delete on the bitstreamService for the marked field', () => {
+      expect(bitstreamService.delete).toHaveBeenCalledWith(bitstream2.id);
     });
 
-    it('should not call deleteAndReturnResponse on the bitstreamService for the unmarked field', () => {
-      expect(bitstreamService.deleteAndReturnResponse).not.toHaveBeenCalledWith(bitstream1.id);
+    it('should not call delete on the bitstreamService for the unmarked field', () => {
+      expect(bitstreamService.delete).not.toHaveBeenCalledWith(bitstream1.id);
     });
 
     it('should send out a patch for the move operations', () => {
diff --git a/src/app/core/data/bitstream-format-data.service.spec.ts b/src/app/core/data/bitstream-format-data.service.spec.ts
index 7954416010..99bf4eea18 100644
--- a/src/app/core/data/bitstream-format-data.service.spec.ts
+++ b/src/app/core/data/bitstream-format-data.service.spec.ts
@@ -281,7 +281,7 @@ describe('BitstreamFormatDataService', () => {
       format.uuid = 'format-uuid';
       format.id = 'format-id';
 
-      const expected = cold('(b|)', {b: true});
+      const expected = cold('(b|)', { b: responseCacheEntry.response });
       const result = service.delete(format.id);
 
       expect(result).toBeObservable(expected);
diff --git a/src/app/shared/comcol-forms/delete-comcol-page/delete-comcol-page.component.spec.ts b/src/app/shared/comcol-forms/delete-comcol-page/delete-comcol-page.component.spec.ts
index dbbeea5bc6..76653954d2 100644
--- a/src/app/shared/comcol-forms/delete-comcol-page/delete-comcol-page.component.spec.ts
+++ b/src/app/shared/comcol-forms/delete-comcol-page/delete-comcol-page.component.spec.ts
@@ -48,7 +48,7 @@ describe('DeleteComColPageComponent', () => {
     dsoDataService = jasmine.createSpyObj(
       'dsoDataService',
       {
-        delete: observableOf(true)
+        delete: observableOf({ isSuccessful: true })
       });
 
     routerStub = {
@@ -106,7 +106,7 @@ describe('DeleteComColPageComponent', () => {
     });
 
     it('should show an error notification on failure', () => {
-      (dsoDataService.delete as any).and.returnValue(observableOf(false));
+      (dsoDataService.delete as any).and.returnValue(observableOf({ isSuccessful: false }));
       spyOn(router, 'navigate');
       comp.onConfirm(data2);
       fixture.detectChanges();
diff --git a/src/app/shared/mydspace-actions/workspaceitem/workspaceitem-actions.component.spec.ts b/src/app/shared/mydspace-actions/workspaceitem/workspaceitem-actions.component.spec.ts
index 00f5422b27..6f9efca7d3 100644
--- a/src/app/shared/mydspace-actions/workspaceitem/workspaceitem-actions.component.spec.ts
+++ b/src/app/shared/mydspace-actions/workspaceitem/workspaceitem-actions.component.spec.ts
@@ -148,7 +148,7 @@ describe('WorkspaceitemActionsComponent', () => {
 
   it('should display a success notification on delete success', async(() => {
     spyOn((component as any).modalService, 'open').and.returnValue({result: Promise.resolve('ok')});
-    mockDataService.delete.and.returnValue(observableOf(true));
+    mockDataService.delete.and.returnValue(observableOf({ isSuccessful: true }));
     spyOn(component, 'reload');
 
     component.confirmDiscard('ok');