GREEN fix donations controller spec to expect redirect

Error message changes if using events or not, add cases for both

spec/controllers/donations_controller_spec.rb

@@ -119,7 +119,7 @@
           }
           donation_params = { source: donation.source, storage_location: new_storage_location, line_items_attributes: line_item_params }
           put :update, params: { id: donation.id, donation: donation_params }
-          expect(response).not_to redirect_to(anything)
+          expect(response).to redirect_to(edit_donation_path(donation))
           expect(original_storage_location.size).to eq 5
           expect(new_storage_location.size).to eq 0
           expect(donation.reload.line_items.first.quantity).to eq 10

spec/requests/donations_requests_spec.rb

@@ -204,7 +204,12 @@
 
         get response.headers['Location']
 
-        expect(flash[:alert]).to include("Error updating donation: Requested items exceed the available inventory")
+        if Event.read_events?(organization)
+          expect(flash[:alert]).to include("Error updating donation: Could not reduce quantity by 99 - current quantity is 10 for Brightbloom Seed")
+        else # TODO remove this branch when switching to events
+          expect(flash[:alert]).to include("Error updating donation: Requested items exceed the available inventory")
+        end
+
         expect(response.body).to include(item.name)
         expect(response.body).to include(original_quantity.to_s)
       end