diff --git a/spec/integration/assign_spec.rb b/spec/integration/assign_spec.rb
index 8da9319..028ffed 100644
--- a/spec/integration/assign_spec.rb
+++ b/spec/integration/assign_spec.rb
@@ -110,14 +110,17 @@ describe "integration tests" do
     end
 
     it "assigns topic" do
-      DiscourseEvent.trigger(:assign_topic, topic, user1, admin)
-      expect(topic.assignment.assigned_to_id).to eq(user1.id)
+      expect do DiscourseEvent.trigger(:assign_topic, topic, user1, admin) end.to change {
+        Assignment.where(topic: topic).pluck_first(:assigned_to_id)
+      }.from(nil).to(user1.id)
 
-      DiscourseEvent.trigger(:assign_topic, topic, user2, admin)
-      expect(topic.assignment.assigned_to_id).to eq(user1.id)
+      expect do DiscourseEvent.trigger(:assign_topic, topic, user2, admin) end.to_not change {
+        Assignment.where(topic: topic).pluck_first(:assigned_to_id)
+      }.from(user1.id)
 
-      DiscourseEvent.trigger(:assign_topic, topic, user2, admin, true)
-      expect(topic.assignment.assigned_to_id).to eq(user2.id)
+      expect do DiscourseEvent.trigger(:assign_topic, topic, user2, admin, true) end.to change {
+        Assignment.where(topic: topic).pluck_first(:assigned_to_id)
+      }.from(user1.id).to(user2.id)
     end
 
     it "triggers a webhook for assigned and unassigned" do