Add test to make sure the join is correct

test/pleroma/web/activity_pub/activity_pub_test.exs

@@ -723,17 +723,20 @@ test "retrieve the activities for certain recipients" do
     test "it should return public activities that reference a given hashtag" do
       hashtag = insert(:hashtag, name: "tenshi")
       user = insert(:user)
+      other_user = insert(:user)
 
+      {:ok, normally_visible} = CommonAPI.post(other_user, %{status: "hello :)", visibility: "public"})
       {:ok, public} = CommonAPI.post(user, %{status: "maji #tenshi", visibility: "public"})
       {:ok, _unrelated} = CommonAPI.post(user, %{status: "dai #tensh", visibility: "public"})
       {:ok, unlisted} = CommonAPI.post(user, %{status: "maji #tenshi", visibility: "unlisted"})
       {:ok, _private} = CommonAPI.post(user, %{status: "maji #tenshi", visibility: "private"})
 
-      activities = ActivityPub.fetch_activities([], %{followed_hashtags: [hashtag.id]})
-      assert length(activities) == 2
+      activities = ActivityPub.fetch_activities([other_user.follower_address], %{followed_hashtags: [hashtag.id]})
+      assert length(activities) == 3
+      normal_id = normally_visible.id
       public_id = public.id
       unlisted_id = unlisted.id
-      assert [%{id: ^public_id}, %{id: ^unlisted_id}] = activities
+      assert [%{id: ^normal_id}, %{id: ^public_id}, %{id: ^unlisted_id}] = activities
     end
   end