[tests] add undo test

tests/test_inbox.py

@@ -40,13 +40,14 @@ def test_inbox_follow_request(
 
     # send follower request
     with mock.patch("app.boxes.MANUALLY_APPROVES_FOLLOWERS", False):
+        follow_id = ap_id + "/follow/" + (uuid4().hex)
         response = client.post(
             "/inbox",
             headers={"Content-Type": AP_CONTENT_TYPE},
             json={
                 "@context": ap.AS_CTX,
                 "type": "Follow",
-                "id": ap_id + "/follow/" + (uuid4().hex),
+                "id": follow_id,
                 "actor": ap_id,
                 "object": ap.ME["id"],
             },
@@ -65,6 +66,31 @@ def test_inbox_follow_request(
     follower_actor = db.execute(select(models.Follower)).scalar_one()
     assert follower_actor.ap_actor_id == ap_id
 
+    # send undo follower request
+    with mock.patch("app.boxes.MANUALLY_APPROVES_FOLLOWERS", False):
+        undo_id = ap_id + "/undo/" + (uuid4().hex)
+        response = client.post(
+            "/inbox",
+            headers={"Content-Type": AP_CONTENT_TYPE},
+            json={
+                "@context": ap.AS_CTX,
+                "type": "Undo",
+                "id": undo_id,
+                "actor": ap_id,
+                "object": {
+                    "type": "Follow",
+                    "id": follow_id,
+                    "actor": ap_id,
+                    "object": ap.ME["id"],
+                },
+            },
+        )
+    assert response.status_code == 202
+
+    # follower was not saved in follower table
+    follower_actor = db.execute(select(models.Follower)).scalar_one_or_none()
+    assert follower_actor == None
+
 
 def test_inbox_announce_request(
     db: Session,