Revert "fix task teardown"

This reverts commit 5b49ba5.

Author: blink1073

tests/test_config.py

@@ -48,9 +48,8 @@ def test_config_with_uri_in_flask_conf_var(self):
         mongo = flask_pymongo.PyMongo(self.app, connect=True)
 
         _wait_until_connected(mongo)
-        assert mongo.cx is not None
-        self.addCleanup(mongo.cx.close)
         assert mongo.db is not None
+        assert mongo.cx is not None
         assert mongo.db.name == self.dbname
         assert ("localhost", self.port) == mongo.cx.address or (
             "127.0.0.1",
@@ -63,9 +62,8 @@ def test_config_with_uri_passed_directly(self):
         mongo = flask_pymongo.PyMongo(self.app, uri, connect=True)
 
         _wait_until_connected(mongo)
-        assert mongo.cx is not None
-        self.addCleanup(mongo.cx.close)
         assert mongo.db is not None
+        assert mongo.cx is not None
         assert mongo.db.name == self.dbname
         assert ("localhost", self.port) == mongo.cx.address or (
             "127.0.0.1",
@@ -93,8 +91,6 @@ class CustomDict(dict[str, Any]):
 
         uri = f"mongodb://localhost:{self.port}/{self.dbname}"
         mongo = flask_pymongo.PyMongo(self.app, uri, document_class=CustomDict)
-        assert mongo.cx is not None
-        self.addCleanup(mongo.cx.close)
         assert mongo.db is not None
         assert mongo.db.things.find_one() is None, "precondition failed"