PYTHON-3316 Add Type Check Test for Transactions (#995)

Author: blink1073

test/test_mypy.py

@@ -47,6 +47,7 @@ class Movie(TypedDict):  # type: ignore[misc]
 from pymongo.collection import Collection
 from pymongo.mongo_client import MongoClient
 from pymongo.operations import InsertOne
+from pymongo.read_preferences import ReadPreference
 
 TEST_PATH = os.path.join(os.path.dirname(os.path.realpath(__file__)), "mypy_fails")
 
@@ -163,6 +164,15 @@ class mydict(Dict[str, Any]):
         )
         self.assertTrue(len(list(result)))
 
+    def test_with_transaction(self) -> None:
+        def execute_transaction(session):
+            pass
+
+        with self.client.start_session() as session:
+            return session.with_transaction(
+                execute_transaction, read_preference=ReadPreference.PRIMARY
+            )
+
 
 class TestDecode(unittest.TestCase):
     def test_bson_decode(self) -> None: