make tests compatible with Python 3.8 and 3.9

Signed-off-by: merlinz01 <158784988+merlinz01@users.noreply.github.com>

tests/test_none_passed_when_null_received.py

@@ -1,4 +1,5 @@
-from typing import Annotated, Optional, Union
+import sys
+from typing import Optional, Union
 
 import pytest
 from fastapi import Body, FastAPI
@@ -7,33 +8,52 @@ from fastapi.testclient import TestClient
 app = FastAPI()
 DEFAULT = 1234567890
 
+endpoints = []
 
-@app.post("/api1")
-def api1(integer_or_null: Annotated[int | None, Body(embed=True)] = DEFAULT) -> dict:
+if sys.hexversion >= 0x31000000:
+    from typing import Annotated
+
+    @app.post("/api1")
+    def api1(
+        integer_or_null: Annotated[int | None, Body(embed=True)] = DEFAULT,
+    ) -> dict:
         return {"received": integer_or_null}
 
+    endpoints.append("/api1")
 
-@app.post("/api2")
-def api2(integer_or_null: Annotated[Optional[int], Body(embed=True)] = DEFAULT) -> dict:
+
+if sys.hexversion >= 0x30900000:
+    from typing import Annotated
+
+    @app.post("/api2")
+    def api2(
+        integer_or_null: Annotated[Optional[int], Body(embed=True)] = DEFAULT,
+    ) -> dict:
         return {"received": integer_or_null}
 
+    endpoints.append("/api2")
 
-@app.post("/api3")
-def api3(
+    @app.post("/api3")
+    def api3(
         integer_or_null: Annotated[Union[int, None], Body(embed=True)] = DEFAULT,
-) -> dict:
+    ) -> dict:
         return {"received": integer_or_null}
 
+    endpoints.append("/api3")
+
 
 @app.post("/api4")
 def api4(integer_or_null: Optional[int] = Body(embed=True, default=DEFAULT)) -> dict:
     return {"received": integer_or_null}
 
 
+endpoints.append("/api4")
+
+
 client = TestClient(app)
 
 
-@pytest.mark.parametrize("api", ["/api1", "/api2", "/api3", "/api4"])
+@pytest.mark.parametrize("api", endpoints)
 def test_api1_integer(api):
     response = client.post(api, json={"integer_or_null": 100})
     assert response.status_code == 200, response.text