pythonasyncioapiasyncfastapiframeworkjsonjson-schemaopenapiopenapi3pydanticpython-typespython3redocreststarletteswaggerswagger-uiuvicornweb
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51 lines
1.4 KiB
51 lines
1.4 KiB
from unittest.mock import patch
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from fastapi import FastAPI
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from fastapi.responses import JSONResponse
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from fastapi.testclient import TestClient
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from pydantic import BaseModel
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class Item(BaseModel):
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name: str
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price: float
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app = FastAPI()
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@app.get("/default")
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def get_default() -> Item:
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return Item(name="widget", price=9.99)
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@app.get("/explicit", response_class=JSONResponse)
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def get_explicit() -> Item:
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return Item(name="widget", price=9.99)
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client = TestClient(app)
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def test_default_response_class_skips_json_dumps():
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"""When no response_class is set, the fast path serializes directly to
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JSON bytes via Pydantic's dump_json and never calls json.dumps."""
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with patch(
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"starlette.responses.json.dumps", wraps=__import__("json").dumps
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) as mock_dumps:
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response = client.get("/default")
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assert response.status_code == 200
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assert response.json() == {"name": "widget", "price": 9.99}
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mock_dumps.assert_not_called()
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def test_explicit_response_class_uses_json_dumps():
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"""When response_class is explicitly set to JSONResponse, the normal path
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is used and json.dumps is called via JSONResponse.render()."""
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with patch(
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"starlette.responses.json.dumps", wraps=__import__("json").dumps
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) as mock_dumps:
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response = client.get("/explicit")
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assert response.status_code == 200
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assert response.json() == {"name": "widget", "price": 9.99}
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mock_dumps.assert_called_once()
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