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import pytest
from flask import Flask
from flask import jsonify
from flask import url_for
class TestResponseOverwriting:
"""
we overwrite the app fixture here so we can test
_monkeypatch_response_class (an autouse fixture)
will return the original response_class since a
json @property is already present in response_class
"""
@pytest.fixture
def app(self):
app = Flask(__name__)
app.config["SECRET_KEY"] = "42"
class MyResponse(app.response_class):
@property
def json(self):
return 49
@app.route("/ping")
def ping():
return jsonify(ping="pong")
app.response_class = MyResponse
return app
def test_dont_rewrite_existing_implementation(self, accept_json, client):
res = client.get(url_for("ping"), headers=accept_json)
assert res.json == 49
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