FastAPI Dependency overrides made easy.
Project description
fastapi-overrider
Easy and safe dependency overrides for your FastAPI tests.
Installation
pip install fastapi-overrider
Usage
Use it as pytest fixture to ensure every test is run with a clean set of overrides:
@pytest.fixture(scope="function")
def override(app: FastAPI):
with Overrider(app) as override:
yield override
def test_get_item(client: TestClient, override: Overrider):
override.value(dependencies.retrieve_items, ["Foo"])
response = client.get("/item/0")
assert response.text == "Foo"
Alternatively use it as a context manager:
def test_get_item(client: TestClient, app: FastAPI):
with Overrider(app) as override:
override.value(dependencies.retrieve_items, ["Foo"])
response = client.get("/item/0")
assert response.text == "Foo"
In both cases the overrides will be cleaned up after the test.
The above examples also show how to override a dependency with just the desired return value. Overrider will take care of creating a matching wrapper function and setting it as an override.
override.value()
returns the override value:
def test_get_content(client: TestClient, override: Overrider):
override.value(dependencies.retrieve_items, SomeModel()).content = "Foo"
response = client.get("/content/")
assert response.text == "Foo"
def test_get_content(client: TestClient, override: Overrider):
model = override.value(dependencies.retrieve_items, SomeModel())
model.id = 0
model.text = "Foo"
response = client.get("/content/")
assert response.text == "0: Foo"
override.function()
accepts a callable`:
def test_get_item(client: TestClient, override: Overrider):
def override_retrieve_item(id: int):
return f"{id}: Foo"
override.function(dependencies.retrieve_items, override_retrieve_item)
response = client.get("/item/0")
assert response.text == "0: Foo"
Use it as a drop-in replacement for app.dependency_overrides
:
def test_get_item(client: TestClient, override: Overrider):
def override_retrieve_item(id: int):
return f"{id}: Foo"
override[dependencies.retrieve_items] = override_retrieve_item
response = client.get("/item/0")
assert response.text == "0: Foo"
Overrider can create mocks for you:
def test_get_item(client: TestClient, override: Overrider):
mock_retriever = override.mock(dependencies.retrieve_items)
mock_retriever.return_value = "Foo"
response = client.get("/item/0")
mock_retriever.assert_called_with(0)
assert response.text == "Foo"
Reuse common overrides:
@pytest.fixture(scope="function")
def as_dave(app: FastAPI):
with Overrider(app) as override:
mock_user = override,mock(dependencies.get_user)
mock_user.name = "Dave"
yield override
def test_get_greeting(client: TestClient, as_dave: Overrider):
response = client.get("/")
assert response.text == "Good morning, Dave"
Extend it with your own convenience methods:
class MyOverrider(Overrider):
def user(self, username: str, uid: str, authenticated: bool = False):
mock_user = self.mock(dependencies.get_user)
mock_user.username = username
mock_user.uid = uid
mock_user.authenticate.return_value = authenticated
@pytest.fixture(scope="function")
def override(app: FastAPI):
with MyOverrider(app) as override:
yield override
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