client_fixture() — fastapi Function Reference

Architecture documentation for the client_fixture() function in test_union_body_discriminator_annotated.py from the fastapi codebase.

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FastAPI→ Applications→ client_fixture() — fastapi Function Reference

Dependency Diagram

graph TD
  9d6526c8_0d0c_a21d_d732_884e55210d8e["client_fixture()"]
  2085b234_c53e_638c_3dcf_8d81fbaa1f3d["test_union_body_discriminator_annotated.py"]
  9d6526c8_0d0c_a21d_d732_884e55210d8e -->|defined in| 2085b234_c53e_638c_3dcf_8d81fbaa1f3d
  style 9d6526c8_0d0c_a21d_d732_884e55210d8e fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

tests/test_union_body_discriminator_annotated.py lines 13–45

def client_fixture() -> TestClient:
    from fastapi import Body
    from pydantic import Discriminator, Tag

    class Cat(BaseModel):
        pet_type: str = "cat"
        meows: int

    class Dog(BaseModel):
        pet_type: str = "dog"
        barks: float

    def get_pet_type(v):
        assert isinstance(v, dict)
        return v.get("pet_type", "")

    Pet = Annotated[
        Union[Annotated[Cat, Tag("cat")], Annotated[Dog, Tag("dog")]],
        Discriminator(get_pet_type),
    ]

    app = FastAPI()

    @app.post("/pet/assignment")
    async def create_pet_assignment(pet: Pet = Body()):
        return pet

    @app.post("/pet/annotated")
    async def create_pet_annotated(pet: Annotated[Pet, Body()]):
        return pet

    client = TestClient(app)
    return client