tests/test_app_factory.py

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from app import __version__
from app.main import create_app


def test_create_app_returns_fastapi_instance():
    app = create_app()

    assert isinstance(app, FastAPI)
    assert app.title == "Multimodal AI Intelligence Platform"
    assert app.version == __version__


def test_create_app_mounts_v1_router():
    # Use the OpenAPI spec (public, stable surface) instead of walking
    # `app.routes` — newer FastAPI hides included routes behind a wrapper
    # that exposes neither `.path` nor a recursible `.routes`.
    app = create_app()
    spec = app.openapi()

    assert "/api/v1/health" in spec.get("paths", {})


def test_create_app_registers_cors_middleware():
    app = create_app()

    cors_middlewares = [m for m in app.user_middleware if m.cls is CORSMiddleware]
    assert len(cors_middlewares) == 1


def test_cors_preflight_allows_configured_origin(client):
    response = client.options(
        "/api/v1/health",
        headers={
            "Origin": "http://localhost:3000",
            "Access-Control-Request-Method": "GET",
        },
    )

    assert response.status_code == 200
    assert response.headers["access-control-allow-origin"] == "http://localhost:3000"


def test_cors_get_includes_allow_origin_header(client):
    response = client.get(
        "/api/v1/health",
        headers={"Origin": "http://localhost:3000"},
    )

    assert response.status_code == 200
    assert response.headers["access-control-allow-origin"] == "http://localhost:3000"