使用每个测试的不同依赖项覆盖测试的FastAPI依赖项的最佳方法

import pytest
from fastapi.testclient import TestClient
from app import app, SomeDependency

@pytest.fixture
def mock_dependency():
    # 模拟依赖项的返回值或行为
    mock_dep = SomeDependency()
    mock_dep.some_method = pytest.Mock(return_value="mocked value")
    return mock_dep

def test_endpoint_with_mocked_dependency(mock_dependency):
    # 使用模拟的依赖项来覆盖FastAPI的实际依赖项
    app.dependency_overrides[SomeDependency] = lambda: mock_dependency

    # 发起测试请求
    client = TestClient(app)
    response = client.get("/endpoint")

    # 验证响应
    assert response.status_code == 200
    assert response.json() == {"message": "mocked value"}

    # 清除依赖项覆盖
    app.dependency_overrides.clear()