"operationId": "read_current_user_users_me_get",
                        "security": [{"APIKeyQuery": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {
                    "APIKeyQuery": {"type": "apiKey", "name": "key", "in": "query"}
                }
            },
        }

                        "operationId": "read_current_user_users_me_get",
                        "security": [{"HTTPBase": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {
                    "HTTPBase": {
                        "type": "http",
                        "scheme": "Other",
                        "description": "Other Security Scheme",

                        "operationId": "read_current_user_users_me_get",
                        "security": [{"APIKeyQuery": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {
                    "APIKeyQuery": {
                        "type": "apiKey",
                        "name": "key",
                        "in": "query",

                        "operationId": "read_current_user_users_me_get",
                        "security": [{"APIKeyQuery": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {
                    "APIKeyQuery": {"type": "apiKey", "name": "key", "in": "query"}
                }
            },
        }

                        "operationId": "read_current_user_users_me_get",
                        "security": [{"HTTPDigest": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {"HTTPDigest": {"type": "http", "scheme": "digest"}}
            },
        }

                        "operationId": "read_current_user_users_me_get",
                        "security": [{"APIKeyHeader": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {
                    "APIKeyHeader": {"type": "apiKey", "name": "key", "in": "header"}
                }
            },
        }

                        "operationId": "read_current_user_users_me_get",
                        "security": [{"HTTPDigest": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {"HTTPDigest": {"type": "http", "scheme": "digest"}}
            },
        }

        },
    },
}


def test_custom_response_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json()["components"]["schemas"]["Item"] == item_schema


def test_response():
    # For coverage
    response = client.get("/foo")
    assert response.status_code == 200, response.text

# Dependencies { #dependencies }

**FastAPI** has a very powerful but intuitive **<dfn title="also known as components, resources, providers, services, injectables">Dependency Injection</dfn>** system.

It is designed to be very simple to use, and to make it very easy for any developer to integrate other components with **FastAPI**.

## What is "Dependency Injection" { #what-is-dependency-injection }

                        "operationId": "read_current_user_users_me_get",
                        "security": [{"APIKeyCookie": []}],
                    }
                }
            },
            "components": {
                "securitySchemes": {
                    "APIKeyCookie": {"type": "apiKey", "name": "key", "in": "cookie"}
                }
            },
        }