import Foundation enum GeminiAPITestHelpers {    static func dataLoader(        handler: @escaping @Sendable (URLRequest) throws -> (HTTPURLResponse, Data))        -> @Sendable (URLRequest) async throws -> (Data, URLResponse)    {        { request in            let (response, data) = try handler(request)            return (data, response)        }    }     static func response(url: String, status: Int, body: Data) -> (HTTPURLResponse, Data) {        let response = HTTPURLResponse(            url: URL(string: url)!,            statusCode: status,            httpVersion: nil,            headerFields: ["Content-Type": "application/json"])!        return (response, body)    }     static func jsonData(_ payload: [String: Any]) -> Data {        (try? JSONSerialization.data(withJSONObject: payload)) ?? Data()    }     static func sampleQuotaResponse() -> Data {        self.jsonData([            "buckets": [                [                    "modelId": "gemini-2.5-pro",                    "remainingFraction": 0.6,                    "resetTime": "2025-01-01T00:00:00Z",                ],                [                    "modelId": "gemini-2.5-flash",                    "remainingFraction": 0.9,                    "resetTime": "2025-01-01T00:00:00Z",                ],                [                    "modelId": "gemini-2.5-flash-lite",                    "remainingFraction": 0.8,                    "resetTime": "2025-01-01T00:00:00Z",                ],            ],        ])    }     static func sampleFlashQuotaResponse() -> Data {        self.jsonData([            "buckets": [                [                    "modelId": "gemini-2.5-flash",                    "remainingFraction": 0.9,                    "resetTime": "2025-01-01T00:00:00Z",                ],                [                    "modelId": "gemini-2.5-flash",                    "remainingFraction": 0.4,                    "resetTime": "2025-01-01T00:00:00Z",                ],            ],        ])    }     static func makeIDToken(email: String, hostedDomain: String? = nil) -> String {        var payload: [String: Any] = ["email": email]        if let hd = hostedDomain {            payload["hd"] = hd        }        let data = (try? JSONSerialization.data(withJSONObject: payload)) ?? Data()        var encoded = data.base64EncodedString()        encoded = encoded.replacingOccurrences(of: "+", with: "-")        encoded = encoded.replacingOccurrences(of: "/", with: "_")        encoded = encoded.replacingOccurrences(of: "=", with: "")        return "header.\(encoded).sig"    }     static func loadCodeAssistResponse(tierId: String, projectId: String? = nil) -> Data {        var payload: [String: Any] = [            "currentTier": [                "id": tierId,                "name": tierId.replacingOccurrences(of: "-tier", with: ""),            ],        ]        if let projectId {            payload["cloudaicompanionProject"] = projectId        }        return self.jsonData(payload)    }     static func loadCodeAssistFreeTierResponse() -> Data {        self.loadCodeAssistResponse(tierId: "free-tier")    }     static func loadCodeAssistStandardTierResponse() -> Data {        self.loadCodeAssistResponse(tierId: "standard-tier")    }     static func loadCodeAssistLegacyTierResponse() -> Data {        self.loadCodeAssistResponse(tierId: "legacy-tier")    }}