swift - 使用备用数据创建 Swift HTTP 模拟

Question

我有一个模拟的 HTTPManager，我希望它返回 userIDResonse 或 tokenResponse。

为了能够做到这一点，我使模拟符合协议(protocol)，以允许在测试中进行设置。

let userIDResponse = """
{\"user_id\":\"5a7ab957a225856b38f49bb4\"}
"""

let tokenResponse = """
{\"access_token\":\"eyJhbGciOiJSUzI1NiIsImtpZCI6IjczMUE3OUEyMjY3QjY4Q0EwNTc5QjYzRjdFMkY0QjlBQkZFMENEMTUiLCJ0eXAiOiJKV1QiLCJ4NXQiOiJjeHA1b2laN2FNb0ZlYllfZmk5TG1yX2d6UlUifQ.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.q4-SF5KBVSwN4bFhcQ88icR9X2jzz_JH2K4EpDgS-oZjjppNruckxfTjauVqcwG8zPR0eGzx5CBXiAfMeg9akShWajqBZ9rkCsqjXw6Ef74J9cTBDhxTEUL0v7P0zm_fVNOutM_UJQ-DiQr2gAO0mfAxMhOiQ_uXlKoM2RYGKjfMkH6Ym7kBjtRAhho8pPVmtQiBmVFI5OUVXNU3rPVgB7sx-I1LZmUZBZoy7T4s14TAuE4yiUyTBgO5joyRsZtMdFybna8CRK_ylS3WC6wOBNm74O9IrZlbsiradtLzMG-9E8AnjbvH4RYR68H2xpt562PfnGD_VC9NXFQ7iRrRMw\"}
"""

由模拟使用

protocol HTTPManagerMockProtocol {
    func setResponse(response: String.UTF8View)
}

typealias HTTPMock = HTTPManagerProtocol & HTTPManagerMockProtocol

class HTTPManagerMock: HTTPMock {

    var data = Data(userIDResponse.utf8)

    func setResponse(response: String.UTF8View) {
        data = Data(response)
    }

    func get(urlString: String, parameters: [String : String], completionBlock: @escaping (Result<Data, Error>) -> Void) {
        completionBlock(.success(data))
    }

}

所以在我的测试中我必须设置响应:

let httpMock = HTTPManagerMock()
httpMock.setResponse(response: tokenResponse.utf8)
sut = Login(serverString: "serverURL", headers: [:], httpManager: httpMock )

在某些方面，这似乎没问题，但这意味着我无法在测试中使用设置函数，这会导致我的测试类中出现重复的代码。

哪种方法意味着我可以拥有具有不同输出的模拟，而无需生成额外的测试代码？

Answer 1

创建参数化辅助方法来创建您的被测系统。

private func makeLogin(response: String) -> Login {
    let httpMock = HTTPManagerMock()
    httpMock.setResponse(response: response.utf8)
    return Login(serverString: "serverURL", headers: [:], httpManager: httpMock)
}

这样，您就可以改变不同测试的响应。如果您进行的测试并不真正关心响应并希望提供虚拟数据，那么这可以是帮助程序中的默认值。