使用URLRequestConvertible链接单元测试中的错误 [英] Linking error in unit test using URLRequestConvertible

问题描述

我有一个奇怪的问题，编写一个简单的单元测试（Xcode 7.2），这是一个非常简单的函数，它确保一个参数被添加到一个URL：

I have a weird problem writing a simple unit test (Xcode 7.2) for a very simple function which makes sure a parameter is added to a URL:

func appendToken(token: String, toRequest request: URLRequestConvertible) throws -> URLRequestConvertible {
    var error: NSError?
    let modifiedRequest: NSMutableURLRequest
    (modifiedRequest, error) = Alamofire.ParameterEncoding.URL.encode(request, parameters: ["token": self.token])

    guard error == nil else {
        // TODO: handle error
        throw error!
    }

    return modifiedRequest
}

单元测试是这样的：

func testTokenAddition() {
    let token = "ABCD12345"
    let client = MyClass(token: token)
    let originalRequest = NSURLRequest(URL: NSURL(string:"http://localhost")!)

    do {
        let modifiedRequest = try client.appendToken(token, toRequest: originalRequest).URLRequest
        XCTAssertTrue(modifiedRequest.URLRequest.URLString.hasSuffix("token=\(token)"))
    } catch {
        XCTFail()
        print(error)
    }
}

显然这是一个非常简单的测试，我想要构建它（所以请不要专注于实际的断言）。但是当我尝试运行测试时，我收到此链接错误：

Obviously this is a very simple test on which I want to build upon (so please don't focus on the actual assertion). But when I try to run the test, I get this linking error:

Undefined symbols for architecture x86_64:
  "protocol witness table for __ObjC.NSURLRequest : Alamofire.URLRequestConvertible in Alamofire", referenced from:
  SDKitTests.SDKitTests.testTokenAddition (SDKitTests.SDKitTests)() -> () in SDKitTests.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

当我从正常目标运行它时，该函数有效，所以问题在于测试函数，但我不清楚关于我应该如何调用它，我在非测试类中运行相同的代码并且没有问题，所以我对此有点困惑。此错误消息有点神秘，从我用Google搜索，见证表有点像协议的vtable。但我没有搞砸了， NSMutableURLRequest 的扩展是在Alamofire中实现的，而我只是在使用它。

The function works when I run it from a normal target, so the problem is in the test function, but I'm not clear on how I should be calling it, I run the same code in a non-test class and there was no problem, so I'm a bit puzzled by this. Also the error message is a bit cryptic, from what I've Googled, a witness table is kind of like a vtable for protocols. But I haven't messed with that, the extension to NSMutableURLRequest is implemented in Alamofire, and I'm just using it.

我做错了什么？我需要做些什么来解决它？

What am I doing wrong? What do I need to do to fix it?

推荐答案

确保Alamofire库与您的测试目标链接。

Ensure the Alamofire library is linked with your test target.

您可能还需要删除继承！ ：来自测试目标的search_paths 。

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