XCode UI测试swizzle API类方法

时间:2015-11-10 12:21:35

标签: ios cocoa-touch xcode7 xcode-ui-testing

我有一个带有两个按钮的简单应用程序,它们调用JSON Web服务并打印出结果消息。

我想尝试新的XCode 7 UI测试,但我无法理解如何模拟API请求。

为简单起见,我构建了一个没有实际请求或任何异步操作的示例。

我在主目标中有ZZSomeAPI.swift个文件:

import Foundation
public class ZZSomeAPI: NSObject {
  public class func call(parameter:String) -> Bool {
      return true
  }
}

然后是我的ZZSomeClientViewController.swift

import UIKit
class ZZSomeClientViewController: UIViewController {
    @IBAction func buttonClick(sender: AnyObject) {
        print(ZZSomeAPI.call("A"))
    }
}

现在我添加了一个UITest目标,记录了点击按钮,我有类似的东西:

import XCTest
class ZZSomeClientUITests: XCTestCase {
    override func setUp() {
        super.setUp()
        continueAfterFailure = false
        XCUIApplication().launch()
    }

    func testCall() {
        let app = XCUIApplication()
        app.childrenMatchingType(.Window).elementBoundByIndex(0).childrenMatchingType(.Other).element.childrenMatchingType(.Other).elementBoundByIndex(1).childrenMatchingType(.Button).elementBoundByIndex(0).tap()
    }        
}

这样可行并运行测试将打印出true。但是我希望在API返回false时包含测试,而不会弄乱API。所以,我将ZZSomeAPI.swift添加到UI测试目标并尝试了方法调配(更新了UITest代码):

import XCTest

class ZZSomeClientUITests: XCTestCase {

    override func setUp() {
        super.setUp()
        continueAfterFailure = false
        XCUIApplication().launch()
    }

    func testSwizzle() {
        XCTAssert(ZZSomeAPI.call("a"))
        XCTAssertFalse(ZZSomeAPI.callMock("a"))
        XCTAssert(ZZSomeAPI.swizzleClass("call", withSelector: "callMock", forClass: ZZSomeAPI.self))
        XCTAssertFalse(ZZSomeAPI.call("a"), "failed swizzle")
    }

    func testCall() {
        XCTAssert(ZZSomeAPI.swizzleClass("call", withSelector: "callMock", forClass: ZZSomeAPI.self))
        let app = XCUIApplication()
        app.childrenMatchingType(.Window).elementBoundByIndex(0).childrenMatchingType(.Other).element.childrenMatchingType(.Other).elementBoundByIndex(1).childrenMatchingType(.Button).elementBoundByIndex(0).tap()
    }

}

extension NSObject {
    public class func swizzleClass(origSelector: String!, withSelector: String!, forClass:AnyClass!) -> Bool {
        var originalMethod: Method?
        var swizzledMethod: Method?

        originalMethod = class_getClassMethod(forClass, Selector(origSelector))
        swizzledMethod = class_getClassMethod(forClass, Selector(withSelector))

        if (originalMethod == COpaquePointer(bitPattern: 0)) { return false }
        if (swizzledMethod == COpaquePointer(bitPattern: 0)) { return false }

        method_exchangeImplementations(originalMethod!, swizzledMethod!)
        return true
    }
}

extension ZZSomeAPI {
    public class func callMock(parameter:String) -> Bool {
      return false
    }
}

所以,testSwizzle()传递意味着混合工作。但testCall()仍会打印true而不是false 是因为当UITest和主要目标是两个不同的应用程序时,只在测试目标上进行调配? 有没有办法解决这个问题?

我找到了Mock API Requests Xcode 7 Swift Automated UI Testing,但我不确定如何在这里使用launchArguments 在示例中只有一种情况,但我需要针对不同的测试方法模拟call()方法以获得不同的结果...如果我使用包含完整响应的launchArgument,例如MOCK_API_RESPONSE要返回,主目标应用程序委托将有一些“丑陋的测试”代码...有没有办法检查(在主目标中)它正在为UITest目标编译,所以它只包括该代码那个嘲笑launchArguments?

最干净的选择确实是调高工作......

2 个答案:

答案 0 :(得分:3)

Xcode UI测试在与您的应用程序不同的应用程序中执行。因此,对测试运行器应用程序中的类的更改不会影响测试应用程序中的类。

这与单元测试不同,在单元测试中,测试在应用程序进程中运行。

答案 1 :(得分:2)

我已经接受了Mats的回答,因为实际的问题(在UI测试中浑浑作响)得到了回答。

但我最终使用的当前解决方案是使用在线模拟服务器http://mocky.io/,因为调模的目标是模拟远程API调用。

使用API​​网址的ZZSomeAPI.swift属性更新了public,而不是将其放入方法中:

import Foundation
public class ZZSomeAPI {
  public static var apiURL: String = NSBundle.mainBundle().infoDictionary?["API_URL"] as! String

  public class func call(parameter:String) -> Bool {
      ... use apiURL ...
  }
}

然后更新了应用委托以使用launchArguments

import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        if NSProcessInfo().arguments.contains("MOCK_API") { // for UI Testing
            if let param = NSProcessInfo().environment["MOCK_API_URL"] {
                ZZSomeAPI.apiURL = param
            }
        }
        return true
    }
}

然后在我的UI测试用例类中创建setupAPIMockWith以在mocky.io on-demand中创建模拟响应:

import XCTest
class ZZSomeClientUITests: XCTestCase {

    override func setUp() {
        super.setUp()
        continueAfterFailure = false
    }

    func setupAPIMockWith(jsonBody: NSDictionary) -> String {
        let expectation = self.expectationWithDescription("mock request setup")
        let request = NSMutableURLRequest(URL: NSURL(string: "http://www.mocky.io/")!)
        request.HTTPMethod = "POST"

        var theJSONText: NSString?
        do {
            let theJSONData = try NSJSONSerialization.dataWithJSONObject(jsonBody, options: NSJSONWritingOptions.PrettyPrinted)
            theJSONText = NSString(data: theJSONData, encoding: NSUTF8StringEncoding)
        } catch {
            XCTFail("failed to serialize json body for mock setup")
        }

        let params = [
            "statuscode": "200",
            "location": "",
            "contenttype": "application/json",
            "charset": "UTF-8",
            "body": theJSONText!
        ]
        let body = params.map({
            let key = $0.0.stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet())
            let value = $0.1.stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet())
            return "\(key!)=\(value!)"
        }).joinWithSeparator("&")
        request.HTTPBody = body.dataUsingEncoding(NSUTF8StringEncoding)
        request.setValue("application/x-www-form-urlencoded; charset=utf-8", forHTTPHeaderField: "Content-Type")

        var url: String?

        let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
            data, response, error in

            XCTAssertNil(error)

            do {
                let json: NSDictionary = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as! NSDictionary
                XCTAssertNotNil(json["url"])
                url = json["url"] as? String
            } catch {
                XCTFail("failed to parse mock setup json")
            }

            expectation.fulfill()
        }

        task.resume()

        self.waitForExpectationsWithTimeout(5, handler: nil)
        XCTAssertNotEqual(url, "")

        return url!
    }

    func testCall() {
        let app = XCUIApplication()
        app.launchArguments.append("MOCK_API")
        app.launchEnvironment = [
            "MOCK_API_URL": self.setupAPIMockWith([
                    "msg": [
                        "code": -99,
                        "text": "yoyo"
                    ]
                ])
        ]
        app.launch()

        app.childrenMatchingType(.Window).elementBoundByIndex(0).childrenMatchingType(.Other).element.childrenMatchingType(.Other).elementBoundByIndex(1).childrenMatchingType(.Button).elementBoundByIndex(0).tap()
        app.staticTexts["yoyo"].tap()
    }

}