Swift：测试Segue是否存在,有正确的目的地并改变正确的东西

概述我是快速测试的新手,目前我想尝试四项测试.我有一个从ViewController到另一个的segue(searchingForViewController).对于这个segue,我想测试这4件事： >是否存在标识符为“searchSegue”的segue？ >是否会调用segue然后点击按钮搜索？ > Seogle的目的地是SearchedForViewController > Segue将Sea 我是快速测试的新手,目前我想尝试四项测试.我有一个从VIEwController到另一个的segue(searchingForVIEwController).对于这个segue,我想测试这4件事：

>是否存在标识符为“searchSegue”的segue？
>是否会调用segue然后点击按钮搜索？
> SEOgle的目的地是SearchedForVIEwController
> Segue将SearchedForVC的变量“passstring”更改为“garten”吗？

我在Main.storyboard中的segue如下所示：

我的segue代码如下(工作,但未来我只想知道如何测试)：

overrIDe func prepare(for segue: UIStoryboardSegue,sender: Any?) {        if segue.IDentifIEr == "searchSegue" {            guard let controller = segue.destination as? SearchedForVIEwController         else {                return            }                controller.passedString = "garten"        }    }

目前我的测试类就像是空的,看起来像这样(只是加载视图)：

class VIEwControllerTests: XCTestCase {    var vc: VIEwController!    overrIDe func setUp() {        super.setUp()        let storyboard = UIStoryboard(name: "Main",bundle: Bundle.main)        vc = storyboard.instantiateVIEwController(withIDentifIEr: "test") as! VIEwController        let _ = vc.vIEw    }    func testSegueShouldExist() {        let IDentifIErs = getSegues(ofVIEwController: vc)        XCTAssertEqual(IDentifIErs.count,1,"Segue count should equal one.")        XCTAssertTrue(IDentifIErs.contains("searchSegue"),"Segue searchSegue should exist.")     }    func testSegueActionsThenPushSearchbutton() {        // code here      }    func testSegueDirectsToSearchedForVIEwController() {        // code here      }    func testSeguePassedGartenAsValuetoSearchedForVC() {        // call prepare and test after?     }}

编辑我发现了如何实现segueShouldExist.我添加了代码.它调用辅助函数：

func getSegues(ofVIEwController vIEwController: UIVIEwController) -> [String] {        let IDentifIErs = (vIEwController.value(forKey: "storyboardSegueTemplates") as? [AnyObject])?.flatMap({ 
# VIEwControllerTests.swiftvar capturedSegue: UIStoryboardSegue?extension VIEwController {    overrIDe open func prepare(for segue: UIStoryboardSegue,sender: Any?) {        prepareSearchForVC(with: segue)        capturedSegue = segue    }}class VIEwControllerTests: XCTestCase {    var vc: VIEwController!    overrIDe func setUp() {        super.setUp()        let storyboard = UIStoryboard(name: "Main",bundle: Bundle.main)        vc = storyboard.instantiateInitialVIEwController() as! VIEwController        vc.loadVIEwIfNeeded()    }    func testSegueShouldExist() {        let IDentifIErs = getSegues(ofVIEwController: vc)        XCTAssertEqual(IDentifIErs.count,"Segue searchSegue should exist.")    }    func testSegueActionsThenPushSearchbutton() {        // Can programmatically send actions to UIControl classes        vc.searchbutton.sendActions(for: .touchUpInsIDe)        // Just makes sure any segue was called        // since there is only one in this case there's no need to be more specific        XCTAssertNotNil(capturedSegue)     }    func testSegueDirectsToSearchedForVIEwController() {        vc.performSegue(withIDentifIEr: "searchSegue",sender: nil)        // Attempts to cast the captured segue        let destination = capturedSegue?.destination as? SearchedForVC        XCTAssertNotNil(destination,"Destination should be searched for controller")    }    func testSeguePassedGartenAsValuetoSearchedForVC() {        vc.performSegue(withIDentifIEr: "searchSegue",sender: nil)        let destination = capturedSegue?.destination as? SearchedForVC        XCTAssertEqual(destination?.passedString,"garten")    }    func getSegues(ofVIEwController vIEwController: UIVIEwController) -> [String] {        let IDentifIErs = (vIEwController.value(forKey: "storyboardSegueTemplates") as? [AnyObject])?.flatMap({ 
overrIDe func prepare(for segue: UIStoryboardSegue,sender: Any?) {    if segue.IDentifIEr == "searchSegue" {        guard let controller = segue.destination as? SearchedForVIEwController     else {            return        }            controller.passedString = "garten"    }}
.value(forKey: "IDentifIEr") as? String }) ?? []        return IDentifIErs    }}
.value(forKey: "IDentifIEr") as? String }) ?? []        return IDentifIErs    }

解决方法 要实现这一点,您需要重新调整代码.

overrIDe func prepare(for segue: UIStoryboardSegue,sender: Any?) {    prepareSearchForVC(with: segue)}func prepareSearchForVC(with segue: UIStoryboardSegue) {    if segue.IDentifIEr == "searchSegue" {        guard let controller = segue.destination as? SearchedForVC            else {                return        }        controller.passedString = "garten"    }}

这项工作的原因是改变了VIEwController中的prepare(for：,sender :)方法：

至：

希望有所帮助.

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