ios - fileManager.createFileAtPath 在单元测试期间失败

Question

目前，我正在尝试在单元测试期间创建文件，看看是否可以在创建后检索数据，但 fileManager.createFileAtPath 总是失败。我看了这个帖子:fileManager.createFileAtPath always fails我实现了该答案的解决方案，但仍然失败。这是单元测试和附带函数的样子:

internal func getCacheFolderPath() -> String {
    var folderPath = ""
    guard let path = self.urls(for:.cachesDirectory , in: .userDomainMask).last?.path else {
        return folderPath
    }

    folderPath = path + "/NetworkCache"
    if !self.fileExists(atPath: folderPath) {
        do {
            try  self.createDirectory(atPath: folderPath, withIntermediateDirectories: false, attributes: nil)
        } catch {
            print(error.localizedDescription)
        }
    }

    return folderPath
}

func test_createFile(){
    let path = sut?.getCacheFolderPath()
    let fileManager = FileManager.default

    if !FileManager.default.fileExists(atPath: path!) {
        do {
            try FileManager.default.createDirectory(atPath: path!, withIntermediateDirectories: true, attributes: nil)
        } catch let error as NSError {
            print(error.localizedDescription)
        }
    }

    let isFileCreated = fileManager.createFile(atPath: path!, contents: mockData, attributes: nil)

    print(isFileCreated)//This always returns false
}

Answer 1

使用 data.write(to:) 而不是创建文件有助于确定问题所在。看起来我正在创建一个文件夹作为文件路径并尝试将文件保存到该路径。由于它是一个文件而不是文件夹，因此它返回那里已经存在某些内容。

以下是完整的工作代码:

  func saveData(data: Data, forFileName fileName: String, completionHandler: @escaping (URL?)->()) {
        let url = URL(fileURLWithPath: self.filePathForFileName(name: fileName))
        print("saveData:\(url)")
        do {
           // [data writeToFile:[self thdncFilePathForFileName:name] atomically:YES];
            try  data.write(to: url, options: .atomic)
              completionHandler(url)
        } catch  {
            print(error.localizedDescription)
            completionHandler(nil)

        }
    }


 func test_createFile(){

        var isSaved: Bool = false

        let path = sut?.getCacheFolderPath()

        let promise = expectation(description: "Completion Hander invoked")


        if !FileManager.default.fileExists(atPath: path!)
        {
            do {
                try FileManager.default.createDirectory(atPath: path!, withIntermediateDirectories: true, attributes: nil)
            } catch let error as NSError {
                print(error.localizedDescription)
            }
        }
        sut?.saveData(data: mockData!, forFileName: filePath, completionHandler: { (url) in

            let fileManager = MockFileManager.default

            if fileManager.fileExists(atPath: self.sut!.filePathForFileName(name: self.filePath)) {
                isSaved = true
                print("FILE AVAILABLE")

            } else {
                isSaved = false
                print("FILE NOT AVAILABLE")
            }

            promise.fulfill()
        })

        wait(for: [promise], timeout: 10, enforceOrder: true)
        XCTAssertTrue(isSaved)
    }