FileManager.CreateFileatPath在单位测试期间失败

Question

当前我正在尝试在单元测试期间创建文件，以查看我是否可以在创建数据后检索数据，但是FileManager.CreateFileatPath总是失败。我看了这篇文章：filemanager.createfileatpath总是失败了，我实现了该答案的解决方案，但仍然失败了。这就是单位测试和随附功能的样子：

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是什么。看来我正在创建一个文件夹作为文件路径，并试图将文件保存到该路径。由于它是一个文件，而不是文件夹，因此正在返回已经存在某些东西。

这是完成的工作代码的样子：

  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)
    }