java如何将临时文件夹传递给以文件为参数的方法（JUNIT）

Question

我有一个将File作为参数的方法，我想使用@Rules temporaryFolder对其进行junit测试

以下是我的方法：

    public void processFiles(final File folder)
    {
        
        File[] fileNames = folder.listFiles();
        List<String> lines = new ArrayList<>();
        boolean isFirstFile = true;
        try
        {
            for (File file : fileNames)
            {
                    List<String> list = readContent(file);
                    list.forEach(i -> lines.add(i));
                     
                }
        }catch (IOException e)
        {
            e.printStackTrace();
        }
    }

下面是我想测试它的方法：

 @Rule
 public TemporaryFolder folder = new TemporaryFolder();

 @Test
 public void test() throws IOException {
        
        final File tempFile = temporaryFolder.newFile("tempFile.txt");
        final File tempFile2 = temporaryFolder.newFile("tempFile.txt");
     

        FileUtils.writeStringToFile(tempFile, "content1", "ISO-8859-1");
        
        FileUtils.writeStringToFile(tempFile2, "content2", "ISO-8859-1");
        
        
         //Here I get an error because the parameter should be of type File and not TemporaryFolder 
        listFilesService.processFiles (temporaryFolder);
      
    }

你能帮我正确地编写代码吗 非常感谢

Answer 1

您应该使用TemporaryFolder.getRoot()方法。那么，你的测试将是：

@Rule
public TemporaryFolder temporaryFolder = new TemporaryFolder();

@Test
public void test() throws IOException {

    final File tempFile = temporaryFolder.newFile("tempFile.txt");
    final File tempFile2 = temporaryFolder.newFile("tempFile2.txt");


    FileUtils.writeStringToFile(tempFile, "content1", "ISO-8859-1");

    FileUtils.writeStringToFile(tempFile2, "content2", "ISO-8859-1");


    // Pass the root of the TemporaryFolder which is of type File
    processFiles(temporaryFolder.getRoot());

}

这可以通过在processFiles的for循环中添加System.out.println(file.getName());来验证是否有效。上述测试的输出为：

tempFile.txt
tempFile2.txt