如何运行HDFS的测试类？

Configuration conf = new Configuration();
conf.set("fs.defaultFS", "hdfs://localhost:9000");

FileSystem fs = FileSystem.get(conf);

// 创建一个新文件
Path filePath = new Path("/test/file.txt");
FSDataOutputStream outputStream = fs.create(filePath);
outputStream.writeBytes("Hello, HDFS!");
outputStream.close();

// 读取文件内容
FSDataInputStream inputStream = fs.open(filePath);
byte[] buffer = new byte[1024];
int bytesRead = inputStream.read(buffer);
String content = new String(buffer, 0, bytesRead);
inputStream.close();

System.out.println("File content: " + content);

// 删除文件
fs.delete(filePath, false);