我有以下设置：

public interface CommandRunner
{
    void run(String cmd, InputStream is) throws IOException;
}

public class CommandRunnerInputFile
{
  private final CommandRunner commandRunner;
  
  public CommandRunnerInputFile(CommandRunner commandRunner) {
    this.commandRunner = commandRunner;
  }
  
  public void run(String command, File inputFile) throws IOException {
    try (FileInputStream is = new FileInputStream(inputFile)) {
      this.commandRunner.run(command, is);
    }
  }

}

@ExtendWith(MockitoExtension.class)
public class TestCommandRunnerInputFile
{
  @Mock CommandRunner commandRunner;
  
  @Captor ArgumentCaptor<InputStream> inputStream;

  
  private CommandRunnerInputFile commandRunnerInputFile;

  @BeforeEach
  void initService() {
    commandRunnerInputFile = new CommandRunnerInputFile(commandRunner);
  }
  
  @Test
  public void testHappyPath() throws IOException {
    ClassLoader classLoader = this.getClass().getClassLoader();
    File file = new File(classLoader.getResource("MyTestInputFile.txt").getFile());

    commandRunnerInputFile .run("MyApplication.exe", file);
    
    verify(commandRunner).run(eq("MyApplication.exe"), inputStream.capture());
    assertEquals('c', (char)inputStream.getValue().read());
  }
}

当我运行这个测试时，它失败了，并出现以下异常：

java.io.IOException: Stream Closed
    at java.io.FileInputStream.read0(Native Method)
    at java.io.FileInputStream.read(FileInputStream.java:207)

这对我来说是有意义的，因为在执行方法的过程中，底层的FileInputStream在完成执行时是关闭的。也就是说，在FileInputStream被Mockito捕获的时间点，它是打开的。但等我确认通过了（并尝试验证其内容）它是关闭的。我能做什么不是简单地捕获InputStream对象本身，而是实际捕获其内容以进行验证？