Mockito inOrder.verify（）使用mock作为函数参数失败

Question

I'm trying to write a unit test that checks if methods were invoked in an order. To do that I'm using Mockito's inOrder.verify() like this:

@Test
public void shouldExecuteAllFileCommandsOnAFileInFIFOOrder() {
    // Given
    ProcessFileListCommand command = new ProcessFileListCommand();

    FileCommand fileCommand1 = mock(FileCommand.class, "fileCommand1");
    command.addCommand(fileCommand1);

    FileCommand fileCommand2 = mock(FileCommand.class, "fileCommand2");
    command.addCommand(fileCommand2);

    File file = mock(File.class, "file");
    File[] fileArray = new File[] { file };

    // When
    command.executeOn(fileArray);

    // Then
    InOrder inOrder = Mockito.inOrder(fileCommand1, fileCommand2);
    inOrder.verify(fileCommand1).executeOn(file);
    inOrder.verify(fileCommand2).executeOn(file);
}

However, the second verify() fails with the following error:

org.mockito.exceptions.verification.VerificationInOrderFailure: 
Verification in order failure
Wanted but not invoked:
fileCommand2.executeOn(file);
-> at (...)
Wanted anywhere AFTER following interaction:
fileCommand1.executeOn(file);
-> at (...)

If I change .executeOn(file) to .executeOn(any(File.class)) the test passes, but I want to make sure that the methods are invoked using the same argument.

Here's the class I'm testing:

public class ProcessFileListCommand implements FileListCommand {

    private List<FileCommand> commands = new ArrayList<FileCommand>();

    public void addCommand(final FileCommand command) {
        this.commands.add(command);
    }

    @Override
    public void executeOn(final File[] files) {
        for (File file : files) {
            for (FileCommand command : commands) {
                file = command.executeOn(file);
            }
        }
    }
}

Answer 1

测试失败，因为第二个executeOn()方法调用的参数与第一个参数的参数不同，因为第一个文件被另一个文件替换。

 file = command.executeOn(file);