MainWindowTest.java

    public void loadFileOKTest()
        throws IOException
    {
        final File file = mock(File.class);
        final String content = "file contents";

        doReturn(file).when(presenter).getInputFile();
        doReturn(content).when(presenter).getContents(file);

        final InOrder inOrder = inOrder(presenter, view);

        ui.loadInput(mock(ActionEvent.class));
        
        inOrder.verify(presenter).getInputFile();
        inOrder.verify(presenter).getContents(file);
        inOrder.verify(view).setInputText(content);
        inOrder.verifyNoMoreInteractions();
    }