@Test
  public void hasNoClipboardContents() {
    when(clipboardHistory.hasContents()).thenReturn(false);

    action.performAction(nodes);

    verifyZeroInteractions(clipboard, dialogDisplayer);
  }
  @Test
  public void hasClipboardContentsAndUserCancels() {
    when(clipboardHistory.hasContents()).thenReturn(true);
    when(dialogDisplayer.display(clipboardHistory)).thenReturn(-1);

    action.performAction(nodes);

    verifyZeroInteractions(clipboard);
  }
  @Test
  public void hasClipboardContentsAndUserSelectsSomethingToPaste() {
    InOrder inOrder = inOrder(clipboardHistory, clipboard, pasteAction);

    when(clipboardHistory.hasContents()).thenReturn(true);
    when(dialogDisplayer.display(clipboardHistory)).thenReturn(1);
    when(clipboardHistory.top()).thenReturn("value");
    when(actionMap.get("paste")).thenReturn(pasteAction);

    action.performAction(nodes);

    inOrder.verify(clipboardHistory).moveToTop(1);
    inOrder.verify(clipboard).setContents(isA(StringSelection.class), isA(StringSelection.class));
    inOrder.verify(pasteAction).actionPerformed(isA(ActionEvent.class));
  }