@Test(expected = ReadFailedException.class)
public void readNodeTestWithException() throws Throwable {
doThrow(new NullPointerException("no Node")).when(DATA_TREE_MODIFICATION).readNode(any());
@Test(expected = ReadFailedException.class)
public void readNodeTestWithException() throws Throwable {
doThrow(new NullPointerException("no Node")).when(DATA_TREE_MODIFICATION).readNode(any());