### Question:
OvsdbMonitorCallback implements MonitorCallBack { @Override public void exception(Throwable exception) { LOG.warn("exception", exception); } OvsdbMonitorCallback(InstanceIdentifierCodec instanceIdentifierCodec, OvsdbConnectionInstance key,
            TransactionInvoker txInvoker); @Override void update(TableUpdates result, DatabaseSchema dbSchema); @Override void exception(Throwable exception);  }### Answer:
@Test public void testException() { ovsdbMonitorCallback.exception(mock(Throwable.class)); verify(ovsdbMonitorCallback).exception(any(Throwable.class)); }