### Question:
RqueueCounter implements RqueueMetricsCounter { @Override public void updateFailureCount(String queueName) { queueCounter.updateFailureCount(queueName); } RqueueCounter(QueueCounter queueCounter); @Override void updateFailureCount(String queueName); @Override void updateExecutionCount(String queueName);  }### Answer:
@Test public void updateFailureCount() { rqueueCounter.updateFailureCount(queueName); verify(queueCounter, times(1)).updateFailureCount(queueName); }