### Question:
QueuedExecutions { public boolean isEmpty() { return this.queuedFlowList.isEmpty() && this.queuedFlowMap.isEmpty(); } QueuedExecutions(final long capacity); Pair<ExecutionReference, ExecutableFlow> fetchHead(); void dequeue(final int executionId); void enqueue(final ExecutableFlow exflow, final ExecutionReference ref); void enqueueAll(
      final Collection<Pair<ExecutionReference, ExecutableFlow>> collection); Collection<Pair<ExecutionReference, ExecutableFlow>> getAllEntries(); boolean hasExecution(final int executionId); ExecutableFlow getFlow(final int executionId); ExecutionReference getReference(final int executionId); long size(); boolean isFull(); boolean isEmpty(); void clear();  }### Answer:
@Test public void testIsEmpty() throws IOException, ExecutorManagerException { final QueuedExecutions queue = new QueuedExecutions(5); final List<Pair<ExecutionReference, ExecutableFlow>> dataList = getDummyData(); Assert.assertTrue(queue.isEmpty()); queue.enqueueAll(dataList); Assert.assertEquals(queue.size(), 2); queue.clear(); Assert.assertTrue(queue.isEmpty()); }