@Override
    public JobManagerRunner get(JobID jobId) {
        assertJobRegistered(jobId);
        return this.jobManagerRunners.get(jobId);
    }
@Test
    void testGetOnNonExistingJobManagerRunner() {
        assertThatThrownBy(() -> testInstance.get(new JobID()))
                .isInstanceOf(NoSuchElementException.class);
    }