@Override
    public JobManagerRunner get(JobID jobId) {
        assertJobRegistered(jobId);
        return this.jobManagerRunners.get(jobId);
    }
@Test
    void testGet() {
        final JobID jobId = new JobID();
        final JobManagerRunner jobManagerRunner =
                TestingJobManagerRunner.newBuilder().setJobId(jobId).build();
        testInstance.register(jobManagerRunner);

        assertThat(testInstance.get(jobId)).isEqualTo(jobManagerRunner);
    }