@Override
    public Set<JobID> getRunningJobIds() {
        return new HashSet<>(this.jobManagerRunners.keySet());
    }
@Test
    void testGetRunningJobIds() {
        assertThat(testInstance.getRunningJobIds()).isEmpty();

        final JobID jobId0 = new JobID();
        final JobID jobId1 = new JobID();
        testInstance.register(TestingJobManagerRunner.newBuilder().setJobId(jobId0).build());
        testInstance.register(TestingJobManagerRunner.newBuilder().setJobId(jobId1).build());

        assertThat(testInstance.getRunningJobIds()).containsExactlyInAnyOrder(jobId0, jobId1);
    }