private void verifyStartLifecycle() {
    verify(this.systemAdmins).start();
    verify(this.startpointManager).start();
  }
Set up mocks for {@link JobCoordinatorMetadataManager}.
{@code jobMetadataChanges} defines which changes should be detected by the {@link JobCoordinatorMetadataManager}
samza-core/src/test/java/org/apache/samza/coordinator/staticresource/TestStaticResourceJobCoordinator.java