@Test
public void testValidateOkMandatoryFieldsForEvents()
    throws IOException
{

    TrackerBundleParams bundleParams = createBundleFromJson( "tracker/event_events_and_enrollment.json" );
    TrackerBundle trackerBundle = trackerBundleService.create( bundleParams );
    trackerBundle = trackerBundleService.runRuleEngine( trackerBundle );
    Map<String, List<String>> errors = implementerToTest.validateEvents( trackerBundle );
    assertFalse( errors.isEmpty() );
    errors.entrySet().stream()
        .forEach( e -> assertTrue( e.getValue().isEmpty() ) );
}