@Test
public void testGetAllVariables() {

	MetricRegistryImpl registry = new MetricRegistryImpl(MetricRegistryConfiguration.defaultMetricRegistryConfiguration());
	AbstractMetricGroup group = new AbstractMetricGroup<AbstractMetricGroup<?>>(registry, new String[0], null) {
		@Override
		protected QueryScopeInfo createQueryServiceMetricInfo(CharacterFilter filter) {
			return null;
		}
		@Override
		protected String getGroupName(CharacterFilter filter) {
			return "";
		}
	};
	assertTrue(group.getAllVariables().isEmpty());
	registry.shutdown();
}