### Question:
ParameterMetricStorage { public static ParameterMetric getParamMetric(ResourceWrapper resourceWrapper) { if (resourceWrapper == null || resourceWrapper.getName() == null) { return null; } return metricsMap.get(resourceWrapper.getName()); } private  ParameterMetricStorage(); static void initParamMetricsFor(ResourceWrapper resourceWrapper, /*@Valid*/ ParamFlowRule rule); static ParameterMetric getParamMetric(ResourceWrapper resourceWrapper); static ParameterMetric getParamMetricForResource(String resourceName); static void clearParamMetricForResource(String resourceName);  }### Answer:
@Test public void testGetNullParamMetric() { assertNull(ParameterMetricStorage.getParamMetric(null)); }