### Question:
FlowCacheFilter { public static FlowCacheFilterBuilder builder(){ return new FlowCacheFilterBuilder(); } private  FlowCacheFilter(FlowCacheFilterBuilder builder); String getValue(); static FlowCacheFilterBuilder builder();  }### Answer:
@Test public void testBuilder() { FlowCacheFilter.FlowCacheFilterBuilder builder = null; try { builder = FlowCacheFilter.builder(); } catch (Exception e) { fail("Exception thrown: " + e.getMessage()); } assertNotNull(builder); }