### Question:
SmsRouteTreeLeaf extends SmsRouteTree { @Override SmsRouteTree handles(String serviceName) { if (handlesFunction.apply(serviceName)) { return this; } else { return null; } } SmsRouteTreeLeaf(Map<MatchingResourcePath, CrestAuthorizationModule> authzModules,
            CrestAuthorizationModule defaultAuthzModule, Router router,
            Function<String, Boolean> handlesFunction, Filter filter, ResourcePath path);   }### Answer:
@Test(dataProvider = "handlesFunction") public void handlesShouldReturnThisRouteTreeInstanceIfHandlesFunctionReturnsTrue(String serviceName, SmsRouteTree expectedRouteTree) { SmsRouteTree tree = routeTree.handles(serviceName); assertThat(tree).isEqualTo(expectedRouteTree); }