@Test
public void testPostHandleNullStartAttr() throws Exception {

    // parameter create
    HandlerMethod paramHandler = new HandlerMethod(controller, TraceLoggingInterceptorController.class
            .getMethod("createForm"));
    request.setAttribute(TraceLoggingInterceptor.class.getName()
            + ".startTime", null);
    try {
        // run
        interceptor.postHandle(request, response, paramHandler, null);
    } catch (Exception e) {
        fail("illegal case");
    }
    // expected
    String expectedLogStr = "[HANDLING TIME   ] TraceLoggingInterceptorController.createForm()->";
    // assert
    verifyLogging(expectedLogStr, ImmutableList.of(Level.WARN), 1);
}