### Question:
WroServletContextListener implements ServletContextListener { public final void setConfiguration(final WroConfiguration configuration) { notNull(configuration); this.configuration = configuration; }  final void contextInitialized(final ServletContextEvent event); final void contextDestroyed(final ServletContextEvent servletContextEvent); final void setManagerFactory(final WroManagerFactory managerFactory); final void setConfiguration(final WroConfiguration configuration);  }### Answer:
@Test(expected = NullPointerException.class) public void cannotSetNullWroConfiguration() { victim.setConfiguration(null); }