### Question:
ServletContextAttributeHelper { final Object getAttribute(final Attribute attribute) { Validate.notNull(attribute); return servletContext.getAttribute(getAttributeName(attribute)); } ServletContextAttributeHelper(final ServletContext servletContext);  ServletContextAttributeHelper(final ServletContext servletContext, final String name); static ServletContextAttributeHelper create(final FilterConfig filterConfig); WroManagerFactory getManagerFactory(); WroConfiguration getWroConfiguration(); void setWroConfiguration(final WroConfiguration config); void setManagerFactory(final WroManagerFactory managerFactory); void clear(); static final String DEFAULT_NAME; }### Answer:
@Test(expected = NullPointerException.class) public void cannotGetObjectForNullAttribute() { victim.getAttribute(null); }