### Question:
GuidePostsCacheWrapper { void invalidateAll(){ guidePostsCache.invalidateAll(); } GuidePostsCacheWrapper(GuidePostsCache guidePostsCache); void invalidateAll(TableDescriptor htableDesc); void invalidateAll(PTable table);  }### Answer:
@Test(expected = NullPointerException.class) public void invalidateAllTableDescriptorNull() { TableDescriptor tableDesc = null; wrapper.invalidateAll(tableDesc); }
@Test(expected = NullPointerException.class) public void invalidateAllPTableNull(){ PTable ptable = null; wrapper.invalidateAll(ptable); }