void () { LightVirtualFile file = new LightVirtualFile(); TestCase.assertFalse("VirtualFile should NOT be VirtualFileWithId, actual type is " + file.getClass(), file instanceof VirtualFileWithId); TestCase.assertTrue(key.setPersistentValue(file, sample1)); TestCase.assertEquals(sample1, key.getPersistentValue(file)); TestCase.assertTrue(key.setPersistentValue(file, null)); TestCase.assertNull(key.getPersistentValue(file)); }