@Test
    @Ignore
    public void testAllMethodsOverridden() {
        List <Method> unmasked = com.yahoo.protect.ClassValidator.unmaskedMethodsFromSuperclass(Common.class);
        System.out.println(unmasked);
        assertEquals(unmasked.size(), 0); // probably not needed
    }
Packs the given doc to Book
@param d doc, never null
@return a Book object or null if input doc isn't a Book
documentgen-test/src/test/java/com/yahoo/vespa/config/DocumentGenPluginTest.java