@Test public void customRandomizerShouldBeRegisteredInAllBuiltInstances() throws BeanPopulationException { PopulatorBuilder builder = aNewPopulatorBuilder(); builder.registerRandomizer(Human.class, String.class, "name", randomizer); Populator populator = builder.build(); Human human = populator.populateBean(Human.class); assertThat(human.getName()).isEqualTo(NAME); Populator populator2 = builder.build(); Human human2 = populator2.populateBean(Human.class); assertThat(human2.getName()).isNotEqualTo(NAME); }