@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);
  }