public Object set(final String property, final Object value) {
    Objects.requireNonNull(value, "value");
    final Object parsed = parser.parse(property, value);
    return props.put(property, parsed);
  }
@Test(expected = IllegalArgumentException.class)
  public void shouldNotAllowUnknownConsumerPropertyToBeSet() {
    realProps.set(StreamsConfig.CONSUMER_PREFIX + "some.unknown.prop", "some.value");
  }