public void mix() {
    LOGGER.info("Mixing the stew we find: {} potatoes, {} carrots, {} meat and {} peppers",
        numPotatoes, numCarrots, numMeat, numPeppers);
  }
@Test
  void testMix() {
    final var stew = new ImmutableStew(1, 2, 3, 4);
    final var expectedMessage = "Mixing the immutable stew we find: 1 potatoes, "
        + "2 carrots, 3 meat and 4 peppers";

    for (var i = 0; i < 20; i++) {
      stew.mix();
      assertEquals(expectedMessage, appender.getLastMessage());
    }

    assertEquals(20, appender.getLogSize());
  }