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