assertThrows(IllegalArgumentException.class, () -> parse("weakValues, softValues"));

    assertThrows(IllegalArgumentException.class, () -> parse("weakValues, weakValues"));
  }

  public void testParse_writeExpirationDays() {
    CacheBuilderSpec spec = parse("expireAfterWrite=10d");
    assertThat(spec.initialCapacity).isNull();
    assertThat(spec.maximumSize).isNull();
    assertThat(spec.maximumWeight).isNull();