public static <T> SamplerFunction<T> neverSample() {
    return (SamplerFunction<T>) Constants.NEVER_SAMPLE;
  }
@Test void neverSample_returnsFalse() {
    assertThat(neverSample().trySample(null)).isFalse();
    assertThat(neverSample().trySample("1")).isFalse();
  }