public DoubleArrayAsIterable usingExactEquality() {
    return new DoubleArrayAsIterable(EXACT_EQUALITY_CORRESPONDENCE, iterableSubject());
  }
@Test
  public void usingExactEquality_contains_nullExpected() {
    expectFailureWhenTestingThat(array(1.1, 2.2, 3.3)).usingExactEquality().contains(null);
    assertFailureKeys(
        "value of",
        "expected to contain",
        "testing whether",
        "but was",
        "additionally, one or more exceptions were thrown while comparing elements",
        "first exception");
    assertFailureValue("expected to contain", "null");
    assertThatFailure()
        .factValue("first exception")
        .startsWith("compare(1.1, null) threw java.lang.NullPointerException");
  }