public DoubleArrayAsIterable usingExactEquality() {
    return new DoubleArrayAsIterable(EXACT_EQUALITY_CORRESPONDENCE, iterableSubject());
  }
@Test
  public void usingExactEquality_contains_failure() {
    expectFailureWhenTestingThat(array(1.1, OVER_2POINT2, 3.3)).usingExactEquality().contains(2.2);
    assertFailureKeys("value of", "expected to contain", "testing whether", "but was");
    assertFailureValue("expected to contain", "2.2");
    assertFailureValue("testing whether", "actual element is exactly equal to expected element");
    assertFailureValue("but was", "[1.1, " + OVER_2POINT2 + ", 3.3]");
  }