public void isEqualTo(@Nullable Object expected) {
    standardIsEqualTo(expected);
  }
@Test
  public void isEqualToStringWithNullVsNull() {
    expectFailure.whenTesting().that("null").isEqualTo(null);
    assertFailureKeys("expected", "an instance of", "but was", "an instance of");
    assertFailureValue("expected", "null");
    assertFailureValueIndexed("an instance of", 0, "(null reference)");
    assertFailureValue("but was", "(non-equal value with same string representation)");
    assertFailureValueIndexed("an instance of", 1, "java.lang.String");
  }