public void Should_fail_when_asserting_nullable_numeric_value_equals_a_different_value()
            {
                // Arrange
                DateOnly?nullableDateOnlyA = new DateOnly(2016, 06, 04);
                DateOnly?nullableDateOnlyB = new DateOnly(2016, 06, 06);

                // Act
                Action action = () =>
                                nullableDateOnlyA.Should().Be(nullableDateOnlyB);

                // Assert
                action.Should().Throw <XunitException>();
            }