public void ValidateShortNotToBeOneOfExpectedValues()
        {
            // Given
            var validator = new NullableShortInverseValidator(42);

            // When
            validator.BeOneOf(new short?[] { 10, 39 });

            // Then
            Assert.True(true);
        }
        public void ValidateNullableShortNotToBeOneOfViolated()
        {
            // Given
            var validator = new NullableShortInverseValidator(null);

            // When
            var exception = Assert.Throws <XunitException>(() => validator.BeOneOf(new short?[] { null, 42 }, because: "that's the bottom line"));

            // Then
            Assert.NotNull(exception);
            var rn = Environment.NewLine;

            Assert.Equal(
                $"{rn}validator{rn}is \"\"{rn}but was expected not to be one of the following values: \"\", \"42\"{rn}because that's the bottom line",
                exception.UserMessage);
        }