public void GivenInput_MatchesShouldReturn(double?lowerBoundary, double?upperBoundary, double testValue, bool expected)
        {
            // arrange
            var sut = new Severity
            {
                LowerBoundary = lowerBoundary,
                UpperBoundary = upperBoundary,
                Value         = -1,
            };

            // act
            var actual = sut.Matches(testValue);

            // assert
            Assert.Equal(expected, actual);
        }