public void AbsoluteValue_ShouldReturnValidResult_ForInt16() { // Arrange. Int16 negativeTwo = -2; Int16 zero = 0; Int16 two = 2; // Act. var resultOne = negativeTwo.AbsoluteValue(); var resultTwo = zero.AbsoluteValue(); var resultThree = two.AbsoluteValue(); // Assert. resultOne.Should().Be(2); resultTwo.Should().Be(0); resultThree.Should().Be(2); }