1 min readOct 28, 2023

Great question! Relying solely on random values can sometimes miss specific important cases that need to be tested. Let's take a look at an example in C#:

`public int SpecialAdd(int a, int b)`

{

if (a == 42 || b == 42)

{

return 42;

}

return a + b;

}

In this SpecialAdd method, if either a or b is 42, it returns 42. Otherwise, it returns the sum of a and b.

**Here you have four test cases:**

- a is a fixed value of 42, b is random, and the sum is fixed at 42.
- b is a fixed value of 42, a is random, and the sum is fixed at 42.
- Both a and b are fixed values of 42, and the sum is fixed at 42.
- a, b, and their respective sums are all random.

When we discuss the use of random values in testing, it is important to note that we are not referring **to special cases**. Special cases should always be tested separately to ensure full coverage and correctness of the code.