In an answer to another questionanother question, I suggested creating a randomized value for input to a specific method. In my experience this has been useful for making tests more readable and it lets you skip the "trivial phase" where you hardcode specific results in a method.
Here's the unit test code pasted from the other answer, for quick reference:
[Test]
public void FullHouseReturnsTrue()
{
var roll = AnyFullHouse();
Assert.That(sut.IsFullHouse(roll));
}
[Test]
public void StraightReturnsFalse()
{
var roll = AnyStraight();
Assert.That(sut.IsFullHouse(roll), Is.False);
}
A couple of comments in response suggested that this strategy would not work well, because the helper method would need to be tested also. In my experience, I've never had a need to test methods like this, since creating the corresponding production code also tests my test code.
Do AnyStraight() and AnyFullHouse() need to have their own unit tests? If so, how do you solve the chicken-and-egg problem that presents?
EDIT
Would I still want to create dedicated unit tests for the AnyFullHouse algorithm if I inlined the method?
[Test]
public void FullHouseReturnsTrue()
{
var roll = listOfHardCodedFullHouseRolls[_random.Next(0, listOfHardCodedFullHouseRolls.Length)];
Assert.That(sut.IsFullHouse(roll));
}