Need a clear explanation of Champion vs Challenger testing in default program trigger campaigns

[Nate_Oosterhous]

Hi All,

I am in need of a clear explanation of how champion vs challenger testing actually functions when only one person is added to a trigger campaign at once so there for only one email will go out at once.  I am largely unclear on how the distribution works if only one email goes out at a time.  I have searched the community but I am struggling for clarity on this.