Automated testing, advanced topic warn

[joaquinelio]

No description provided.

[joaquinelio]

Edited

Why:
Reading Disqus comments (in Spanish and English), I noticed that

Vets like/love the artcle,
but beginners feel very frustrated to find it so early in the tutorial.

Hence the warning.
The article is not that hard, I bet the warning will ease the learning stress.
It may even be a single line instead of the warning box.

The warning is a rephrased copy from the last line.
.

[smith558]

@iliakan this may require an input from you