[new-rule] formatting specifiers in .each test names

[ark120202]

In .each test (and describe block) names it's possible to use printf-like formatting.
I would like to have a new rule (or 2 rules) that would:

• Enforce usage of at least one specifier in .each test name (should it be a part of no-identical-title?)
• Disallow usage of these specifiers in regular test names, since it likely means it was left from some older version of test

[jeysal]

Good idea. Would recommend not putting it into no-identical-title because a config option seems weird for a completely separate part of rule logic. Might want to include both suggestions in one though since they share the format string parsing of test names.

[petr-motejlek]

I was just today trying to see whether no-identical-title would help me remember to put at least : %p at the end of my .each blocks :).

Turns out it doesn't, and +1 to this issue -- having any way to force myself to not forget, would be great, regardless if it's the no-identical-title or any other rule that I have to enable.

Cheers