Complex tests which by one call touches a lot of things. These are the tests which are going to fail
with high probability if something goes wrong. Instead of running a regular testing which takes time,
we should run these one in the first order to save time during earlier problem detection.
The smoke tests should not take much time. If something failed do not try to analyse what happened.
Run tests for that topic instead and find failed simple tests.

Eg. if failed test is `t/smoke/formdata.t`, then run `prove -Ilib -Ilocal/lib/perl5 -It/lib t/*/formdata*`.
