Depends on what you call a repo. I run git init almost everywhere (including my $PERL5LIB to easily switch between various versions of CPAN modules), and as I own several computers (desktop + 2 laptops), I usually need everything on all of them. GitHub nowadays offers private repos for free, but I still use a USB flash drive from the times when it didn't where I create --bare repos for all my personal projects and set them as remote origin.

> I organized the tests using the same structure as my modules

Interestingly, we used the same strategy at $job - 2. There were hundreds of modules and it was surprisingly easy to find the corresponding tests for the file one had just modified.