What would subjectively be the name of the directory that you'll place your test files in?

I've seen many projects and libraries on GitHub (and elsewhere) storing test files in a directory named either as 'tests' or 'test', mostly the first one. I've done it for my open-source (and closed-source) projects as well but I prefer 'tests' to denote that there are multiple test files. Though this is purely subjective, this question has always bothered me for which one of the two would sound more appropriate, I guess the plural name 'tests'?

Submitted October 22, 2019 at 07:15PM by myTerminal_