charset/ -> encoding tests (Nim)
dhtml/ -> dynamic layout tests (scripting="app")
layout/ -> static layout tests (scripting=false)
js/ -> DOM tests (scripting=true or scripting="app" depending on extension)
md/ -> markdown tests
net/ -> XHR tests etc. (served from an HTTP server)
nim/ -> module-specific unit tests
pager/ -> config, pager JS tests
