On my laptop, running `./mach test-unit` goes from about 11 minutes to 22 seconds, when run after `./mach build`. Fix #5291. Source-Repo: https://github.com/servo/servo Source-Revision: 017d1053617f6769d7f355e4a97d52ae67e53d1c
Source-Repo: https://github.com/servo/servo Source-Revision: 3924652aa3d43fc10917e46cbb1a955bd0495614
Source-Repo: https://github.com/servo/servo Source-Revision: b1305bb7d051f83850c51bb0da0ccc86a5e07922