tests: check that builtins.fetchGit { ..., ref = "HEAD"; } works
tests: check that builtins.fetchGit { ..., ref = "HEAD"; } works

rycee/nix,rycee/nix,NixOS/nix,rycee/nix,rycee/nix,NixOS/nix,NixOS/nix,rycee/nix,NixOS/nix,NixOS/nix