% ls -l target
lrwxrwxrwx 1 delan users 25 Sep 28 15:34 target -> /cuffs/build/servo/target

% target/debug/servo
thread 'main' panicked at 'Can't read file: Os { code: 2, kind: NotFound, message: "No such file or directory" }', ports/servoshell/resources.rs:78:24
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

% ./mach test-unit ports/servoshell/prefs.rs -- -- --test-threads 1
NOTE: Entering nix-shell etc/shell.nix
      Timing report saved to /cuffs/code/servo/target/cargo-timings/cargo-timing-20231011T093548Z.html
    Finished test [unoptimized + debuginfo] target(s) in 0.68s
     Running unittests main.rs (target/debug/deps/servo-ee8531062619dcd4)

running 2 tests
test prefs::test_invalid_prefs_from_command_line_panics ... FAILED
test prefs::test_parse_pref_from_command_line ... FAILED

failures:

---- prefs::test_invalid_prefs_from_command_line_panics stdout ----
thread 'prefs::test_invalid_prefs_from_command_line_panics' panicked at 'Can't find file: prefs.json: Os { code: 2, kind: NotFound, message: "No such file or directory" }', components/embedder_traits/resources.rs:116:18
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'prefs::test_invalid_prefs_from_command_line_panics' panicked at 'Message should describe the problem', ports/servoshell/prefs.rs:120:5

---- prefs::test_parse_pref_from_command_line stdout ----
thread 'prefs::test_parse_pref_from_command_line' panicked at 'Once instance has previously been poisoned', /home/delan/.cargo/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.4.0/src/inline_lazy.rs:30:16


failures:
    prefs::test_invalid_prefs_from_command_line_panics
    prefs::test_parse_pref_from_command_line

test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 3 filtered out; finished in 0.00s

error: test failed, to rerun pass `-p servoshell --bin servo`