e2e-tests directory allows testing the Biome CLI directly. Each directory in e2e-tests is a test that represents a project using Biome. Every directory must include a shell script named test.sh. The exit status of the script determines if the test passed or failed.

For example, the following script executes biome lint:

# fail if any command fail or if some variables are undefined
set -eu

cargo run --bin biome -- lint src

If the command reports lint error, then the script fails and makes the test fails. The working directory is always set to the directory that holds test.sh.