#!/bin/sh
# script/test: run the test suite. Testing is a phase of the Dockerfile
# and this builds that phase alone, on the same terms as script/lint:
# --target because a phase that is not the last stage is built only when
# named, and a new CACHEBUST value because a cached test layer is a test
# that did not run; unlike --no-cache, it keeps the layers above the ARG
# CACHEBUST line and the cache mounts. This relies on every stage of the
# Dockerfile declaring ARG CACHEBUST before every step that lints, tests
# or compiles; a stage without that line is served from cache on an
# unchanged tree, with no warning. --output type=cacheonly writes no
# image, since nothing uses one.
set -eu

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
ROOT="$(cd "$SCRIPT_DIR/.." && pwd -P)"

main() {
    cd "$ROOT"
    docker build --build-arg CACHEBUST="$(date +%s)-$$" \
        --target test \
        --output type=cacheonly .
}

main "$@"
