test

#!/bin/bash

set -e
shellcheck ./publish-to-subrepo
set +e

src=$(realpath .)
tests="$(realpath "$src"/tests)/*.sh"

function run_test() {
	test=$1
	echo -n "${test##*/} "

	# create main working directory
	workdir=$(mktemp -d)

	# create monorepo
	monorepo_dir="$workdir/monorepo"
	mkdir "$monorepo_dir"
	pushd "$monorepo_dir" >/dev/null || exit
	git init --quiet -b main
	git config user.email "publish-subrepo-tests@example.com"
	git config user.name "Publish Subrepo Tests"
	popd >/dev/null

	# create empty target subrepo
	subrepo_dir="$workdir/subrepo"
	mkdir "$subrepo_dir"
	pushd "$subrepo_dir" >/dev/null || exit
	git init --quiet -b main
	git config receive.denyCurrentBranch ignore # allow us to push to a non-bare repo
	popd >/dev/null

	# run the test
	echo -n "..."
	pushd "$workdir" >/dev/null || exit
	PATH=$src:$PATH \
		SUBREPO="$subrepo_dir" \
		GIT_CONFIG_GLOBAL=/dev/null \
		bash "$test" 3>"$test.output.actual" \
		1> >(tee "$test.stdout.actual" >&3) \
		2> >(tee "$test.stderr.actual" >&3)
	echo $? >"$test.exit-status.actual"
	popd >/dev/null
	echo -ne "\b\b\b   \b\b\b"

	# check that the subrepo contains what we expect
	pushd "$subrepo_dir" >/dev/null || exit
	git reset --hard --quiet # sync local index with what's been pushed
	if [[ ! $(git log 2>&1) =~ "fatal" ]]; then
		git log --format="%s %d" \
			>"$test.subrepo-git-log.actual"

		git log \
			--reverse \
			--patch \
			--unified=0 \
			--pretty=%n%x2A%x2A%n%s%n%n%b |
			sed -e '/^index/d' \
				>"$test.subrepo-git-commits.actual"
	fi

	popd >/dev/null

	for type in subrepo-git-commits subrepo-git-log exit-status; do
		expected="$test.$type.expected"
		actual="$test.$type.actual"
		if [ -f "$expected" ]; then
			if [[ $(diff "$expected" "$actual") ]]; then
				if [ -z "$test_failed" ]; then
					echo "🔴"
				fi
				echo
				echo Actual $type output different to expected!
				echo
				realpath --relative-to="$src" "$expected"
				realpath --relative-to="$src" "$actual"
				echo
				diff "$expected" "$actual"
				test_failed="true"
			fi
		fi
	done
	if [ -n "$test_failed" ]; then
		echo
		echo "Working directory: $workdir"
		echo
		return 1
	else
		echo "✅"
		return 0
	fi

}

if [[ "$1" ]]; then
	tests=$(realpath "$1")
else
	tests="$(realpath tests)/*.sh"
fi
total_tests=0
total_failed=0
for test in $tests; do
	if [[ ! "$1" || $(realpath "$1") == "$test" ]]; then
		((total_tests = total_tests + 1))
		run_test "$test" || ((total_failed = total_failed + 1))
	fi
done
echo "$total_tests tests, $total_failed failed"
test "$total_failed" -eq "0"