. ./test-lib.sh

if ! test_have_prereq PERL; then
        say 'skipping --patch tests, perl not available'
        test_done
fi

set_state () {
        echo "$3" > "$1" &&
        git add "$1" &&
        echo "$2" > "$1"
}

save_state () {
        noslash="$(echo "$1" | tr / _)" &&
        cat "$1" > _worktree_"$noslash" &&
        git show :"$1" > _index_"$noslash"
}

set_and_save_state () {
        set_state "$@" &&
        save_state "$1"
}

verify_state () {
        test "$(cat "$1")" = "$2" &&
        test "$(git show :"$1")" = "$3"
}

verify_saved_state () {
        noslash="$(echo "$1" | tr / _)" &&
        verify_state "$1" "$(cat _worktree_"$noslash")" "$(cat _index_"$noslash")"
}

save_head () {
        git rev-parse HEAD > _head
}

verify_saved_head () {
        test "$(cat _head)" = "$(git rev-parse HEAD)"
}