#!/bin/bash
set -e

pkg_name="hello"
pkg_ver=$(apt-cache showsrc "$pkg_name" | sed -n '/^Version:/{s/[^:]*:\s\(.*\)/\1/;p}')
src_ver=$(echo "$pkg_ver" | sed 's/-[^-]*$//')
build_dir="/var/cache/apt-build/build"
ch_file="$build_dir/$pkg_name-$src_ver/debian/changelog"
curr_ver=$(dpkg-parsechangelog -l "$ch_file" -S Version)
n=$(echo "$curr_ver" | grep -o -P '(?<=\+aptbuild)\d+$' || echo 0)

apt-build install "$pkg_name"

dpkg-query -W "$pkg_name" | grep -q -x "$pkg_name"$'\t'"$pkg_ver+aptbuild$((n + 1))"
LANG=C hello | grep -q -x "Hello, world!"