Added test harness

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  functional-test:
+    runs-on: ubuntu-22.04
+    container:
+      image: heroku/heroku:${{ matrix.stack_number }}-build
+    strategy:
+      matrix:
+        stack_number: ["20", "22"]
+    env:
+      STACK: heroku-${{ matrix.stack_number }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Functional tests on heroku:${{ matrix.stack_number }}-build
+        run: test/run

Makefile

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+test: heroku-22-build heroku-20-build
+
+heroku-22-build:
+	@echo "Running tests in docker (heroku-22-build)..."
+	@docker run -v $(shell pwd):/buildpack:ro --rm -it -e "STACK=heroku-22" heroku/heroku:22-build bash -c 'cp -r /buildpack /buildpack_test; cd /buildpack_test/; test/run;'
+	@echo ""
+
+heroku-20-build:
+	@echo "Running tests in docker (heroku-20-build)..."
+	@docker run -v $(shell pwd):/buildpack:ro --rm -it -e "STACK=heroku-20" heroku/heroku:20-build bash -c 'cp -r /buildpack /buildpack_test; cd /buildpack_test/; test/run;'
+	@echo ""

test/fixtures/custom-package-url-heroku-20/Aptfile

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+https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.focal_amd64.deb

test/fixtures/custom-package-url-heroku-22/Aptfile

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+https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6.1-2/wkhtmltox_0.12.6.1-2.jammy_amd64.deb

test/fixtures/custom-repository-heroku-20/Aptfile

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+:repo:deb http://us.archive.ubuntu.com/ubuntu/ focal multiverse
+fasttracker2

test/fixtures/custom-repository-heroku-22/Aptfile

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+:repo:deb http://us.archive.ubuntu.com/ubuntu/ jammy multiverse
+fasttracker2

test/fixtures/package-names/Aptfile

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+# single package
+xmlsec1
+
+# globbed package
+mysql-client-*

test/run

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+#!/usr/bin/env bash
+
+testCompilePackageNames() {
+  compile "package-names"
+  assertCaptured "Updating apt caches"
+  assertCaptured "Fetching .debs for xmlsec1"
+  assertCaptured "Fetching .debs for mysql-client-*"
+  assertCaptured "Installing xmlsec1"
+  assertCaptured "Installing mysql-client"
+  assertCaptured "Installing mysql-client-core"
+  assertCaptured "Writing profile script"
+  assertCaptured "Rewrite package-config files"
+}
+
+testReportPackageNames() {
+  report "package-names"
+  assertCaptured "packages: \"mysql-client-*,xmlsec1\""
+  assertNotCaptured "custom_packages"
+  assertNotCaptured "custom_repositories"
+  assertCapturedSuccess
+}
+
+testCompileCustomPackageUrl() {
+  declare -A download_urls=(
+    [heroku-20]="https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.focal_amd64.deb"
+    [heroku-22]="https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6.1-2/wkhtmltox_0.12.6.1-2.jammy_amd64.deb"
+  )
+  compile "custom-package-url-$STACK"
+  assertCaptured "Updating apt caches"
+  assertCaptured "Fetching ${download_urls[$STACK]}"
+  assertCaptured "Installing wkhtmltox"
+  assertCaptured "Writing profile script"
+  assertCaptured "Rewrite package-config files"
+}
+
+testReportCustomPackageUrl() {
+  declare -A download_urls=(
+    [heroku-20]="https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.focal_amd64.deb"
+    [heroku-22]="https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6.1-2/wkhtmltox_0.12.6.1-2.jammy_amd64.deb"
+  )
+  report "custom-package-url-$STACK"
+  assertNotCaptured "^packages"
+  assertCaptured "custom_packages: \"${download_urls[$STACK]}\""
+  assertNotCaptured "custom_repositories"
+}
+
+testCompileCustomRepository() {
+  declare -A ubuntu_release_names=(
+    [heroku-20]="focal"
+    [heroku-22]="jammy"
+  )
+  compile "custom-repository-$STACK"
+  assertCaptured "Adding custom repositories"
+  assertCaptured "Updating apt caches"
+  assertCaptured "http://us.archive.ubuntu.com/ubuntu ${ubuntu_release_names[$STACK]}/multiverse amd64 Packages"
+  assertCaptured "Fetching .debs for fasttracker2"
+  assertCaptured "Installing fasttracker2"
+  assertCaptured "Writing profile script"
+  assertCaptured "Rewrite package-config files"
+}
+
+testReportCustomRepository() {
+  declare -A ubuntu_release_names=(
+      [heroku-20]="focal"
+      [heroku-22]="jammy"
+    )
+  report "custom-repository-$STACK"
+  assertCaptured "packages: \"fasttracker2\""
+  assertNotCaptured "custom_packages"
+  assertCaptured "custom_repositories: \"deb http://us.archive.ubuntu.com/ubuntu/ ${ubuntu_release_names[$STACK]} multiverse\""
+}
+
+pushd "$(dirname 0)" >/dev/null || exit 1
+popd >/dev/null || exit 1
+
+source "$(pwd)"/test/utils
+
+compile() {
+  default_process_types_cleanup
+  bp_dir=$(mktmpdir)
+  compile_dir=$(mktmpdir)
+  cp -a "$(pwd)"/* "${bp_dir}"
+  cp -a "${bp_dir}"/test/fixtures/"$1"/. "${compile_dir}"
+  capture "${bp_dir}"/bin/compile "${compile_dir}" "${2:-$(mktmpdir)}" "$3"
+}
+
+report() {
+  default_process_types_cleanup
+  compile_dir=${1:-$(mktmpdir)}
+  cache_dir=${2:-$(mktmpdir)}
+  env_dir=${3:-$(mktmpdir)}
+  bp_dir=$(mktmpdir)
+  cp -a "$(pwd)"/* "${bp_dir}"
+  cp -a "${bp_dir}"/test/fixtures/"$1"/. "${compile_dir}"
+  capture "${bp_dir}"/bin/report "${compile_dir}" "${cache_dir}" "${env_dir}"
+}
+
+mktmpdir() {
+  dir=$(mktemp -t testXXXXX)
+  rm -rf "$dir"
+  mkdir "$dir"
+  echo "$dir"
+}
+
+default_process_types_cleanup() {
+  file="/tmp/default_process_types"
+  if [ -f "$file" ]; then
+    rm "$file"
+  fi
+}
+
+source "$(pwd)"/test/shunit2