feat: +checks flake output

test/package/default.nix

@@ -0,0 +1 @@
+{ system, inputs, self, pkgs }:   (import ./migrator { inherit system inputs self pkgs; })

test/package/migrator/default.nix

@@ -0,0 +1,44 @@
+{ inputs, self, pkgs, system, ... }: let 
+  lib = inputs.nixpkgs.lib;
+
+  # turn anything under ./test into a derivation that exposes $out/run.sh
+  mkTestDrv = name: type:
+    if type == "directory" then
+      pkgs.runCommand "test-${name}" {} ''
+        if ! [ -f ${./test + "/${name}" + /run.sh} ]; then
+          echo no run.sh in test/${name}
+	  exit 1
+        fi
+
+        mkdir -p "$out"
+        cp -r ${./test + "/${name}"}/* "$out/"
+        chmod +x "$out/run.sh"
+      ''
+    else if lib.hasSuffix ".sh" name then
+      pkgs.runCommand "test-${lib.removeSuffix ".sh" name}" {} ''
+        mkdir -p "$out"
+        install -Dm755 ${./test + "/${name}"} "$out/run.sh"
+      ''
+    else
+      null;
+
+  testDir = builtins.readDir ./test;
+
+  # attrset: testName -> drv with run.sh
+  testDrvs =
+    lib.mapAttrs' (n: v:
+      lib.nameValuePair (lib.removeSuffix ".sh" n) v
+    ) (lib.filterAttrs (_: v: v != null)
+      (lib.mapAttrs (n: t: mkTestDrv n t) testDir));
+
+  migrator = self.packages.${system}.migrator;
+  mkPgTest = testName: testDrv: pkgs.runCommand "migrator-test-${testName}"
+  {
+    nativeBuildInputs = [ pkgs.coreutils pkgs.gnugrep pkgs.gnused ];
+    buildInputs = [ migrator pkgs.postgresql ];
+  } ''
+    ${builtins.readFile self.legacyPackages.${system}.helpers.posix-shell.log}
+    test=${testDrv}
+    ${builtins.readFile ./lauch.sh}
+  '';
+in builtins.trace testDir (lib.mapAttrs (name: drv: mkPgTest name drv) testDrvs)

test/package/migrator/lauch.sh

@@ -0,0 +1,68 @@
+#!/bin/dash
+
+# $out  - nix derivation output
+# $test - test and assertion file
+
+test_derivation="$(basename "$test")"
+test_name="${test_derivation#*-*-}"
+
+set -eu
+
+root_dir="$(dirname $0)"
+
+HECTIC_LOG=
+
+# save path to pg_ctl in case $PATH will change
+PG_CTL="$(command -v pg_ctl)"
+cleanup() {
+  "$PG_CTL" -D "$data" -m fast -w stop
+}
+
+log info 'start test pipeline'
+
+# temp dirs
+wd="$PWD"
+data="$wd/data"
+sockdir="$wd/sock"
+db="testdb"
+mkdir -p "$data" "$sockdir"
+
+# initdb
+initdb -D "$data" --no-locale -E UTF8 >/dev/null
+
+# trust local auth for the test
+{
+  echo "unix_socket_directories = '$sockdir'"
+  echo "listen_addresses = ''"
+} >> "$data/postgresql.conf"
+sed -i "1ilocal all all trust" "$data/pg_hba.conf"
+
+# start cluster
+pg_ctl -D "$data" -o "-F" -w start
+trap cleanup EXIT
+
+user="$(id -un)"
+
+# bootstrap DB
+createdb -h "$sockdir" -U "$user" "$db"
+
+psql -h "$sockdir" -d testdb -v ON_ERROR_STOP=1 -c 'select 1;' >/dev/null
+
+export PGHOST="$sockdir"
+export PGPORT=5432
+export PGUSER="$user"
+export PGDATABASE="$db"
+
+DATABASE_URL="postgresql://${PGUSER}@/${PGDATABASE}?host=${PGHOST}&port=${PGPORT}"
+export DATABASE_URL
+
+log info "run test ${WHITE}${test_name}${NC}"
+
+# run test
+. "${test}/run.sh"
+
+log info "finish test pipeline"
+
+# success marker for Nix
+# shellcheck disable=SC2154
+mkdir -p "$out"

test/package/migrator/test/mising-psql.sh

@@ -0,0 +1,21 @@
+# remove psql from $PATH
+dir=$(dirname -- "$(command -v psql)")
+PATH=$(printf '%s' "$PATH" | awk -v RS=: -v ORS=: -v d="$dir" '$0!=d{print}')
+PATH=${PATH%:}
+# clear lookup cache
+hash -r 2>/dev/null || true
+
+# temporary disable break on errors, coz in this test we check error-handling scenario
+set +e
+# try to run migrator without installed psql
+migrator 2>/dev/null
+migrator_error_code=$?
+set -e
+
+log debug "migrator error code: $migrator_error_code"
+
+if [ "$migrator_error_code" -eq 127 ]; then
+  log notice "test passed"
+else
+  log error "test failed"
+fi