#!/usr/bin/env bash
set -euo pipefail

fail() { echo "ASSERTION FAILED: $*" >&2; return 1; }

assert_eq() {
  local expected="$1" actual="$2"; shift 2
  if [ "$expected" != "$actual" ]; then
    fail "expected='$expected' actual='$actual' $*"
  fi
}

assert_contains() {
  local haystack="$1" needle="$2"; shift 2
  if ! grep -Fq -- "$needle" <<<"$haystack"; then
    fail "did not find '$needle' in output"
  fi
}

run_cmd() {
  local out err rc
  out="$({ err=$( { "$@"; } 2>&1 1>&3 ); rc=$?; echo "$err" >&2; echo $rc >&4; } 3>&1 4>&1)"
}