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

fail() {
  printf 'ASSERT FAIL: %s\n' "$*" >&2
  exit 1
}

pass() {
  printf 'ASSERT PASS: %s\n' "$*"
}

assert_eq() {
  local expected=$1
  local actual=$2
  local message=${3:-values differ}
  [[ ${expected} == "${actual}" ]] || fail "${message} (expected='${expected}' actual='${actual}')"
}

assert_ne() {
  local left=$1
  local right=$2
  local message=${3:-values should differ}
  [[ ${left} != "${right}" ]] || fail "${message} (value='${left}')"
}

assert_contains() {
  local haystack=$1
  local needle=$2
  local message=${3:-substring not found}
  [[ ${haystack} == *"${needle}"* ]] || fail "${message} (needle='${needle}')"
}

assert_not_contains() {
  local haystack=$1
  local needle=$2
  local message=${3:-unexpected substring found}
  [[ ${haystack} != *"${needle}"* ]] || fail "${message} (needle='${needle}')"
}

assert_file_contains() {
  local file=$1
  local needle=$2
  local message=${3:-file does not contain substring}
  [[ -f ${file} ]] || fail "file not found: ${file}"
  grep -Fq -- "${needle}" "${file}" || fail "${message} (file='${file}' needle='${needle}')"
}

assert_status() {
  local expected=$1
  local actual=$2
  local message=${3:-unexpected exit status}
  [[ ${expected} == "${actual}" ]] || fail "${message} (expected=${expected} actual=${actual})"
}