/**
 * POSIX Issue 7–style integer comparison primaries for /bin/test (mirrors
 * packages/bare-os-coreutils/src/test.js evalTest three-arg int branch).
 */
import test from 'brittle'

/** @param {string | number} a @param {string} op @param {string | number} b */
function evalIntRel(a, op, b) {
  const la = Number.parseInt(String(a), 10)
  const lb = Number.parseInt(String(b), 10)
  if (!Number.isFinite(la) || !Number.isFinite(lb)) return false
  switch (op) {
    case '-eq':
      return la === lb
    case '-ne':
      return la !== lb
    case '-lt':
      return la < lb
    case '-le':
      return la <= lb
    case '-gt':
      return la > lb
    case '-ge':
      return la >= lb
    default:
      return false
  }
}

test('posix test integer relations (-eq -ne -lt -le -gt -ge)', async (t) => {
  t.ok(evalIntRel(0, '-eq', 0))
  t.ok(evalIntRel(3, '-ne', 4))
  t.ok(evalIntRel(2, '-lt', 5))
  t.ok(evalIntRel(5, '-le', 5))
  t.ok(evalIntRel(9, '-gt', 1))
  t.ok(evalIntRel(7, '-ge', 7))
  t.absent(evalIntRel(1, '-eq', 2))
  t.absent(evalIntRel('x', '-eq', 1))
  t.absent(evalIntRel(1, '-eq', 'y'))
})