// What berry's tests share, wherever they are: an extension's tests may import it too, as a bare specifier.

/** Wait for `check` to hold, failing after `timeout` milliseconds. */
export async function until(
  check: () => boolean | Promise<boolean>,
  { timeout = 5_000, message = "timed out waiting" } = {},
): Promise<void> {
  const deadline = Date.now() + timeout;
  while (!(await check())) {
    if (Date.now() > deadline) throw new Error(message);
    await new Promise((resolve) => setTimeout(resolve, 5));
  }
}

/** A temporary directory, by its real path, gone once its `await using` scope ends. */
export async function tempDir(
  options: Deno.MakeTempOptions = {},
): Promise<{ path: string } & AsyncDisposable> {
  const path = await Deno.realPath(await Deno.makeTempDir({ prefix: "berry-test-", ...options }));
  return {
    path,
    [Symbol.asyncDispose]: () => Deno.remove(path, { recursive: true }).catch(() => {}),
  };
}

/** Whether `command` is on this machine's PATH, for skipping tests that need it. */
export function onPath(command: string): boolean {
  return (Deno.env.get("PATH") ?? "").split(":").some((dir) => {
    try {
      return Deno.statSync(`${dir}/${command}`).isFile;
    } catch {
      return false;
    }
  });
}

/** A valid 1×1 PNG, as base64. */
export const PNG =
  "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR4nGP4z/D/PwAG/gL+DHWJ3gAAAABJRU5ErkJggg==";