export function assert(value: unknown, message = "Assertion failed"): asserts value {
  if (!value) throw new Error(message);
}

export function equal(actual: unknown, expected: unknown): void {
  const canonical = (value: unknown): string | undefined =>
    JSON.stringify(
      value,
      (_, item) =>
        item !== null && typeof item === "object" && !Array.isArray(item)
          ? Object.fromEntries(Object.entries(item).sort(([a], [b]) => a < b ? -1 : a > b ? 1 : 0))
          : item,
    );
  assert(
    canonical(actual) === canonical(expected),
    `Expected:\n${Deno.inspect(expected, { depth: Infinity })}\nReceived:\n${
      Deno.inspect(actual, { depth: Infinity })
    }`,
  );
}

export function throws(fn: () => unknown, message: string): void {
  try {
    fn();
  } catch (error) {
    assert(error instanceof Error && error.message.includes(message), `Unexpected error: ${error}`);
    return;
  }
  throw new Error(`Expected an error containing ${JSON.stringify(message)}`);
}