lobster/test/read_line.test.ts

import test from 'node:test';
import assert from 'node:assert/strict';
import { PassThrough } from 'node:stream';

import { readLineFromStream } from '../src/read_line.js';

test('readLineFromStream resolves on newline', async () => {
  const input = new PassThrough();
  const promise = readLineFromStream(input);
  input.write('yes\n');
  input.end();

  const value = await promise;
  assert.equal(value, 'yes');
});

test('readLineFromStream resolves on end without newline', async () => {
  const input = new PassThrough();
  const promise = readLineFromStream(input);
  input.write('partial');
  input.end();

  const value = await promise;
  assert.equal(value, 'partial');
});

test('readLineFromStream times out when no input arrives', async () => {
  const input = new PassThrough();
  await assert.rejects(() => readLineFromStream(input, { timeoutMs: 5 }), /Timed out waiting for input/);
});