import test from 'node:test';
import assert from 'node:assert/strict';

test('waitForRouterReadyInBackground returns immediately and logs failures', async () => {
  const module = await import('../src/utils/routerReadiness.mjs').catch(() => null);

  assert.ok(module?.waitForRouterReadyInBackground);

  const error = new Error('router blocked');
  let warned;
  const readyPromise = Promise.reject(error);
  const logger = {
    warn: (message, cause) => {
      warned = { message, cause };
    },
  };

  const result = module.waitForRouterReadyInBackground(
    { isReady: () => readyPromise },
    logger,
  );

  assert.equal(result, undefined);
  await Promise.resolve();
  assert.deepEqual(warned, {
    message: 'Router did not become ready after fallback mount:',
    cause: error,
  });
});