Brief test: make its own event later today (#22)

ddiff --git a/test/pages.test.js b/test/pages.test.js
iindex bf2f564..ada3ecd 100644
---- a/test/pages.test.js
++++ b/test/pages.test.js
@@@ -114,10 +114,19 @@ function jsonLd(html) {
  
      await check('/brief is 401 signed out and renders sections signed in', async () => {
          assert.strictEqual((await t.get('/brief')).status, 401);
++        // "Later today" needs an event still ahead on this UTC day. The /me check's event sits 4 h ahead, which is
++        // tomorrow after 20:00 UTC, so this check makes its own: halfway to midnight (at most 4 h, at least 1 min). In
++        // the day's last two minutes it waits for midnight first.
++        let left = Date.UTC(new Date().getUTCFullYear(), new Date().getUTCMonth(), new Date().getUTCDate() + 1) - Date.now();
++        if (left < 120_000) { await new Promise((ok) => setTimeout(ok, left + 1000)); left = 86_400_000; }
++        const startsAt = new Date(Date.now() + Math.min(4 * 60 * 60_000, Math.max(60_000, Math.floor(left / 2)))).toISOString();
++        const later = await t.get('/api/v1/events', { as: alice, json: { kind: 'stream', title: 'Brief item', starts_at: startsAt, tz: 'UTC' } });
++        assert.strictEqual(later.status, 201);
          const r = await t.get('/brief', { as: alice });
          assert.strictEqual(r.status, 200);
          assert.ok(r.text.includes('id="td-brief"'));
--        assert.ok(r.text.includes('Later today'));
++        assert.ok(r.text.includes('Later today'), 'the brief has a "Later today" section');
++        assert.ok(r.text.includes('Brief item'), 'with the event still ahead today');
      });
  
      await check('/schedule: signed out 401; the plain form POSTs and redirects to /e/:id', async () => {