ユーザーより先に、メールが受信トレイに届くかを確かめましょう。

const submitted = new Date();
await page.getByRole('button', { name: 'Create account' }).click();
await qa.waitForLink(address, { since: submitted });

const result = await qa.checkEmail(address, { since: submitted, expectHost: 'staging.acme.dev' });
const spam = result.checks.find((c) => c.check === 'spam_risk');
// Say what to fix: each marker with its points.
expect(result.failed, JSON.stringify(spam?.markers)).not.toContain('spam_risk');
expect(result.failed).not.toContain('harmful_attachment');

from proxymail_qa import check_email, create_address, now, wait_for_link


def test_welcome_email_reaches_the_inbox(page):
    address = create_address()["address"]
    submitted = now()
    page.goto("/sign-up")
    page.get_by_label("Email").fill(address)
    page.get_by_role("button", name="Create account").click()
    wait_for_link(address, since=submitted)

    result = check_email(address, since=submitted)
    assert "spam_risk" not in result["failed"], result["checks"]
    assert "dmarc" not in result["failed"]