Vitest + plop.email

# Install Vitest
npm install -D vitest

# Add to package.json
{
  "scripts": {
    "test": "vitest",
    "test:run": "vitest run"
  }
}

# Create vitest.config.ts
import { defineConfig } from 'vitest/config';
export default defineConfig({
  test: {
    environment: 'node',
  },
});

import { describe, it, expect } from 'vitest';
import { sendWelcomeEmail } from '../src/email';

describe('Email Service', () => {
  it('sends welcome email with correct content', async () => {
    const testEmail = `vitest+${Date.now()}@in.plop.email`;

    // Send email from your app
    await sendWelcomeEmail({
      to: testEmail,
      name: 'Test User',
    });

    // Fetch from plop
    const response = await fetch(
      `https://api.plop.email/v1/messages/latest?to=${testEmail}`,
      { headers: { Authorization: `Bearer ${process.env.PLOP_API_KEY}` } }
    );
    const email = await response.json();

    // Assert
    expect(email.subject).toBe('Welcome to Our App!');
    expect(email.htmlContent).toContain('Test User');
  });
});

// test/helpers/plop.ts
export async function fetchEmail(to: string, options?: {
  timeout?: number;
  subject?: RegExp;
}) {
  const { timeout = 10000, subject } = options ?? {};
  const startTime = Date.now();

  while (Date.now() - startTime < timeout) {
    const response = await fetch(
      `https://api.plop.email/v1/messages/latest?to=${to}`,
      { headers: { Authorization: `Bearer ${process.env.PLOP_API_KEY}` } }
    );
    const email = await response.json();

    if (!email.error) {
      if (subject && !subject.test(email.subject)) {
        await new Promise(r => setTimeout(r, 1000));
        continue;
      }
      return email;
    }
    await new Promise(r => setTimeout(r, 1000));
  }
  throw new Error(`Timeout waiting for email to ${to}`);
}

// Usage in tests
import { fetchEmail } from './helpers/plop';

it('receives password reset email', async () => {
  const testEmail = `reset+${Date.now()}@in.plop.email`;
  await requestPasswordReset(testEmail);

  const email = await fetchEmail(testEmail, {
    subject: /reset/i,
    timeout: 15000,
  });

  expect(email.htmlContent).toContain('Reset your password');
});