test: add the first automated tests

__test__/pages/api/send-email.test.ts

@@ -0,0 +1,70 @@
+import { createMocks } from 'node-mocks-http'
+
+import handleSendEmail from 'pages/api/send-email'
+
+jest.mock('nodemailer', () => ({
+  createTransport: () => {
+    return {
+      sendMail: jest.fn(async () => {})
+    }
+  }
+}))
+
+describe('POST /api/send-email', () => {
+  it('succeeds and send the email', async () => {
+    const { req, res } = createMocks({
+      method: 'POST',
+      body: {
+        name: 'Divlo',
+        email: 'contact@divlo.fr',
+        subject: 'Subject',
+        message: 'Hello world!'
+      }
+    })
+    await handleSendEmail(req, res)
+    expect(res._getStatusCode()).toBe(201)
+    expect(JSON.parse(res._getData())).toEqual(
+      expect.objectContaining({
+        type: 'success'
+      })
+    )
+  })
+
+  it('fails with empty values', async () => {
+    const { req, res } = createMocks({
+      method: 'POST',
+      body: {
+        name: '',
+        email: '',
+        subject: '',
+        message: ''
+      }
+    })
+    await handleSendEmail(req, res)
+    expect(res._getStatusCode()).toBe(400)
+    expect(JSON.parse(res._getData())).toEqual(
+      expect.objectContaining({
+        type: 'requiredFields'
+      })
+    )
+  })
+
+  it('fails with invalid email', async () => {
+    const { req, res } = createMocks({
+      method: 'POST',
+      body: {
+        name: 'Name',
+        email: 'random wrong email',
+        subject: 'Subject',
+        message: 'Message'
+      }
+    })
+    await handleSendEmail(req, res)
+    expect(res._getStatusCode()).toBe(400)
+    expect(JSON.parse(res._getData())).toEqual(
+      expect.objectContaining({
+        type: 'invalidEmail'
+      })
+    )
+  })
+})