Add automated test cases for login feature

test/pages/login.page.js

@@ -0,0 +1,15 @@
+class LoginPage {
+
+  get username () { return $('#email') }
+  get password () { return $('#password') }
+  get enterBtn () { return $('button=Entrar') }
+
+  async fillSubmitForm (user, pass) {
+    await this.username.setValue(user)
+    await this.password.setValue(pass)
+    await this.enterBtn.click()
+  }
+
+}
+
+export default new LoginPage()

test/specs/login.e2e.js

@@ -1,14 +1,20 @@
-describe('My Login application', () => {
-  it('should login with valid credentials', async () => {
-    await browser.url(`https://the-internet.herokuapp.com/login`)
+import LoginPage from '../pages/login.page.js'
 
-    await $('#username').setValue('tomsmith')
-    await $('#password').setValue('SuperSecretPassword!')
-    await $('button[type="submit"]').click()
+describe('Application login', () => {
+  beforeEach(async () => {
+    await browser.url('/')
+  })
+
+  it('signs in with valid credentials', async () => {
+    await LoginPage.fillSubmitForm('[email protected]', 'generic')
 
-    await expect($('#flash')).toBeExisting()
-    await expect($('#flash')).toHaveTextContaining(
-      'You logged into a secure area!')
+    await expect(browser).toHaveUrlContaining('home')
+    await expect($('h1')).toHaveTextContaining('Serverest Store')
   })
-})
 
+  it('shows error message with wrong password', async () => {
+    await LoginPage.fillSubmitForm('[email protected]', 'wrong')
+
+    await expect($('.alert')).toHaveTextContaining('Email e/ou senha inválidos')
+  })
+})