login_spec.rb

require 'rails_helper'

feature 'authentication' do
  let!(:user) { create(:user, password: '12345678', password_confirmation: '12345678') }

  before do
    visit root_path
    fill_in :user_email, with: user.email
    fill_in :user_password, with: '12345678'
    click_button 'Sign in'
  end

  describe 'logging' do
    it 'logs in with valid credentials' do
      expect(page).to have_content('logout')
    end
  end

  describe 'logging out' do
    it 'logs out' do
      click_link 'logout'

      expect(page).not_to have_content('logout')
    end
  end
end