Add login & user tests

spec/features/login_spec.rb

@@ -0,0 +1,34 @@
+require 'rails_helper'
+
+RSpec.feature "Login", type: :feature do
+  context "visiting the login page" do
+    let!(:user) { create(:user) }
+
+    it "should log in the user with the correct credentials" do
+      visit '/'
+      fill_in "Email address", with: user.email_address
+      fill_in "Password", with: user.password
+      click_button "Sign in"
+
+      expect(page).not_to have_content("Login")
+    end
+
+    it "should fail to log in the user with an incorrect email address" do
+      visit '/'
+      fill_in "Email address", with: Faker::Internet.unique.email
+      fill_in "Password", with: user.password
+      click_button "Sign in"
+
+      expect(page).to have_content("Login")
+    end
+
+    it "should fail to log in the user with an incorrect password" do
+      visit '/'
+      fill_in "Email address", with: user.email_address
+      fill_in "Password", with: Faker::Internet.unique.password
+      click_button "Sign in"
+
+      expect(page).to have_content("Login")
+    end
+  end
+end