Add controller test for GET login
user
```ruby
# require 'rails_helper'

# RSpec.describe "", :type => :request do
#   it "displays the user's username after successful login" do
#     user = User.create!(:name => "jdoe", :password => "secret")
#     get "/login"
#     assert_select "form.login" do
#       assert_select "input[name=?]", "username"
#       assert_select "input[name=?]", "password"
#       assert_select "input[type=?]", "submit"
#     end
#   end
# end```
assistant