put in features/step_definitions/user_steps.rb

user_steps.rb

Given "I am signed in" do
  user = User.create!(:email => 'alice@example.com' :password => 'password', :password_confirmation => 'password'
  
  step 'I go to the homepage'
  step 'I follow "Sign In"'
  step %Q|I fill in "user_email" with "#{user.email}"|
  step 'I fill in "user_password" with "password"'
  step 'I press "Sign in"'
end