Add integration specs for Sessions
user
```ruby
require 'rails_helper'

RSpec.feature "Sessions", type: :feature do

  let(:user) { create(:user) }


  scenario "User signs in successfully with email and password", :js do
    # Setup
    visit root_path

    # Action
    fill_in :signin_user_email, with: user.email
    fill_in :signin_user_password, with: user.password
    click_button "Sign in"

    # Expectation
    expect(current_path).to eql(plans_path)
    expect(page).to have_text(user.firstname)
    expect(page).to have_text(user.surname)
  end

  scenario "User fails sign in with email and password", :js do
    # Setup
    visit root_path

    # Action
    fill_in :signin_user_email, with: user.email
    fill_in :signin_user_password, with: "rong-password"
    click_button "Sign in"

    # Expectation
    expect(current_path).to eql(root_path)
    expect(page).not_to have_text(user.firstname)
    expect(page).not_to have_text(user.surname)
    expect(page).to have_text("Error")
  end

end
```
assistant