budget/test/system/sessions_test.rb

require "application_system_test_case"

class SessionsTest < ApplicationSystemTestCase
  setup do
    @user = users(:one)
  end

  test "should create session" do
    login(@user.email)

    assert_text "Session was successfully created"
  end

  test "should destroy Session" do
    login(@user.email)

    visit root_url
    click_on "Log out", match: :first

    assert_text "Session was successfully destroyed"
  end
end