Ruby on Rails

In my application I'm using devise for authentication and rspec, capybara for testing. Here are my files

new_student_spec.rb

require 'rails_helper'

require_relative '../support/new_student_form_spec'

require_relative '../support/login_form_spec'

feature 'New Student', type: :feature do

  let(:login_form) { LoginForm.new }

  let(:new_student) { NewStudentForm.new }

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

  background do

    login_form.visit_login_form.fill_form_as(user)

  end

  scenario 'fill new student details' do

    new_student.visit_dashboard_page

  end

end

new_student_form_spec.rb

class NewStudentForm

  include Capybara::DSL

  def visit_dashboard_page

    visit('/dashboard')

    self

  end

end

login_form_spec.rb

class LoginForm

  include Capybara::DSL

  def visit_login_form

    visit('/users/sign_in')

    self

  end

  def fill_form_as(user)

    fill_in('Email', with: user.email)

    fill_in('Password', with: user.password)

    click_on('Submit')

    self

  end

end

Factory (users.rb)

FactoryGirl.define do

  factory :user do

    transient do

      skip_confirmation true

    end

    sequence(:email) { |n| "email#{n}@example.tld" }

    password 'sceretsceret'

    password_confirmation 'sceretsceret'

    before(:create) do |user, evaluator|

      user.skip_confirmation! if evaluator.skip_confirmation

    end

  end

end

Whenever I run 'bin/rspec' on above test it passes true only for one time. If I tried to run it one more time it generate following error 

1) New Student fill new student details
   Failure/Error: let(:user) { FactoryGirl.create(:user) }
   
   ActiveRecord::RecordInvalid:
     Validation failed: Email has already been taken
   # ./spec/features/new_students_spec.rb:9:in `block (2 levels) in <top (required)>'
   # ./spec/features/new_students_spec.rb:12:in `block (2 levels) in <top (required)>'

   # -e:1:in `<main>'

Where I'm going wrong?

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Cheers!

Deepak Kumar Sharma
Guru Nanak Dev Engineering College
India!

Blog: http://deekysharma.wordpress.com