Enrolment cucumber-like rspec feature spec

## enrolment_cuke_spec.rb
feature 'Enrolment' do
  scenario 'Enrolling in a course' do
    given_there_is_a_course
    and_i_am_logged_in_as_a_learner
    when_i_enrol_on_a_course
    then_the_course_should_appear_in_my_courses
  end

  def given_there_is_a_course
    @course = FactoryGirl.create(:course)
  end

  def and_i_am_logged_in_as_a_learner
    @learner = FactoryGirl.create(:learner)
    login_as @learner
  end

  def when_i_enrol_on_a_course
    visit course_path(@course)
    find('.join').click
    expect(page).to have_content('Thanks for joining!')
  end

  def then_the_course_should_appear_in_my_courses
    visit '/'
    expect(page).to have_main_header('My Courses')
    expect(page).to have_content(@course.full_title)
  end
end