courses#new 填寫表單

編輯 spec/controllers/courses_controller_spec.rb，加入另一段 Test。

你可以注意到：new 這段測試裡面，好像一次測了兩個東西？

這豈不是違反了 One assertion per test 的原則嗎？

其實這樣的寫法不能算是破壞規則，因為其實這兩行是在測一件事 @course = Course.new，只是在 RSpec 裡限於語法的關係只能拆開寫...

describe "GET new" do
  it "assign @course" do
    course = build(:course)

    get :new

    expect(assigns(:course)).to be_a_new(Course)
  end

  it "render template" do
    course = build(:course)

    get :new

    expect(response).to render_template("new")
  end
end

be_a_new 是 RSpec 針對 Controller Spec 提供的方法：https://www.relishapp.com/rspec/rspec-rails/docs/controller-specs。

$ rspec spec/controllers/courses_controller_spec.rb
....FF

Failures:

  1) CoursesController GET new assign @course
     Failure/Error: get :new

     AbstractController::ActionNotFound:
       The action 'new' could not be found for CoursesController

  2) CoursesController GET new render template
     Failure/Error: get :new

     AbstractController::ActionNotFound:
       The action 'new' could not be found for CoursesController

Finished in 0.07564 seconds (files took 1.18 seconds to load)
6 examples, 2 failures

Failed examples:

rspec ./spec/controllers/courses_controller_spec.rb:43 # CoursesController GET new assign @course
rspec ./spec/controllers/courses_controller_spec.rb:51 # CoursesController GET new render template

new action 沒有實現。

補上 action

在 app/controllers/courses_controller.rb 加入 new 這個 action

def new
  @course = Course.new
end

$ rspec spec/controllers/courses_controller_spec.rb
....FF

Failures:

  1) CoursesController GET new assign @course
     Failure/Error: get :new

     ActionController::UnknownFormat:
       CoursesController#new is missing a template for this request format and variant.

       request.formats: ["text/html"]
       request.variant: []

       NOTE! For XHR/Ajax or API requests, this action would normally respond with 204 No Content: an empty white screen. Since you're loading it in a web browser, we assume that you expected to actually render a template, not… nothing, so we're showing an error to be extra-clear. If you expect 204 No Content, carry on. That's what you'll get from an XHR or API request. Give it a shot.

  2) CoursesController GET new render template
     Failure/Error: get :new

     ActionController::UnknownFormat:
       CoursesController#new is missing a template for this request format and variant.

       request.formats: ["text/html"]
       request.variant: []

       NOTE! For XHR/Ajax or API requests, this action would normally respond with 204 No Content: an empty white screen. Since you're loading it in a web browser, we assume that you expected to actually render a template, not… nothing, so we're showing an error to be extra-clear. If you expect 204 No Content, carry on. That's what you'll get from an XHR or API request. Give it a shot.

Finished in 0.08812 seconds (files took 1.18 seconds to load)
6 examples, 2 failures

Failed examples:

rspec ./spec/controllers/courses_controller_spec.rb:43 # CoursesController GET new assign @course
rspec ./spec/controllers/courses_controller_spec.rb:51 # CoursesController GET new render template

補上 view

touch app/views/courses/new.html.erb

加入

<div class="col-md-12">
  <%= form_for @course do |f| %>
    <%= f.text_field :title %>
    <%= f.text_area :description %>
    <div class="form-actions">
       <%= f.submit "Submit", :disable_with => 'Submiting...', :class => "btn btn-primary"%>
    </div>
  <% end %>
</div>

$ rspec spec/controllers/courses_controller_spec.rb
......

Finished in 0.05946 seconds (files took 1.14 seconds to load)
6 examples, 0 failures