>
>
> The home page is controlled by static_pages_controller.rb
> However the part of the home page concerning microposts creation and 
> deletion is controlled by the microposts controller.
> Below is an extract of microposts_controller.rb
>
> class MicropostsController < ApplicationController
>   before_action :logged_in_user, only: [:create, :destroy]
>   before_action :correct_user,   only: :destroy
>
>   def create
>     @micropost = current_user.microposts.build(micropost_params)
>     if @micropost.save
>       flash[:success] = "Micropost created!"
>       redirect_to root_url
>     else
>       @feed_items = []
>       render 'static_pages/home'
>     end
>   end
>
> Line 12 is exactly render 'static_pages/home'
> app/view/static_pages/home.html.erb is all below:
>
> <% if logged_in? %>
>   <% if current_user.gamer? %>
>     <%= render 'static_pages/gamers_home' %>
>   <% else %>
>     <%= render 'static_pages/non_gamers_home' %>
>   <% end %>
> <% else %>
>   <%= render 'static_pages/non_logged_in_home' %>
> <% end %>
>
>
The lines of the test that are mentioned by the test itself (lines 15 and 
16) are:

    assert_no_difference 'Micropost.count' do
      post microposts_path, params: { micropost: { content: "" } }
    end

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