How I would like to test

how_i_would_like_to_test.rb

test "writing blog posts" do
  testing {User.new}
 
  helpers do
    def write_post
      subject.posts.new(title: …)
    end
  end
 
  # describing certain expected behaviours that…
  traits do
    trait "can write posts" do
      must_change(Blog.count, 1) {write_post}
    end
 
    trait "cannot write posts" do
      wont_change(Blog.count) {write_post}
    end
 
    trait "can publish posts" do
      post = write_post
      user.publish!(post)
      post.reload.public?.must_equal true
    end
 
    trait "cannot publish posts" do
      post = subject.posts.new(title: …)
      user.publish!(post)
      post.reload.public?.must_equal
    end
  end
 
  # … under specific circumstances…
  when "the user is an author" do
    before do
      subject.add_role(:author)
    end
 
    # … are applied
    it "can write posts"
    it "cannot publish posts"
  end
 
  when "the user is an editor" do
    before do
      subject.add_role(:editor)
    end
 
    it "cannot write posts"
    it "can publish posts"
  end
 
  when "the user is an editor and an author" do
    before do
      subject.add_role(:editor)
      subject.add_role(:author)
    end
    
    it "can write posts"
    it "can publish posts"
  end
end