Functional Programming: A PragPub Anthology

Controlling Setup Repetition with Story Pipes

We can eliminate this code in TrueStory with story pipes, like this:

    ...
# this example is simplified for clarity

def configure_web_app(c, ...) do
  c
  |> Map.put :conn, set_up_test_conn(...)
end

def logged_in(c, user) do
  c
  |> Map.put :session, log_in(new_user, c.conn)
end

  def get_root(c) do
    c
    |> Map.put :response, get_root(c.conn)
  end

  story "getting /", c
    |> configure_web_app
    |> get_root,
  verify do
    assert c.conn.response == :redirect
    # more assertions about an unauthorized get
  end

  story "getting /, logged in", c
    |> configure_web_app
    |> logged_in(create_user)
    |> get_root,
  verify do
 assert c.conn.response ...