taguniversalmachine

taguniversalmachine

Real-Time Phoenix: ProductChannelTest - undefined function describe/2 (pg 203)

Hi,

I am getting an error I cannot figure out on my test.
I have what I think is the exact code from the book, other than I changed “use” to “import” to fix a deprecation warning:

defmodule Sneakers23Web.ProductChannelTest do

  #use Sneakers23Web.ChannelCase, async: true
  import Sneakers23Web.ChannelCase
  alias Sneakers23Web.{Endpoint, ProductChannel}
  alias Sneakers23.Inventory.CompleteProduct

  describe "notify product released" do
    test "the size selector for the product is broadcast" do
      {inventory, _data} = Test.Factory.InventoryFactory.complete_products()
      [_, product] = CompleteProduct.get_complete_products(inventory)

      topic = "product:#{id}"
      Endpoint.subscribe(topic)

      ProductChannel.notify_product_released(product)

      assert_broadcast "released", %{size_html: html}

      assert html =~ "size-container__entry"

      Enum.each(product.items, fn item ->
        assert html =~ ~s(value="#{item.id}")
      end)
    end
  end
end

The error I get is:

sneakers_23 % mix test

12:57:13.705 [info] Migrations already up

== Compilation error in file test/sneakers_23_web/product_channel_test.exs ==
** (CompileError) test/sneakers_23_web/product_channel_test.exs:8: undefined function describe/2
(stdlib 3.15.2) erl_eval.erl:685: :erl_eval.do_apply/6
(elixir 1.12.1) lib/kernel/parallel_compiler.ex:428: Kernel.ParallelCompiler.require_file/2
(elixir 1.12.1) lib/kernel/parallel_compiler.ex:321: anonymous fn/4 in Kernel.ParallelCompiler.spawn_workers/7

I can imagine why describe would not show up if I am not importing the right test module, but why is it saying I have describe/2 when I am clearly only giving it one argument? Changing import back to use doesn’t fix anything either.

Marked As Solved

sb8244

sb8244

Author of From Ruby to Elixir and Real-Time Phoenix

Ah, that’s due to the Erlang version. You are right to upgrade it if you’re following with other books.

I’m unsure of the problem you’re facing because changed the use to import in channel_case.ex but no difference is not correct. When you change from use to import there, that warning will disappear.

I’m unable to provide updated code for the book because that has to go through a process with the publisher. I’m willing to evaluate my options for providing a code-update, but I need to get their thoughts here.

What about this: you upload your warning code (not the one with :pg2 failing) to Github and I’ll update it to work with latest Erlang/Elixir without warnings. I cannot do every chapter’s code, but I can do it for the current code you’re stuck on. It is likely something you can then apply to other chapters.

Where Next?

Popular Pragmatic Bookshelf topics Top

yulkin
your book suggests to use Image.toByteData() to convert image to bytes, however I get the following error: "the getter ‘toByteData’ isn’t...
New
Mmm
Hi, build fails on: bracket-lib = “~0.8.1” when running on Mac Mini M1 Rust version 1.5.0: Compiling winit v0.22.2 error[E0308]: mi...
New
leba0495
Hello! Thanks for the great book. I was attempting the Trie (chap 17) exercises and for number 4 the solution provided for the autocorre...
New
brunogirin
When running tox for the first time, I got the following error: ERROR: InterpreterNotFound: python3.10 I realised that I was running ...
New
jonmac
The allprojects block listed on page 245 produces the following error when syncing gradle: “org.gradle.api.GradleScriptException: A prob...
New
kolossal
Hi, I need some help, I’m new to rust and was learning through your book. but I got stuck at the last stage of distribution. Whenever I t...
New
jwandekoken
Book: Programming Phoenix LiveView, page 142 (157/378), file lib/pento_web/live/product_live/form_component.ex, in the function below: d...
New
Keton
When running the program in chapter 8, “Implementing Combat”, the printout Health before attack was never printed so I assumed something ...
New
davetron5000
Hello faithful readers! If you have tried to follow along in the book, you are asked to start up the dev environment via dx/build and ar...
New
dachristenson
@mfazio23 Android Studio will not accept anything I do when trying to use the Transformations class, as described on pp. 140-141. Googl...
New

Other popular topics Top

New
PragmaticBookshelf
Machine learning can be intimidating, with its reliance on math and algorithms that most programmers don't encounter in their regular wor...
New
PragmaticBookshelf
Brace yourself for a fun challenge: build a photorealistic 3D renderer from scratch! In just a couple of weeks, build a ray tracer that r...
New
PragmaticBookshelf
Free and open source software is the default choice for the technologies that run our world, and it’s built and maintained by people like...
New
PragmaticBookshelf
Write Elixir tests that you can be proud of. Dive into Elixir’s test philosophy and gain mastery over the terminology and concepts that u...
New
ohm
Which, if any, games do you play? On what platform? I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...
New
Exadra37
Please tell us what is your preferred monitor setup for programming(not gaming) and why you have chosen it. Does your monitor have eye p...
New
AstonJ
There’s a whole world of custom keycaps out there that I didn’t know existed! Check out all of our Keycaps threads here: https://forum....
New
New
PragmaticBookshelf
Get the comprehensive, insider information you need for Rails 8 with the new edition of this award-winning classic. Sam Ruby @rubys ...
New

Sub Categories: