webpacker: Can't find packs using Capybara/RSpec

Ruby 2.3.1 Rails 5.1.3 Webpacker 3.0.2

I’m using Webkit as my JS driver. I can find the packs while in prod and dev but cannot get my React components to render while running tests.

I have this in my rails_helper.rb and it generates the correct files. config.before(:suite) do # compile front-end Webpacker.compile end

Manifest file: { "application.js": "/assets/packs-test/application-1b884d2f94460a1a42f1.js" }

Output from save_and_open_page <script src="/assets/packs-test/application-1b884d2f94460a1a42f1.js"></script>

My manifest file looks good as well and it pointing in the right files. Do I have to serve these files up with a different process to get them to render?

About this issue

Original URL
State: closed
Created 7 years ago
Comments: 29 (18 by maintainers)

Commits related to this issue

Add capybara configuration to testing.rb (#1340) https://github.com/rails/webpacker/issues/998 — committed to rails/webpacker by smarquez1 6 years ago
upgrade webpack This update follows https://github.com/rails/webpacker/issues/998 — committed to an-ju/projectscope by an-ju 6 years ago
fix rspec ci ci is failing since it for some reason refused to generate webpack output this seems to be caused by some differences between home bundler runs rspec in ci vs in local ref: https://git... — committed to ignatiusreza/zscore by ignatiusreza 5 years ago
Add capybara configuration to testing.rb (#1340) https://github.com/rails/webpacker/issues/998 — committed to KingTiger001/Rails-web-pack-project by KingTiger001 6 years ago
Add capybara configuration to testing.rb (#1340) https://github.com/rails/webpacker/issues/998 — committed to smartech7/ruby-webpacker by smarquez1 6 years ago

Most upvoted comments

I solved this issue in Rails 5.2 rc1 by setting this variable in test.rb:

  # Configure public file server for tests with Cache-Control for performance.
  config.public_file_server.enabled = true

smarquez1 on Mar 9, 2018

Thanks, everyone for keeping this thread updated. We have added an info task to show version info, thanks to @ytbryan :

bundle exec rails webpacker:info

Will make a new release today.

gauravtiwari on Apr 29, 2018

I solved this issue in Rails 5.2 rc1 by setting this variable in test.rb:
  # Configure public file server for tests with Cache-Control for performance.
  config.public_file_server.enabled = true

this instantly fixed my issue with React components included via react-rails gem not displaying in RSpec tests (js: true) using Capybara/Selenium.

JeremyEllingham on May 22, 2019

I had the same error mentioned in https://github.com/rails/webpacker/issues/998#issuecomment-375597197 but it was because I needed to add the following to Codeship setup commands:

nvm install 8.4.0
yarn install

svpersteve on Feb 21, 2019

I have the same problem locally after deleting the public/packs-test folder.

I use

➜ gem --version
2.7.6

➜ bundle --version
Bundler version 1.16.1

➜ rails -v
Rails 5.1.5

➜ bin/webpack
/Users/holger/.rbenv/versions/2.4.3/lib/ruby/site_ruby/2.4.0/bundler/rubygems_integration.rb:458:in `block in replace_bin_path': can't find executable webpack for gem webpacker (Gem::Exception)
	from /Users/holger/.rbenv/versions/2.4.3/lib/ruby/site_ruby/2.4.0/bundler/rubygems_integration.rb:489:in `block in replace_bin_path'
	from bin/webpack:17:in `<main>'

Error in test

    # Webpacker::Manifest::MissingEntryError:
     #   Webpacker can't find app.js in /Users/holger/projects/clients/edeka/edk-old/public/packs-test/manifest.json. Possible causes:
     #   1. You want to set webpacker.yml value of compile to true for your environment
     #      unless you are using the `webpack -w` or the webpack-dev-server.
     #   2. webpack has not yet re-run to reflect updates.
     #   3. You have misconfigured Webpacker's config/webpacker.yml file.
     #   4. Your webpack configuration is not creating a manifest.
     #   Your manifest contains:
     #   {
     #   }

I added config.public_file_server.enabled = true in config/environments/test.rb but it did not change a thing. How could I proceed here?

edit Also happens with Rails Version 5.2.0.rc1 from branch 5-2-stable.

edit 2 Perhaps this is old news, but if I downgrade webpacker to 3.2.2 it works again. It did not work with version 3.3.1 or 3.3.0.

edit 3 OR RTFM => https://github.com/rails/webpacker/blob/master/CHANGELOG.md#breaking-changes bundle exec rails webpacker:binstubs

Now everything works for me again. Sorry again if this was old news for you.

5minpause on Mar 23, 2018