Fix JS/feature test failures by configuring local chromedriver

.gitignore

@@ -60,3 +60,6 @@ nbproject
 *.iws
 .idea/
 .vagrant/
+
+# Ignore chromedriver binary (for test environment)
+/bin/chromedriver

README.md

@@ -56,8 +56,11 @@ get you up and running.
 1. [Start hacking](https://railsforzombies.org/)
 1. [Test your changes](https://www.relishapp.com/rspec/rspec-core/docs)
    ```shell
-   docker-compose exec hackweek rspec
+   docker compose run hackweek bundle exec rspec
    ```
+   Note: For running tests, use `docker compose run` instead of `docker compose exec`.
+   The tests require chromedriver for JavaScript/feature tests. Place the chromedriver
+   binary in `bin/chromedriver` if not already present.
 1. [Send pull request](https://help.github.com/articles/using-pull-requests)
 1. $UCCE$$
 

spec/rails_helper.rb

@@ -1,6 +1,29 @@
 require 'simplecov'
+
+# Configure webdrivers to not try to download anything
+# In sandboxed environments, we assume chromedriver is already available
 require 'webdrivers'
 
+# Patch Webdrivers to skip network calls
+module Webdrivers
+  class Chromedriver < Common
+    def self.update
+      # Skip update in sandboxed environment
+      nil
+    end
+
+    def self.install
+      # Skip install in sandboxed environment
+      nil
+    end
+
+    def self.remove
+      # Skip remove in sandboxed environment
+      nil
+    end
+  end
+end
+
 if ENV['TRAVIS']
   require 'coveralls'
   SimpleCov.formatter = Coveralls::SimpleCov::Formatter
@@ -37,11 +60,18 @@
 
   Capybara.register_driver :chrome_headless do |app|
     options = ::Selenium::WebDriver::Chrome::Options.new
+    options.binary = '/usr/bin/chromium-browser' # Use system chromium
     options.args << '--window-size=1920x1080'
     options.args << '--headless'
     options.args << '--no-sandbox'
     options.args << '--disable-gpu'
-    Capybara::Selenium::Driver.new(app, browser: :chrome, options: options)
+    options.args << '--disable-dev-shm-usage' # Overcome limited resource problems
+
+    # Use our local chromedriver to avoid network downloads
+    chromedriver_path = Rails.root.join('bin/chromedriver').to_s
+    service = Selenium::WebDriver::Service.chrome(path: chromedriver_path)
+
+    Capybara::Selenium::Driver.new(app, browser: :chrome, options: options, service: service)
   end
 
   Capybara.javascript_driver = :chrome_headless