Simplify the JavaScriptFixturesHelpers module

- Only storing fixtures in one place
- This place changes whether we are in CE or EE

We discovered with @winh that only fixtures located under
spec/javascripts/fixtures are used, even in EE so there's no need to
clean/create fixtures in ee/spec/javascripts/fixtures.
Signed-off-by: Rémy Coutable <remy@rymai.me>

lib/tasks/karma.rake

 unless Rails.env.production?
   namespace :karma do
     desc 'GitLab | Karma | Generate fixtures for JavaScript tests'
-    RSpec::Core::RakeTask.new(:fixtures, [:pattern]) do |t, args|
+    task fixtures: ['karma:copy_emojis_from_public_folder', 'karma:rspec_fixtures']
+
+    desc 'GitLab | Karma | Generate fixtures using RSpec'
+    RSpec::Core::RakeTask.new(:rspec_fixtures, [:pattern]) do |t, args|
       args.with_defaults(pattern: '{spec,ee/spec}/javascripts/fixtures/*.rb')
       ENV['NO_KNAPSACK'] = 'true'
       t.pattern = args[:pattern]
       t.rspec_opts = '--format documentation'
     end
 
+    desc 'GitLab | Karma | Copy emojis file'
+    task :copy_emojis_from_public_folder do
+      # Copying the emojis.json from the public folder
+      fixture_file_name = Rails.root.join('spec/javascripts/fixtures/emojis/emojis.json')
+      FileUtils.mkdir_p(File.dirname(fixture_file_name))
+      FileUtils.cp(Rails.root.join('public/-/emojis/1/emojis.json'), fixture_file_name)
+    end
+
     desc 'GitLab | Karma | Run JavaScript tests'
     task tests: ['yarn:check'] do
       sh "yarn run karma" do |ok, res|

spec/javascripts/fixtures/emojis.rb

-require 'spec_helper'
-
-describe 'Emojis (JavaScript fixtures)' do
-  include JavaScriptFixturesHelpers
-
-  before(:all) do
-    clean_frontend_fixtures('emojis/')
-  end
-
-  it 'emojis/emojis.json' do |example|
-    JavaScriptFixturesHelpers::FIXTURE_PATHS.each do |fixture_path|
-      next unless File.directory?(fixture_path)
-
-      # Copying the emojis.json from the public folder
-      fixture_file_name = File.expand_path('emojis/emojis.json', fixture_path)
-      FileUtils.mkdir_p(File.dirname(fixture_file_name))
-      FileUtils.cp(Rails.root.join('public/-/emojis/1/emojis.json'), fixture_file_name)
-    end
-  end
-end

spec/javascripts/fixtures/static_fixtures.rb

@@ -7,25 +7,17 @@ describe ApplicationController, '(Static JavaScript fixtures)', type: :controlle
     clean_frontend_fixtures('static/')
   end
 
-  JavaScriptFixturesHelpers::FIXTURE_PATHS.each do |fixture_path|
-    fixtures_path = File.expand_path(fixture_path, Rails.root)
-
-    Dir.glob(File.expand_path('**/*.haml', fixtures_path)).map do |file_path|
-      template_file_name = file_path.sub(/\A#{fixtures_path}#{File::SEPARATOR}/, '')
-
-      it "static/#{template_file_name.sub(/\.haml\z/, '.raw')}" do |example|
-        fixture_file_name = example.description
-        rendered = render_template(fixture_path, template_file_name)
-        store_frontend_fixture(rendered, fixture_file_name)
-      end
+  Dir.glob('{,ee/}spec/javascripts/fixtures/**/*.haml').map do |file_path|
+    it "static/#{file_path.sub(%r{\A(ee/)?spec/javascripts/fixtures/}, '').sub(/\.haml\z/, '.raw')}" do |example|
+      store_frontend_fixture(render_template(file_path), example.description)
     end
   end
 
   private
 
-  def render_template(fixture_path, template_file_name)
+  def render_template(template_file_name)
     controller = ApplicationController.new
-    controller.prepend_view_path(fixture_path)
-    controller.render_to_string(template: template_file_name, layout: false)
+    controller.prepend_view_path(File.dirname(template_file_name))
+    controller.render_to_string(template: File.basename(template_file_name), layout: false)
   end
 end

spec/support/helpers/javascript_fixtures_helpers.rb

@@ -5,7 +5,7 @@ module JavaScriptFixturesHelpers
   extend ActiveSupport::Concern
   include Gitlab::Popen
 
-  FIXTURE_PATHS = %w[spec/javascripts/fixtures ee/spec/javascripts/fixtures].freeze
+  extend self
 
   included do |base|
     base.around do |example|
@@ -14,32 +14,32 @@ module JavaScriptFixturesHelpers
     end
   end
 
+  def fixture_root_path
+    'spec/javascripts/fixtures'
+  end
+
   # Public: Removes all fixture files from given directory
   #
-  # directory_name - directory of the fixtures (relative to FIXTURE_PATHS)
+  # directory_name - directory of the fixtures (relative to .fixture_root_path)
   #
   def clean_frontend_fixtures(directory_name)
-    FIXTURE_PATHS.each do |fixture_path|
-      directory_name = File.expand_path(directory_name, fixture_path)
-      Dir[File.expand_path('*.html.raw', directory_name)].each do |file_name|
+    full_directory_name = File.expand_path(directory_name, fixture_root_path)
+    Dir[File.expand_path('*.html.raw', full_directory_name)].each do |file_name|
       FileUtils.rm(file_name)
     end
   end
-  end
 
   # Public: Store a response object as fixture file
   #
   # response - string or response object to store
-  # fixture_file_name - file name to store the fixture in (relative to FIXTURE_PATHS)
+  # fixture_file_name - file name to store the fixture in (relative to .fixture_root_path)
   #
   def store_frontend_fixture(response, fixture_file_name)
-    FIXTURE_PATHS.each do |fixture_path|
-      fixture_file_name = File.expand_path(fixture_file_name, fixture_path)
+    full_fixture_path = File.expand_path(fixture_file_name, fixture_root_path)
     fixture = response.respond_to?(:body) ? parse_response(response) : response
 
-      FileUtils.mkdir_p(File.dirname(fixture_file_name))
-      File.write(fixture_file_name, fixture)
-    end
+    FileUtils.mkdir_p(File.dirname(full_fixture_path))
+    File.write(full_fixture_path, fixture)
   end
 
   def remove_repository(project)