Fix Ruby 2.5 CI by avoiding dependency on psych

Otherwise rdoc pulls Psych 5.x and that breaks bundler
itself.

Author: byroot

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          # - '2.5', # 2.5 is broken in ruby/setup-ruby. It ships with a very old bundler but Pysch 5.x and crash.
+          - '2.5',
           - '2.6',
           - '2.7',
           - '3.0',
@@ -30,6 +30,7 @@ jobs:
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true
+        cache-version: 2
     - name: Run tests
       run: bundle exec rake --trace
       env:

Gemfile

@@ -7,7 +7,7 @@ end
 
 group :development do
   gem 'rake', :require => false
-  gem 'rdoc'
+  gem 'rdoc' unless ENV['CI'] # Avoid dependency on psych for Ruby 2.5 compatibility
   gem 'test-unit'
   gem 'pry'
   gem 'rack', '~> 2.2'

Rakefile

@@ -1,6 +1,5 @@
 require 'bundler/setup'
 require 'rake/testtask'
-require 'rdoc/task'
 require 'bundler/gem_tasks'
 
 task :default => :test
@@ -13,13 +12,17 @@ Rake::TestTask.new('test') do |test|
   test.test_files = Dir.glob('test/test_*.rb')
 end
 
-Rake::RDocTask.new("doc") do |rdoc|
-  load 'lib/httpclient/version.rb'
-  rdoc.rdoc_dir = 'doc'
-  rdoc.title = "HTTPClient Library Document: Version #{HTTPClient::VERSION}"
-  rdoc.rdoc_files.include('README.txt')
-  rdoc.rdoc_files.include('lib/httpclient/*.rb')
-  rdoc.rdoc_files.include('lib/httpclient.rb')
+unless ENV['CI']
+  require 'rdoc/task'
+
+  Rake::RDocTask.new("doc") do |rdoc|
+    load 'lib/httpclient/version.rb'
+    rdoc.rdoc_dir = 'doc'
+    rdoc.title = "HTTPClient Library Document: Version #{HTTPClient::VERSION}"
+    rdoc.rdoc_files.include('README.txt')
+    rdoc.rdoc_files.include('lib/httpclient/*.rb')
+    rdoc.rdoc_files.include('lib/httpclient.rb')
+  end
 end
 
 task 'tags' do