fix build

Author: seuros

Rakefile

@@ -8,24 +8,18 @@ RSpec::Core::RakeTask.new(:spec) do |task|
   task.pattern = 'spec/closure_tree/*_spec.rb'
 end
 
-task default: [:spec, :test]
+task default: %i[spec test]
 
 namespace :spec do
   desc 'Run all spec variants'
   task :all do
     rake = 'bin/rake'
-    fail unless system("#{rake} spec:generators")
 
-    [['', ''], ['db_prefix_', ''], ['', '_db_suffix'], ['abc_', '_123']].each do |prefix, suffix|
+    [['', ''], ['db_prefix_', ''], ['', '_db_suffix'], %w[abc_ _123]].each do |prefix, suffix|
       env = "DB_PREFIX=#{prefix} DB_SUFFIX=#{suffix}"
-      fail unless system("#{rake} spec #{env}")
+      raise unless system("#{rake} spec #{env}")
     end
   end
-
-  desc 'Run generator specs'
-  RSpec::Core::RakeTask.new(:generators) do |task|
-    task.pattern = 'spec/generators/*_spec.rb'
-  end
 end
 
 Rake::TestTask.new do |t|
@@ -35,13 +29,14 @@ Rake::TestTask.new do |t|
   t.verbose = true
 end
 
-require 'github_changelog_generator/task'
-GitHubChangelogGenerator::RakeTask.new :changelog do |config|
-  config.user = 'ClosureTree'
-  config.project = 'closure_tree'
-  config.issues = false
-  config.future_release = '5.2.0'
-  config.since_tag = 'v7.4.0'
+if RUBY_ENGINE == 'ruby'
+  require 'github_changelog_generator/task'
+  GitHubChangelogGenerator::RakeTask.new :changelog do |config|
+    config.user = 'ClosureTree'
+    config.project = 'closure_tree'
+    config.issues = false
+    config.future_release = '5.2.0'
+    config.since_tag = 'v7.4.0'
+  end
 end
-
-task :default => "spec:all"
+task default: 'spec:all'