Fix Rubocop Rake/Desc

tasks/jenkins.rake

@@ -1,28 +1,5 @@
-require 'English'
-
-begin
-  require "ci/reporter/rake/test_unit"
-  namespace :jenkins do
-    task :unit => ["jenkins:setup:test_unit", 'rake:test']
-
-    namespace :setup do
-      task :pre_ci do
-        ENV["CI_REPORTS"] = 'jenkins/reports/unit/'
-        gem 'ci_reporter'
-      end
-      task :minitest  => [:pre_ci, "ci:setup:minitest"]
-      task :test_unit => [:pre_ci, "ci:setup:testunit"]
-    end
-
-    task :rubocop do
-      system("bundle exec rubocop \
-        --require rubocop/formatter/checkstyle_formatter \
-        --format progress \
-        --format RuboCop::Formatter::CheckstyleFormatter \
-        --no-color --out rubocop.xml")
-      exit($CHILD_STATUS.exitstatus)
-    end
-  end
-rescue LoadError
-  # ci/reporter/rake/rspec not present, skipping this definition
+require "ci/reporter/rake/test_unit"
+namespace :jenkins do
+  desc 'Sets up CI environment for testing and run tests'
+  task :unit => ['ci:setup:testunit', 'rake:test']
 end