Make it compatible with JRuby 9000

.travis.yml

@@ -4,6 +4,7 @@ rvm:
   - 2.2.0
   - 2.1.0
   - 2.0.0
+  - jruby-head
 addons:
   code_climate:
     repo_token:

asciidoctor-doctest.gemspec

@@ -1,5 +1,5 @@
 # coding: utf-8
-require_relative 'lib/asciidoctor/doctest/version'
+require File.expand_path('lib/asciidoctor/doctest/version', __dir__)
 
 Gem::Specification.new do |s|
   s.name          = 'asciidoctor-doctest'

features/support/env.rb

@@ -14,6 +14,9 @@
   FileUtils.mkdir_p TEMP_DIR
   # overwrite Aruba's default temp directory location
   @dirs = [TEMP_DIR]
+
+  # Increase timeout for JRuby, that is very slooow...
+  @aruba_timeout_seconds = 50
 end
 
 After do

lib/asciidoctor/doctest/asciidoc_renderer.rb

@@ -2,6 +2,8 @@
 require 'active_support/core_ext/object/blank'
 require 'asciidoctor'
 require 'asciidoctor/converter/template'
+require 'asciidoctor/doctest/core_ext'
+require 'delegate'
 
 module Asciidoctor
   module DocTest

lib/asciidoctor/doctest/core_ext.rb

@@ -47,3 +47,18 @@ def concat(obj, separator = nil)
     end
   end
 end
+
+
+# Workarounds for JRuby.
+if RUBY_ENGINE == 'jruby'
+  require 'delegate'
+
+  # @private
+  class SimpleDelegator
+
+    # https://github.com/jruby/jruby/issues/2412
+    def warn(*msg)
+      Kernel.warn(*msg)
+    end
+  end
+end