fix to run tests

Author: sonots

Gemfile

@@ -1,6 +1,7 @@
 source 'https://rubygems.org/'
 
 gemspec
+gem 'embulk'
 gem 'embulk-parser-none'
 gem 'embulk-parser-jsonl'
 gem 'pry-nav'

README.md

@@ -455,23 +455,34 @@ $ curl -o embulk.jar --create-dirs -L "http://dl.embulk.org/embulk-latest.jar"
 $ chmod a+x embulk.jar
 ```
 
-Investigate JRUBY\_VERSION included in the embulk.jar:
+Investigate JRUBY\_VERSION and Bundler::VERSION included in the embulk.jar:
 
 ```
 $ echo JRUBY_VERSION | ./embulk.jar irb
 2019-08-10 00:59:11.866 +0900: Embulk v0.9.17
 Switch to inspect mode.
 JRUBY_VERSION
 "X.X.X.X"
+
+$ echo "require 'bundler'; Bundler::VERSION" | ./embulk.jar irb
+2019-08-10 01:59:10.460 +0900: Embulk v0.9.17
+Switch to inspect mode.
+require 'bundler'; Bundler::VERSION
+"Y.Y.Y"
 ```
 
-Install the same version of jruby (change X.X.X.X to the version shown above):
+Install the same version of jruby (change X.X.X.X to the version shown above) and bundler:
 
 ```
 $ rbenv install jruby-X.X.X.X
 $ rbenv local jruby-X.X.X.X
-$ gem install bundler
-$ bundle install
+$ gem install bundler -v Y.Y.Y
+```
+
+Install dependencies (NOTE: Use bundler included in the embulk.jar, otherwise, `gem 'embulk'` is not found):
+
+```
+$ ./embulk.jar bundle install --path vendor/bundle
 ```
 
 Run tests with `env RUBYOPT="-r ./embulk.jar`:

test/test_example.rb

@@ -1,4 +1,5 @@
 require_relative './helper'
+require 'bundler'
 
 # 1. Prepare example/your-project-000.json
 # 2. embulk bundle
@@ -9,8 +10,10 @@
 else
   class TestExample < Test::Unit::TestCase
     def embulk_path
-      if File.exist?("#{ENV['PATH']}/.embulk/bin/embulk")
-        "#{ENV['PATH']}/.embulk/bin/embulk"
+      if File.exist?("#{ENV['HOME']}/.embulk/bin/embulk")
+        "#{ENV['HOME']}/.embulk/bin/embulk"
+      elsif File.exist?("#{ENV['PWD']}/embulk.jar")
+        "#{ENV['PWD']}/embulk.jar"
       elsif File.exist?("/usr/local/bin/embulk")
         "/usr/local/bin/embulk"
       else
@@ -19,7 +22,7 @@ def embulk_path
     end
 
     def embulk_run(config_path)
-      Bundler.with_clean_env do
+      ::Bundler.with_clean_env do
         cmd = "#{embulk_path} run -X page_size=1 -b . -l trace #{config_path}"
         puts "=" * 64
         puts cmd