Test JEKYLL_NO_BUNDLER_REQUIRE.

lib/jekyll/plugin_manager.rb

@@ -26,16 +26,21 @@ module Jekyll
     def require_gems
       site.gems.each do |gem|
         if plugin_allowed?(gem)
+          Jekyll.logger.debug("PluginManager:", "Requiring #{gem}")
           require gem
         end
       end
     end
 
     def self.require_from_bundler
-      unless ENV["JEKYLL_NO_BUNDLER_REQUIRE"]
+      if ENV["JEKYLL_NO_BUNDLER_REQUIRE"]
+        false
+      else
         require "bundler"
-        Bundler.require(:jekyll_plugins)
+        required_gems = Bundler.require(:jekyll_plugins)
+        Jekyll.logger.debug("PluginManager:", "Required #{required_gems.map(&:name).join(', ')}")
         ENV["JEKYLL_NO_BUNDLER_REQUIRE"] = "true"
+        true
       end
     rescue LoadError
       false

test/helper.rb

@@ -58,6 +58,13 @@ class Test::Unit::TestCase
     File.open("#{path}/index.html", "w"){ |f| f.write("I was previously generated.") }
   end
 
+  def with_env(key, value)
+    old_value = ENV[key]
+    ENV[key] = value
+    yield
+    ENV[key] = old_value
+  end
+
   def capture_stdout
     $old_stdout = $stdout
     $stdout = StringIO.new

test/test_plugin_manager.rb

@@ -2,7 +2,15 @@ require 'helper'
 
 class TestPluginManager < Test::Unit::TestCase
   def test_requiring_from_bundler
+    with_env("JEKYLL_NO_BUNDLER_REQUIRE", nil) do
       Jekyll::PluginManager.require_from_bundler
       assert ENV["JEKYLL_NO_BUNDLER_REQUIRE"], 'Gemfile plugins were not required.'
     end
+  end
+
+  def test_blocking_requiring_from_bundler
+    with_env("JEKYLL_NO_BUNDLER_REQUIRE", "true") do
+      assert_equal false, Jekyll::PluginManager.require_from_bundler, "Gemfile plugins were required but shouldn't have been"
+    end
+  end
 end