Tweaked plugin directory handling, tests.

lib/jekyll/site.rb

@@ -14,17 +14,20 @@ module Jekyll
     # config - A Hash containing site configuration details.
     def initialize(config)
       self.config          = config.clone
-
       self.safe            = config['safe']
       self.source          = File.expand_path(config['source'])
       self.dest            = File.expand_path(config['destination'])
       self.plugins         = if config['plugins'].respond_to?('each')
                                # If plugins is an array, process it.
-                               config['plugins'].each { |directory| File.expand_path(directory) }
+                               Array(config['plugins']).map { |d| File.expand_path(d) }
                              else
                                # Otherwise process a single entry as an array.
+                               if config['plugins'].nil?
+                                 []
+                               else
                                  [File.expand_path(config['plugins'])]
                                end
+                             end
       self.lsi             = config['lsi']
       self.pygments        = config['pygments']
       self.permalink_style = config['permalink'].to_sym

test/test_site.rb

@@ -1,6 +1,27 @@
 require 'helper'
 
 class TestSite < Test::Unit::TestCase
+  context "configuring sites" do
+    should "have an array for plugins by default" do
+      site = Site.new(Jekyll::DEFAULTS)
+      assert_equal [File.join(Dir.pwd, '_plugins')], site.plugins
+    end
+
+    should "have an array for plugins if passed as a string" do
+      site = Site.new(Jekyll::DEFAULTS.merge({'plugins' => '/tmp/plugins'}))
+      assert_equal ['/tmp/plugins'], site.plugins
+    end
+
+    should "have an array for plugins if passed as an array" do
+      site = Site.new(Jekyll::DEFAULTS.merge({'plugins' => ['/tmp/plugins', '/tmp/otherplugins']}))
+      assert_equal ['/tmp/plugins', '/tmp/otherplugins'], site.plugins
+    end
+
+    should "have an array for plugins if nothing is passed" do
+      site = Site.new(Jekyll::DEFAULTS.merge({'plugins' => []}))
+      assert_equal [], site.plugins
+    end
+  end
   context "creating sites" do
     setup do
       stub(Jekyll).configuration do