Vagrant.config.home now returns nil if home is nil, otherwise expands path

lib/vagrant/config.rb

@@ -124,7 +124,7 @@ module Vagrant
       attr_accessor :home
 
       def home
-        File.expand_path(@home)
+        @home ? File.expand_path(@home) : nil
       end
     end
 

test/vagrant/config_test.rb

@@ -187,4 +187,21 @@ class ConfigTest < Test::Unit::TestCase
       end
     end
   end
+
+  context "vagrant configuration" do
+    setup do
+      @config = Vagrant::Config::VagrantConfig.new
+    end
+
+    should "return nil if home is nil" do
+      File.expects(:expand_path).never
+      assert @config.home.nil?
+    end
+
+    should "expand the path if home is not nil" do
+      @config.home = "foo"
+      File.expects(:expand_path).with("foo").once.returns("result")
+      assert_equal "result", @config.home
+    end
+  end
 end