compute directory path of pages

test/test_page.rb

@@ -16,8 +16,14 @@ context "Page" do
     assert_equal Gollum::Page, page.class
     assert page.raw_data =~ /^# Bilbo Baggins\n\nBilbo Baggins/
     assert page.formatted_data =~ /<h1>Bilbo Baggins<\/h1>\n\n<p>Bilbo Baggins/
+    assert_equal 'Bilbo-Baggins.md', page.path
     assert_equal :markdown, page.format
-    assert_equal 'df26e61e707116f81ebc6b935ec6d1676b7e96c4', page.version.id
+    assert_equal 'fbabba862dfa7ac35b39042dd4ad780c9f67b8cb', page.version.id
+  end
+
+  test "get nested page" do
+    page = @wiki.page('Eye Of Sauron')
+    assert_equal 'Mordor/Eye-Of-Sauron.md', page.path
   end
 
   test "no page match" do