make markup take page as the param

test/test_markup.rb

@@ -1,9 +1,25 @@
 require File.join(File.dirname(__FILE__), *%w[helper])
 
 context "Markup" do
+  setup do
+    @path = testpath("examples/test.git")
+    FileUtils.rm_rf(@path)
+    Grit::Repo.init_bare(@path)
+    @wiki = Gollum::Wiki.new(@path)
+
+    commit = { :message => "Bilbo page",
+               :name => "Tom Preston-Werner",
+               :email => "tom@github.com" }
+    @wiki.write_page("Bilbo Baggins", :markdown, "a [[Bilbo Baggins]] b", commit)
+  end
+
+  teardown do
+    FileUtils.rm_r(File.join(File.dirname(__FILE__), *%w[examples test.git]))
+  end
+
   test "page link" do
-    data = "a [[Bilbo Baggins]] b"
-    output = Gollum::Markup.new("x.md", data).render
+    page = @wiki.page("Bilbo Baggins")
+    output = Gollum::Markup.new(page).render
     assert_equal %{<p>a <a href="Bilbo-Baggins">Bilbo Baggins</a> b</p>\n}, output
   end
 end