implement Wiki#update_page

test/test_wiki.rb

@@ -33,6 +33,22 @@ context "Wiki page writing" do
     assert_equal "tom@github.com", @wiki.repo.commits.first.author.email
   end
 
+  test "update_page" do
+    commit = { :message => "Gollum page",
+               :name => "Tom Preston-Werner",
+               :email => "tom@github.com" }
+    @wiki.write_page("Gollum", :markdown, "# Gollum", commit)
+
+    page = @wiki.page("Gollum")
+    @wiki.update_page(page, "# Gollum2", commit)
+
+    assert_equal 2, @wiki.repo.commits.size
+    assert_equal "# Gollum2", @wiki.page("Gollum").raw_data
+    assert_equal "Gollum page", @wiki.repo.commits.first.message
+    assert_equal "Tom Preston-Werner", @wiki.repo.commits.first.author.name
+    assert_equal "tom@github.com", @wiki.repo.commits.first.author.email
+  end
+
   teardown do
     FileUtils.rm_r(File.join(File.dirname(__FILE__), *%w[examples test.git]))
   end