mono/mcs/class/System.Web/Test/mainsoft/NunitWebResources/WebMapping.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.web>
    <urlMappings enabled="true">
      <add url="~/Mapping.aspx" mappedUrl="~/Mapping1.aspx"/>
    </urlMappings>
  </system.web>
</configuration>