glib/gio/tests/schema-tests/enum-with-bad-default.gschema.xml

<schemalist>
  <enum id='org.gtk.test.MyEnum'>
    <value nick='nospam' value='0'/>
    <value nick='spam' value='1'/>
    <value nick='ham' value='2'/>
    <value nick='eggs' value='3'/>
    <value nick='bangers' value='4'/>
    <value nick='mash' value='5'/>
  </enum>

  <schema id='org.gtk.test.schema'>
    <key name='test' enum='org.gtk.test.MyEnum'>
      <default>'nie'</default>
    </key>
  </schema>
</schemalist>