tests/org.eclipse.ui.tests/data/org.eclipse.newEncoding1/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>
<plugin>

     <extension
         id="testDynamicEncodingAddition"
         point="org.eclipse.ui.encodings">
      <encoding name="Cp1257"/>
   </extension>
 

</plugin>