private void setStaticField(Class<?> clazz, String fieldName, String value){

// black magic due lack of PowerMock

try{

final Field field = clazz.getDeclaredField( fieldName );

Field modifiersField = Field.class.getDeclaredField("modifiers");

modifiersField.setAccessible(true);

modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);

field.setAccessible( true );

field.set( clazz, value );

}catch(Exception ex){

}

}