@Test
public void testParseAndPrintExtension() throws Exception {

  final String program = ""
      + "#\textension GL_EXT_gpu_shader5 : enable\nvoid main() { }";
  final String expected = ""
      + "#extension GL_EXT_gpu_shader5 : enable\nvoid main()\n{\n}\n";
  assertEquals(expected, PrettyPrinterVisitor.prettyPrintAsString(ParseHelper.parse(program
  )));
}