public String anonymize(final ParseTree tree) {
    return build(tree);
  }
@Test
  public void shouldAnonymizeDefineUndefineProperty() {
    Assert.assertEquals("DEFINE variable='[string]';",
        anon.anonymize("DEFINE format = 'JSON';"));
    Assert.assertEquals("UNDEFINE variable;",
        anon.anonymize("UNDEFINE format;"));
  }