@Test
public void testOutdent() {

  Parser<Token> parser = new Indentation().outdent();
  assertEquals(new Token(0, 0, Indentation.Punctuation.OUTDENT),
      parser.from(Parsers.constant(tokenList(Indentation.Punctuation.OUTDENT))).parse("", mode));
  Asserts.assertFailure(mode, parser.from(Parsers.constant(tokenList(Indentation.Punctuation.INDENT))), "",
      1, 1, "OUTDENT expected, INDENT encountered.");
}