message: das.test: fix and enable a cli test
diff: @@ -223,8 +223,8 @@ void
  flag()
  {
  auto const f =
  - [] (std::string const& foo, int baz) { return foo + std::to_string(baz); };
  - auto const proto = das::named::prototype(foo, baz);
  + [] (std::string const& foo, int bar) { return foo + std::to_string(bar); };
  + auto const proto = das::named::prototype(foo, bar);
  BOOST_CHECK_THROW(das::cli::call(proto, f, {"--foo", "--bar", "bar"}),
  das::cli::OptionValueError);
  BOOST_CHECK_THROW(das::cli::call(proto, f, {"--foo", "foo", "--bar"}),
  @@ -432,6 +432,7 @@ ELLE_TEST_SUITE()
  conversions->add(BOOST_TEST_CASE(multiple_integers));
  }
  master.add(BOOST_TEST_CASE(defaults));
  + master.add(BOOST_TEST_CASE(flag));
  {
  auto suite = BOOST_TEST_SUITE("short_options");
  master.add(suite);
  