message: Extend unit tests for new range syntax
diff: @@ -341,4 +341,9 @@ CAF_TEST(ranges can use signed integers) {
  CHECK_RANGE("-2..+2..+2", -2, 0, 2);
  }
  +CAF_TEST(the parser rejects invalid step values) {
  + CAF_CHECK_EQUAL(r("-2..+2..-2"), pec::invalid_range_expression);
  + CAF_CHECK_EQUAL(r("+2..-2..+2"), pec::invalid_range_expression);
  +}
  +
  CAF_TEST_FIXTURE_SCOPE_END()
  