Implement validation of unsupported smt2 response

Author: thomasspriggs

src/solvers/smt2_incremental/smt_response_validation.cpp

@@ -48,6 +48,8 @@ response_or_errort<smt_responset> validate_smt_response(const irept &parse_tree)
       smt_check_sat_responset{smt_unknown_responset{}}};
   if(parse_tree.id() == "success")
     return response_or_errort<smt_responset>{smt_success_responset{}};
+  if(parse_tree.id() == "unsupported")
+    return response_or_errort<smt_responset>{smt_unsupported_responset{}};
   return response_or_errort<smt_responset>{"Invalid SMT response \"" +
                                            id2string(parse_tree.id()) + "\""};
 }

unit/solvers/smt2_incremental/smt_response_validation.cpp

@@ -51,6 +51,13 @@ TEST_CASE("Validation of SMT success response", "[core][smt2_incremental]")
     smt_success_responset{});
 }
 
+TEST_CASE("Validation of SMT unsupported response", "[core][smt2_incremental]")
+{
+  CHECK(
+    *validate_smt_response(*smt2irep("unsupported").parsed_output)
+       .get_if_valid() == smt_unsupported_responset{});
+}
+
 TEST_CASE(
   "Error handling of SMT response validation",
   "[core][smt2_incremental]")