Throw exception in case of unknown argument

include/argparse.hpp

@@ -462,10 +462,13 @@ class ArgumentParser {
               auto tArgument = tIterator->second;
               it = tArgument->consume(it, end, tCurrentArgument);
             }
+            else {
+              throw std::runtime_error("Unknown argument");
+            }
           }
         }
         else {
-          ++it;
+          throw std::runtime_error("Unknown argument");
         }
       }
     }

test/test_invalid_arguments.hpp

@@ -34,5 +34,5 @@ TEST_CASE("Parse unknown optional argument", "[compound_arguments]") {
     .action([](const std::string& val) { return std::stoull(val); })
     .help("memory in MB to give the VMM when loading");
 
-  bfm.parse_args({ "./test.exe", "-om" });
+  REQUIRE_THROWS(bfm.parse_args({ "./test.exe", "-om" }));
 }