Adding some more tests

core/dbc_statement_handler.cpp

@@ -368,8 +368,7 @@ void DbcSignalHandler::Handle(const std::string &line, DbcParseContext &context)
 }
 
 void DbcCommentHandler::Handle(const std::string &line, DbcParseContext &context) const {
-    if (line.compare(0U, 4U, "CM_ ") == 0)
-        ParseCommentLine(line, context.database);
+    ParseCommentLine(line, context.database);
 }
 
 DbcStatementDispatcher::DbcStatementDispatcher() {