If you're distributing some products for MetaTrader 4/5 via the Market, you probably know that a special "welcome" stage of automatic product validation has been added recently by MetaQuotes on the site. It starts just after you submit a compiled file, in case that all other stuff is already filled in. Only products that passed the validation successfully can be sent to moderators for manual checkup.
What this automatic validation does exactly is a secret, but developers receive many negative test reports for their new and updated products, so it's possible to deduce some rules and tests running behind the scenes. And most important, that we can suggest some methods to pass the validation if it failed with one of known errors.
The automatic validation performs a non-visual test of the product on 4 different symbols and timeframes (which may vary). Here is an example of the test list for MetaTrader 5:
- EURUSD,H1 (netting)
- XAUUSD,D1 (netting)
- GBPUSD,M30 (netting)
- EURUSD,M1 (netting)
Of course, a developer should make his/her product in strict accordance with the documentation (MetaTrader 5, MetaTrader 4). In addition, there is a number of guides specifically prepared for product publishers, such as:
- The checks a trading robot must pass before publication in the Market
- How to Test a Trading Robot Before Buying
Nevertheless, you may still encounter problems with the validation, even if all requirements stated in the abovementioned documents are met. Here is the list of errors known to arise most frequently:
- Not available
- Empty strategy tester report
- There are no trading operations
- Tester takes too long
- Log files size exceeded 2053 MB, test terminated
If you know an error not listed here and specific to the validator itself (not an error in your product), please, let me know.
Let's consider them one by one.
This is an internal error of the automatic validation infrastructure. It's not related to your product. You can do nothing. Just wait a bit for MetaQuotes to fix the problem. If you think you waited enough and the problem is still there, write to the service desk, and wait more ;-).
Empty strategy tester report
The same as above, but it seems to be less severe than "Not available", so you will probably wait a shorter period before it vanishes "automatically".
There are no trading operations
This error is specific for expert advisers only. The rule is: expert advisers must trade. If your robot should be used only on a specific symbol timeframe, then here is what MetaQuotes say: "Products can not apply restrictions. All limitations should be marked as recommendations in the product description." If your robot does not trade by design (a helper tool, for example), choose approriate category ("Utilities") in the product properties.
One of possible reasons for this error to come is when your code contains a checkup like this:
Such conditions should be accompanied with IsTesting()/MQLInfoInteger(MQL_TESTER) call. The automatic tester is not connected to an account, and the tester is always considered as allowed to trade. Correct code should be:
Tester takes too long time
The product performs too lengthy operations and its source code should be improved (refactored). The real time limit for the test is somewhat about 30 minutes for a submission, but range of dates for testing is not known at the moment. Hardware being used on the servers is not known as well. Nevertheless you may try the following approaches:
- Run the built-in profiler and try to optimize/remove most lengthy parts of code.
- Eliminate objects, canvases, drawings while testing is performed without visual mode (this is the mode used by the automatic validator).
MQL4 notation to check this
bool allowLenghtyOperations = !IsTesting() || IsVisualMode();
bool allowLenghtyOperations = !MQLInfoInteger(MQL_TESTER) || MQLInfoInteger(MQL_VISUAL_MODE);
- Add special parameter to limit number of bars to calculate.
- Implement some throttling technique, for example instead of updates on every tick do it not frequently than every N seconds.
Log files size exceeded 2053 MB, test terminated
This can be both a problem in your product or in the validator state. Make sure you do not generate too many prints in your code, test it locally in different environments to make sure that infinite loops are eliminated and unrecoverable trading errors are handled appropriately.