Unit testing trading logic before live deployment

Small automated tests can catch sizing, stop, time, and state errors before they reach an account.

Test decisions separately from the platform

A position-size function, session filter, stop calculation, or signal rule can often be tested with plain inputs before it is connected to MT5. Small tests make the intended behaviour precise and run quickly after every change.

Keep platform adapters thin so most of the strategy logic can be tested without a live terminal or broker connection.

Test dangerous boundaries

Focus on cases that can create account damage: zero or missing tick value, volume rounding, a stop on the wrong side, duplicate position state, a daily limit already breached, and a clock at the session boundary.

Test valid, invalid, and extreme contract specifications.
Test restart with an existing position.
Test rejected orders and partial execution responses.
Test that protection rules override new entries.

Use fixtures that explain the failure

A good test fixture is small and named for the scenario it represents. When a test fails, the output should explain what the algorithm was expected to do and why that matters for the account.

Testing does not prove profitability. It proves that the implementation follows the rules you intended to research and deploy.

Discuss this article

Ask a setup question, share a backtest, or compare notes with other algorithmic traders. Use a display name; your email remains private.

Create an account or sign in above to join the conversation.

Loading discussion…