Why We Test Trading Platform Releases
By Semenov Viktor, CTO, Alfa Algorithms Cyprus Ltd
A trading platform can accept an order and still produce the wrong financial result. A position may close correctly while its margin remains reserved. A repeated request may apply an operation twice. Two individually valid actions may conflict when they execute together.
As CTO, I consider release testing essential because these failures affect client funds, risk decisions and a broker's ability to explain what happened. Our tests are designed to check the outcome of trading operations, not simply whether an API returns success.
What the tests protect¶
The regression suite exercises trading, account finance, commissions, swaps, margin, stop-out, permissions, market data and recovery. These areas are connected: a symbol setting can change a calculation, a group rule can change execution, and an account update can change what a client is allowed to do.
Known inputs allow an independent financial model to calculate expected results. We compare those expectations with account values and trade history. Race tests exercise overlapping operations; restart and recovery checks examine whether state remains consistent after interruption.
Why every release needs a new run¶
A previous passing result belongs to a previous combination of code, configuration and test scope. Even a small change can affect shared logic used far beyond the feature being updated. That is why regression testing belongs before every release, alongside review and targeted checks of new functionality.
When a test fails, the next step is investigation, correction and another run—not treating an old report as approval of the new candidate.
A public result with a defined scope¶
The successful regression report from 3 October 2026 records build 1.25.250, 105,860 passed assertions and zero failed assertions. These are individual checks, not 105,860 distinct scenarios or a percentage of total coverage.
That report documents the suite available on that date. A later run on 4 October, after adding a trade-mutation block, recorded failures requiring investigation. The earlier pass does not establish that the expanded suite passed.
Public evidence makes the result inspectable. It does not promise bug-free software. For a fuller explanation of the testing approach, release decisions and coverage boundaries, read Trading Platform Testing Before Every Release, or visit our public test stand.