What causes currency bugs like overflow, underflow, and duplication?

Economy code is tested with normal values, so edge cases — overflow at the cap, going negative, duplication on retry — slip through and break the economy.

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Test Edge Cases in Your Economy and Currency

Quick answer: Add tests for currency edge cases including caps, zero, negative attempts, and concurrent changes, so the economy stays correct under abuse and error.

Economy bugs like duplication or overflow are devastating and easy to miss. Edge-case tests catch them. Here is how.

How to fix it

1. Test the boundaries

Cover the cap, zero, and attempts to go negative so limits hold.

2. Test concurrency and retries

Verify concurrent and retried transactions cannot duplicate or lose currency.

3. Assert invariants

Check that totals always reconcile so the economy cannot silently drift.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.

Ship the fix, watch the signature disappear from the next build. That's how you know it's really gone.