How to Fix a Test That Cannot Assert on Log Output

Engines like Unity fail a test if it logs an error unless you declare you expect it. Expecting the log both asserts it happened and prevents the spurious failure.

How to fix it

1. Expect the log explicitly

In Unity call LogAssert.Expect(LogType.Error, "expected message") before the action; this asserts the message was logged and prevents the expected error from failing the test.

2. Match with a regex when text varies

Use a regex matcher for messages that include dynamic values, so the assertion checks the stable part of the message without over-specifying the exact text.

3. Fail on unexpected logs

Keep the default that an unexpected logged error fails the test, so a new error introduced by a regression still trips the suite rather than passing silently.

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 Unity 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.