Knowledge Base > Troubleshooting > Working with code R010

Working with code R010

If you receive the output code R010, this means that Diffblue Cover timed out while writing tests for a method. The timeout could be caused by very slow operations, or by code that waits for user input.

While methods that implement I/O operations are not unit testable, we suggest checking if this method also contains business logic that needs to be verified. If that’s the case, in order to have tests for the business logic, and consequently increase line coverage, refactor your code so that any non-I/O logic is contained in a separate, unit-testable method.