Testing

Asynchronous I/O code is notoriously difficult to test. Real network operations introduce latency, non-determinism, and dependencies on external services—all of which make tests slow and fragile. Corosio provides test utilities that replace live networking with controllable, deterministic substitutes. You can stage data for reads, verify what your code writes, and inject errors at precise points—all without opening a single network connection. This section covers the tools and patterns that make thorough testing of I/O code practical and repeatable.