The `stringToKey` function (lines 340-354) is a pure utility that converts a string (hex or z32 encoded) into a Buffer key. It is self-contained, has no internal dependencies, and can be reused in any project that needs to parse hypercore keys from user input.

The `resolveNameOrKeyToOpts` method demonstrates a robust pattern for accepting multiple input formats (Buffer, hex string, z32 string, hyper:// URL, DNS name) and resolving them to a key or name. While it depends on `resolveDNSToKey` and `stringToKey`, the pattern is clean and could be extracted with minimal adaptation for similar multi-format input handling.

The test file provides reusable patterns for setting up two SDK instances, connecting them via Hyperswarm, and verifying data replication across Hypercore, Hyperdrive, and Hyperbee. The use of `test-tmp` for temporary storage, `brittle` for assertions, and `once` for event handling makes these tests a good template for any hypercore-based integration testing.