Add unit tests for hooks

**Description**
Currently parsers lacks proper serialization support.

**Proposed solution**
Add configurable serialization with sensible defaults.

**Priority**: Low/Medium

No files or test entry points are named. Start by locating the hooks tests and parser serialization code, then clarify whether the goal is unit coverage for hooks or configurable parser serialization; done means the agreed behavior is covered by passing unit tests.

Written by the indexing model from the issue text.