Add SpanCollector tests

[leynos]

Summary

• add unit tests for SpanCollector

Testing

• make fmt
• make lint
• make test

---

https://chatgpt.com/codex/tasks/task_e_685fdacd5ce88322a1bfdbcb7e28684f

Summary by Sourcery

Add unit tests for SpanCollector to verify its initialization and into_parts behavior

Tests:

• Verify that SpanCollector::new correctly initializes the stream cursor, tokens, source, and empty spans
• Verify that SpanCollector::into_parts returns the collected spans and extra data

[sourcery-ai]

Reviewer's Guide

This PR introduces a new test module for SpanCollector, adding two unit tests that verify the collector’s initialization and its into_parts method.

Class diagram for SpanCollector test additions

classDiagram
    class SpanCollector {
        +new(tokens, src, extra)
        +into_parts()
        spans
        stream
        extra
    }
    class SpanCollectorTest {
        +new_initialises_stream_and_state()
        +into_parts_returns_collected_spans_and_extra()
    }
    SpanCollectorTest ..> SpanCollector : tests

Loading

File-Level Changes

Change	Details	Files
Introduce test module with unit tests for SpanCollector	Add rstest-based test for new() initialization (cursor, tokens, source, empty spans) Add test for into_parts() returning collected spans and extra value	src/parser/span_collector.rs

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