Adds tests/timeline_pipeline_tests.rs with end-to-end integration tests
that exercise the complete timeline pipeline against an in-memory SQLite
database with realistic data:
- pipeline_seed_expand_collect_end_to_end: Full scenario with an issue
closed by an MR, state changes, and label events. Verifies that seed
finds entities via FTS, expand discovers the closing MR through the
entity_references graph, and collect assembles a chronologically sorted
event stream containing Created, StateChanged, LabelAdded, and Merged
events.
- pipeline_empty_query_produces_empty_result: Validates graceful
degradation when FTS returns zero matches -- all three stages should
produce empty results without errors.
- pipeline_since_filter_excludes_old_events: Verifies that the since
timestamp filter propagates correctly through collect, excluding events
before the cutoff while retaining newer ones.
- pipeline_unresolved_refs_have_optional_iid: Tests the Option<i64>
target_iid on UnresolvedRef by creating cross-project references both
with and without known IIDs.
- shared_resolve_entity_ref_scoping: Unit tests for the new shared
resolve_entity_ref helper covering project-scoped lookup, unscoped
lookup, wrong-project rejection, unknown entity types, and nonexistent
entity IDs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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