Taylor Eernisse d338d68191 test: Add comprehensive test suite for MR ingestion ...

Introduces thorough test coverage for merge request functionality,
following the established testing patterns from issue ingestion.

New test files:
- mr_transformer_tests.rs: NormalizedMergeRequest transformation tests
  covering full MR with all fields, minimal MR, draft detection via
  title prefix and work_in_progress field, label/assignee/reviewer
  extraction, and timestamp conversion

- mr_discussion_tests.rs: MR discussion normalization tests including
  polymorphic noteable binding, DiffNote position extraction with
  line ranges and SHA triplet, and resolvable note handling

- diffnote_position_tests.rs: Exhaustive DiffNote position scenarios
  covering text/image/file types, single-line vs multi-line comments,
  added/removed/modified lines, and missing position handling

New fixtures:
- fixtures/gitlab_merge_request.json: Representative MR API response
  with nested structures for integration testing

Updated tests:
- gitlab_types_tests.rs: Add MR type deserialization tests
- migration_tests.rs: Update expected schema version to 6

Test design follows property-based patterns where feasible, with
explicit edge case coverage for nullable fields and API variants
across different GitLab versions.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-26 22:47:17 -05:00

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