Phase 02 Verification: Test Performance

Verdict: PASS Date: 2026-02-18 Tier: Deep

Requirements Verification

Requirement	Status	Evidence
REQ-PERF-01: FeedFetcherTest split into 5+ classes	PASS	6 files created in test/lib/source_monitor/fetching/ (success, error_handling, adaptive_interval, retry_circuit, entry_processing, utilities)
REQ-PERF-02: Test log level set to :warn	PASS	config.log_level = :warn in test/dummy/config/environments/test.rb
REQ-PERF-03: Integration tests excludable	PASS	lib/tasks/test_fast.rake provides test:fast task (1022 tests vs 1033 full)
REQ-PERF-04: Default parallelism switched to threads	PASS	parallelize(workers: worker_count, with: :threads) in test_helper.rb
REQ-PERF-05: DB-heavy files use setup_once/before_all	PASS	5 files now use setup_once (up from 1)

Checks Performed

Structural Checks

• 6 split test files exist in test/lib/source_monitor/fetching/
• Original feed_fetcher_test.rb deleted
• Shared helper module exists (feed_fetcher_test_helper.rb)
• Each split file includes FeedFetcherTestHelper
• Test count preserved: 71 tests across 6 files (5+13+6+6+8+33)
• config.log_level = :warn present in test.rb
• lib/tasks/test_fast.rake exists and is valid Ruby
• parallelize uses with: :threads for all modes
• setup_once used in 5 files (sources_index_metrics, source_activity_rates, source_fetch_interval_distribution, upcoming_fetch_schedule, query_test)

Runtime Checks

• Full test suite: 1033 tests, 0 failures, 0 errors
• Single-file runs work without PARALLEL_WORKERS=1 (PG segfault eliminated)
• Each split file passes individually with PARALLEL_WORKERS=1
• test:fast runs 1022 tests (excludes 11 integration/system tests)
• Two consecutive full suite runs: 0 flaky failures

Quality Checks

• RuboCop: 0 offenses across all modified files
• Brakeman: 0 warnings
• No test isolation regressions

Commits

• 912665f: perf(02-03): adopt setup_once/before_all in DB-heavy test files
• a951c95: feat(02-01): split FeedFetcherTest into 6 concern-based test classes
• edbfe23: perf(02-02): reduce test log IO and add test:fast rake task
• eceb06d: perf(test): switch default parallelism from forks to threads

Notes

• TestProf emits cosmetic warning "before_all is not implemented for parallalization with threads" — does not affect correctness. before_all/setup_once works correctly because single-file runs stay below parallelization threshold, and full suite distributes by class.
• PLAN-02 deviated from plan: --exclude-pattern is not a Minitest feature, so Dir glob approach was used instead. Functionally equivalent.