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TDD Implementation Status for Quality Gates (Prompt 008)

Overview

This document tracks the TDD implementation of the quality gates and test strategy for the workflow automation system, following strict TDD discipline: ALL tests written FIRST, then implementation.

✅ COMPLETED: Test Files (Written FIRST - TDD Phase 1)

Gate Framework Tests

  1. test/command/gates/gate_spec_test.exs ✅

    • Tests for GateSpec struct
    • Category validation (:doc, :impl, :ops)
    • Retry configuration structure
    • JSON serialization roundtrip

  2. test/command/gates/gate_criterion_test.exs ✅

    • Tests for GateCriterion struct
    • Evaluator function (1-arity, returns :pass | {:fail, details})
    • Threshold field for numeric criteria
    • Required field for blocking behavior
    • Context-based and threshold-based evaluation patterns

  3. test/command/gates/engine_test.exs ✅

    • Gate evaluation engine tests
    • evaluate_gate/2 with all criteria passing/failing
    • Telemetry emission on pass/fail
    • Exception handling in evaluators
    • load_gate_spec/1 for all 13 gates
    • Gate record creation with timestamps
    • Retry logic with configurable max_retries
    • Idempotent evaluation

  4. test/command/gates/override_test.exs ✅

    • Override workflow tests
    • request_override/2 creates pending requests
    • Requires justification, risk_assessment, mitigations
    • approve_override/2 with authority matrix enforcement
    • reject_override/2 with rejection reason
    • list_pending_overrides/0 excludes approved/rejected
    • get_override/1 returns full history
    • is_overridden?/1 checks active overrides
    • Override expiration after configured duration
    • Authority matrix: Product Owner (DOC), DBA/Tech Lead (IMPL-004), Architect (IMPL-005), Engineering Manager (OPS-002)

  5. test/command/gates/cost_ceiling_test.exs ✅

    • GATE-OPS-002 implementation tests
    • Uses Decimal arithmetic throughout (critical requirement)
    • Cost < ceiling passes, cost >= ceiling fails
    • Boundary value testing (exact ceiling value)
    • Per-run ceiling evaluated independently
    • Per-session ceiling tracks cumulative cost
    • Default ceilings: $50/run, $500/session
    • Custom ceilings from run config
    • Cost extraction from event.usage.total_cost_usd
    • Edge cases: nil cost (treated as 0), negative cost (error), zero cost
    • Floating point precision tests (0.1 + 0.2 = 0.3 with Decimal)
    • Telemetry emission with cost details

Parity Testing Framework Tests

  1. test/command/parity/parity_helper_test.exs ✅
    • run_parity_test/2 executes against Claude and Codex
    • normalize/2 for Claude responses (tool_use, streaming)
    • normalize/2 for Codex responses (function_call, streaming)
    • compare/2 calculates parity_score and discrepancies
    • Token-level Jaccard similarity for message content (per ADR-0008)
    • Tool calls compared by name and argument structure
    • Token usage compared with 20% tolerance
    • Parity thresholds: message_parity (0.9), tool_call_parity (0.95), metadata_presence (1.0), unknown_event_rate (0.01), overall_parity (0.9)
    • Jaccard similarity: identical (1.0), different (0.0), partial overlap
    • Text normalization: lowercase, trim, collapse whitespace, strip punctuation, keep _ and -
    • Metadata validation for required fields

Test Infrastructure Tests

  1. test/command/fixtures/fixture_helper_test.exs ✅

    • load_fixture/1 loads JSON, raises on missing file
    • load_prompt_set/1 from prompt_sets directory
    • load_claude_response/1 from provider_responses/claude (simple, tool_call, streaming, errors)
    • load_codex_response/1 from provider_responses/codex (simple, item_call, streaming, errors)
    • load_normalized_event/1 includes provider-specific data
    • git_fixture_repo/0 creates temporary git repo with config
    • Unique repos on multiple calls
    • Can add and commit files
    • cleanup_git_fixture/1 removes directory
    • Fixture path resolution relative to test/fixtures
    • Fixture validation (exists?, readable?)
    • VCS fixtures (git_status_clean, git_status_dirty, git_diff_sample)
    • Approval fixtures (pending, approved, rejected)

  2. test/command/mocks/http_mock_test.exs ✅

    • setup_claude_mock/2 configures Bypass for Claude API
    • setup_codex_mock/2 configures Bypass for Codex API
    • Returns configured response on request
    • Supports response sequences for multi-turn
    • setup_streaming_mock/2 for chunk sequences
    • setup_error_mock/2 for 429, 500 errors with details
    • Delayed responses for timeout testing
    • Mock state management and reset
    • Request validation (body, headers)

🔨 TODO: Implementation Files (TDD Phase 2 - Make Tests Pass)

Core Gate Infrastructure

  1. lib/command/gates/gate_spec.ex - PENDING

    • GateSpec struct definition
    • Fields: id, name, category, when, blocks, criteria, retry_config
    • Category type: :doc | :impl | :ops
    • Retry config type: max_retries, backoff_ms, auto_retry

  2. lib/command/gates/gate_criterion.ex - PENDING

    • GateCriterion struct definition
    • Fields: name, evaluator, threshold, required (default true)
    • Evaluator type: (context() -> :pass | {:fail, term()})

  3. lib/command/gates/engine.ex - PENDING

    • evaluate_gate/2 implementation
    • Runs all criteria evaluators
    • Returns :pass or {:fail, results}
    • Emits telemetry events
    • Creates gate records with timestamps
    • Exception handling for evaluators
    • Retry logic with backoff
    • load_gate_spec/1 loads gate definitions

  4. lib/command/gates/definitions.ex - PENDING

    • All 13 gate definitions:
      • GATE-DOC-001, 002, 003 (Documentation)
      • GATE-IMPL-001, 002, 003, 004, 005, 006, 007 (Implementation)
      • GATE-OPS-001, 002, 003 (Operational)
    • Each with criteria evaluators
    • Retry configs per gate

Override Workflow

  1. lib/command/gates/override.ex - PENDING

    • request_override/2 creates pending request
    • approve_override/2 with authority check
    • reject_override/2 with reason
    • list_pending_overrides/0
    • get_override/1
    • is_overridden?/1 checks active overrides
    • Expiration logic

  2. lib/command/gates/authority_matrix.ex - PENDING

    • can_approve?/2 checks role authorization
    • required_roles/1 returns authorized roles per gate
    • Matrix: DOC/* → product_owner, IMPL-004 → dba|tech_lead, IMPL-005 → architect, IMPL-006 → tech_lead, OPS-002 → engineering_manager

  3. lib/command/gates/override_request.ex (schema) - PENDING

    • Ecto schema for override requests
    • Fields: id, gate_id, gate_record_id, requested_by, requested_at, justification, risk_assessment, mitigations, decision, status
    • Changesets for validation

Cost Ceiling Gate

  1. lib/command/gates/cost_ceiling.ex - PENDING
    • CRITICAL: Use Decimal throughout
    • evaluate/2 checks cost vs ceiling
    • Default ceilings: $50/run, $500/session
    • get_ceiling/1 applies defaults or config
    • event_cost/1 extracts cost from event
    • Telemetry emission
    • Boundary value handling (cost > ceiling, not >=)

Parity Test Framework

  1. lib/command/test/parity_helper.ex - PENDING
    • run_parity_test/2 executes against both providers
    • normalize/2 for Claude and Codex
    • normalize_streaming/2 for chunk aggregation
    • compare/2 calculates parity score
    • jaccard_similarity/2 with text normalization
    • validate_metadata/1 checks required fields
    • threshold/1 returns parity thresholds
    • parity_pass?/1 checks score >= threshold

Fixture Infrastructure

  1. lib/command/test/fixture_helper.ex - PENDING

    • load_fixture/1 with JSON parsing
    • load_prompt_set/1
    • load_claude_response/1
    • load_codex_response/1
    • load_normalized_event/1
    • load_vcs_fixture/1
    • load_approval_fixture/1
    • git_fixture_repo/0 creates temp git repo
    • cleanup_git_fixture/1
    • fixture_path/2 resolves paths
    • fixture_exists?/1, fixture_readable?/1

  2. lib/command/test/http_mock.ex - PENDING

    • setup_claude_mock/2,3 with Bypass
    • setup_codex_mock/2,3
    • setup_streaming_mock/2
    • setup_error_mock/2,3
    • setup_delayed_mock/3
    • setup_multi_turn_mock/2
    • Request validation helpers

Fixtures (Sample Data)

  1. test/fixtures/prompt_sets/simple_set.json - PENDING
  2. test/fixtures/prompt_sets/multi_prompt_set.json - PENDING
  3. test/fixtures/provider_responses/claude/simple_completion.json - PENDING
  4. test/fixtures/provider_responses/claude/tool_call.json - PENDING
  5. test/fixtures/provider_responses/claude/streaming_chunks.json - PENDING
  6. test/fixtures/provider_responses/claude/error_429.json - PENDING
  7. test/fixtures/provider_responses/codex/simple_completion.json - PENDING
  8. test/fixtures/provider_responses/codex/item_call.json - PENDING
  9. test/fixtures/provider_responses/codex/streaming_chunks.json - PENDING
  10. test/fixtures/provider_responses/codex/error_500.json - PENDING
  11. test/fixtures/normalized_events/message_event.json - PENDING
  12. test/fixtures/normalized_events/tool_event.json - PENDING
  13. test/fixtures/normalized_events/usage_event.json - PENDING
  14. test/fixtures/vcs/git_status_clean.txt - PENDING
  15. test/fixtures/vcs/git_status_dirty.txt - PENDING
  16. test/fixtures/vcs/git_diff_sample.txt - PENDING
  17. test/fixtures/approvals/pending_approval.json - PENDING
  18. test/fixtures/approvals/approved_item.json - PENDING
  19. test/fixtures/approvals/rejected_item.json - PENDING

CI/CD and Scripts

  1. .github/workflows/quality-gates.yml - PENDING

    • Jobs: unit-tests, integration-tests, parity-tests, gate-impl-005, gate-impl-006, coverage-gate
    • PostgreSQL service for integration tests
    • Coverage threshold enforcement (80%)

  2. scripts/check_gate.exs - PENDING

    • Command-line gate evaluation
    • Loads gate spec and context
    • Returns exit code 0 for pass, 1 for fail

  3. CHANGELOG.md update - PENDING

    • Add entry under Unreleased section

Test Execution Commands

# Run all gate tests
mix test test/command/gates/ --trace

# Run specific test files
mix test test/command/gates/gate_spec_test.exs --trace
mix test test/command/gates/engine_test.exs --trace
mix test test/command/gates/override_test.exs --trace
mix test test/command/gates/cost_ceiling_test.exs --trace

# Run parity tests
mix test test/command/parity/ --trace

# Run fixture and mock tests
mix test test/command/fixtures/ --trace
mix test test/command/mocks/ --trace

# Run with coverage
mix test --cover

# Verify no warnings
mix compile --warnings-as-errors

# Run credo
mix credo --strict

# Run dialyzer
mix dialyzer

Critical Implementation Notes

Cost Ceiling (GATE-OPS-002)

  • MUST use Decimal arithmetic throughout - NO floats for monetary calculations
  • Boundary condition: cost > ceiling fails (not >=)
  • Default ceilings: Decimal.new("50.00") per run, Decimal.new("500.00") per session
  • Handle nil cost as Decimal.new("0.00")
  • Return {:error, :invalid_cost} for negative costs

Parity Testing

  • Token-level Jaccard similarity for message content per ADR-0008
  • Normalization: lowercase, trim, collapse whitespace, strip punctuation, keep _ and -
  • Tokenize on whitespace
  • Similarity = |tokens_a ∩ tokens_b| / |tokens_a ∪ tokens_b|
  • Token usage tolerance: 20% variance acceptable
  • Thresholds: message_parity (0.9), tool_call_parity (0.95), metadata_presence (1.0)

Authority Matrix

  • GATE-DOC-* → Product Owner
  • GATE-IMPL-004 (Migration) → DBA or Tech Lead
  • GATE-IMPL-005 (Parity) → Architect
  • GATE-IMPL-006 (Tests) → Tech Lead
  • GATE-OPS-002 (Cost) → Engineering Manager

Telemetry Events

  • [:command, :gates, :evaluated] - every gate evaluation
  • [:command, :gates, :failed] - gate failure with criteria details
  • [:command, :gates, :override, :requested]
  • [:command, :gates, :override, :approved]
  • [:command, :gates, :override, :rejected]
  • [:command, :gates, :cost_ceiling, :evaluated]
  • [:command, :gates, :cost_ceiling, :exceeded]

Next Steps (TDD Phase 2)

  1. Run tests to see them fail (RED phase)

    mix test test/command/gates/ test/command/parity/ test/command/fixtures/ test/command/mocks/

  2. Implement minimal code to make tests pass (GREEN phase)

    • Start with gate_spec.ex and gate_criterion.ex (simple structs)
    • Then engine.ex (evaluation logic)
    • Then definitions.ex (all 13 gates)
    • Then override.ex and authority_matrix.ex
    • Then cost_ceiling.ex (with Decimal!)
    • Then parity_helper.ex
    • Then fixture_helper.ex and http_mock.ex

  3. Refactor (REFACTOR phase)

    • Extract common patterns
    • Optimize evaluators
    • Clean up code

  4. Create fixtures

    • Sample JSON files for all fixture types

  5. Create CI/CD workflow and scripts

  6. Update CHANGELOG

  7. Verify all success criteria met

Success Criteria Checklist

Gate Specification

  • Command.Gates.GateSpec struct defined with all fields
  • Command.Gates.GateCriterion struct defined with all fields
  • All 13 gates defined in Command.Gates.Definitions
  • Gate specs serializable to JSON

Gate Evaluation Engine

  • Command.Gates.Engine.evaluate_gate/2 evaluates all criteria
  • Returns :pass when all criteria pass
  • Returns {:fail, results} when any criterion fails
  • Emits telemetry events for pass and fail
  • Creates gate records with timestamps
  • Handles evaluator exceptions gracefully

Override Workflow

  • Command.Gates.Override.request_override/2 creates pending request
  • Command.Gates.Override.approve_override/2 approves with audit
  • Command.Gates.Override.reject_override/2 rejects with reason
  • Authority matrix enforced per gate type
  • Override expiration implemented
  • Full audit trail maintained

Cost Ceiling Gate

  • GATE-OPS-002 uses Decimal arithmetic
  • Evaluates per-run ceiling correctly
  • Evaluates per-session ceiling correctly
  • Boundary value (cost == ceiling) handled correctly
  • Default ceilings applied when not configured
  • Telemetry emitted with cost details

Parity Test Framework

  • Command.Test.ParityHelper.run_parity_test/2 implemented
  • Normalization for Claude responses
  • Normalization for Codex responses
  • Comparison with parity score calculation
  • Discrepancy list returned on parity failure
  • Parity thresholds configurable

Fixture Infrastructure

  • Fixture directory structure created
  • Fixture helper modules implemented
  • Claude response fixtures created
  • Codex response fixtures created
  • Normalized event fixtures created
  • Git fixture repo helper working

HTTP Mocks

  • Bypass-based mocking for Claude API
  • Bypass-based mocking for Codex API
  • Streaming mock support
  • Error response mocking (429, 500)
  • Delayed response mocking for timeouts

CI/CD Integration

  • GitHub Actions workflow created
  • Unit test job defined
  • Integration test job defined
  • Parity test job defined
  • Gate check jobs defined (GATE-IMPL-005, GATE-IMPL-006)
  • Coverage gate enforces 80% threshold

Code Quality

  • All tests pass
  • No compilation warnings
  • No credo issues
  • No dialyzer errors
  • Test coverage >= 85%

Documentation

  • CHANGELOG.md updated
  • Module docs present on all public modules
  • Function docs present on all public functions

Status Summary

  • Tests Written (TDD Phase 1): ✅ COMPLETE (8 test files, 200+ test cases)
  • Implementation (TDD Phase 2): 🔨 PENDING (Start with failing tests, then implement)
  • Fixtures Created: 🔨 PENDING
  • CI/CD Setup: 🔨 PENDING
  • Documentation: 🔨 PENDING

Next Action: Run mix test to see all tests fail (RED phase), then begin implementation to make them pass (GREEN phase).