# Agents Package Test Coverage Expansion

- **Status**: completed
- **Created**: 2026-03-08
- **Branch**: feat/agents-test-coverage → chore/dag-dependency-cleanup → chore/remaining-tasks
- **Scope**: packages/agents, packages/dag-nodes

## Objective
Expand agents package test coverage from ~6% (8 test files / 117 source files) toward 60% target.

## Plan
- [x] Analyze existing test patterns and source structure
- [x] Write utils tests (errors, validation, message-converter, periodic-task)
- [x] Write tools/registry tests (tool-registry, function-tool, schema-converter)
- [x] Write AI provider manager tests
- [x] Write limits plugin and tool-execution-service tests
- [x] Activate 24 skipped tests (execution-service, agent-factory)
- [x] Implement execution caching (cache-key-builder, memory-cache-storage, execution-cache-service)
- [x] DAG node tests (gemini-image-edit 40 tests, seedance-video 21 tests)
- [x] Harness regression tests (38 tests)
- [x] Run all tests and fix failures
- [x] Build verification
- [x] Commit and push

## Progress
### 2026-03-08
- Identified 117 source files, 8 existing test files
- Launched parallel agents to write tests for utils, tools, managers, plugins
- Expanded from 8 to 18 test files (410 tests)
- Activated 24 skipped tests by fixing mock signatures
- Implemented execution caching with TDD (3 new test files, 22 tests)
- Added DAG node pure-function tests (61 tests across 2 packages)
- Added harness regression tests (38 tests)
- Final: 21 test files, 456 agents tests + 99 harness/dag-node tests = 555 total

## Decisions
- Prioritized core modules (utils, tools, managers, plugins) for maximum coverage impact
- Followed existing test patterns (vitest, vi.mock for logger, MockAIProvider)
- Cache implementation: SHA-256 integrity hash, LRU eviction, TTL expiry
- DAG node tests: focused on pure functions (normalization, validation) to avoid fetch mocking

## Blockers
- (none)

## Result
Test coverage expanded from 8 to 24 test files (555 tests total, 0 skipped).
Key deliverables: execution caching system, DAG node test coverage, harness regression tests.
Follow-up: agents plugin order verification and event hierarchy tracking (tracked in CURRENT-TASKS.md).
