# Testing Improvements from ADR-018

This document tracks the testing improvements achieved through the implementation of ADR-018 (Atomic Tools Architecture).

## Overview

ADR-018 introduced an atomic tools architecture with dependency injection to dramatically simplify test infrastructure and improve test execution speed.

## Problems Addressed

### Before ADR-018

| Problem                             | Impact                                       |
| ----------------------------------- | -------------------------------------------- |
| Deep orchestrator dependencies      | 50+ lines of mock setup per test             |
| ResearchOrchestrator blocking calls | 2-8 seconds per call, 850+ second test suite |
| Complex ESM mocking                 | Brittle tests with deep dependency chains    |
| Timeout failures                    | 37+ test timeout failures in CI              |
| Test file size                      | 300-400 lines per test file                  |

### Root Causes

1. **Orchestrator Pattern**: Tools depended on `ResearchOrchestrator` and `KnowledgeGraphManager` classes
2. **Sequential Execution**: Orchestrators execute sequentially, blocking test execution
3. **Token Overhead**: 5,000-6,000 tokens per session from orchestrator calls
4. **ESM Mocking Complexity**: `jest.unstable_mockModule()` required for deep dependency chains

## Solution: Atomic Tools with Dependency Injection

### Pattern

```typescript
// OLD: Orchestrator-based
import { ResearchOrchestrator } from '../utils/research-orchestrator.js';

export async function myTool(args) {
  const orchestrator = new ResearchOrchestrator(args.projectPath);
  const result = await orchestrator.answerResearchQuestion(args.query);
  // ... complex logic
}

// NEW: Atomic with DI
import { findFiles, readFile } from '../utils/file-system.js';

interface ToolDeps {
  fs?: { findFiles?: typeof findFiles; readFile?: typeof readFile };
}

export async function myTool(args, deps: ToolDeps = {}) {
  const fs = deps.fs ?? { findFiles, readFile };
  const files = await fs.findFiles(args.projectPath, '*.ts');
  // ... direct logic
}
```

### Test Pattern

```typescript
// OLD: Complex ESM mocking
beforeAll(async () => {
  await setupESMMocks({
    '../../src/utils/research-orchestrator.js': { ... },
    '../../src/utils/tree-sitter-analyzer.js': { ... },
    // ... 50+ lines of mocks
  });
});

// NEW: Simple DI
test('myTool finds files', async () => {
  const mockFs = {
    findFiles: jest.fn().mockResolvedValue(['file1.ts']),
    readFile: jest.fn().mockResolvedValue('content'),
  };

  const result = await myTool({ projectPath: '/test' }, { fs: mockFs });
  expect(result).toBeDefined();
});
```

## Tools Migrated

### Phase 2: High-Priority Tools

#### 1. review-existing-adrs-tool.ts ✅

**Changes**:

- Removed `import { ResearchOrchestrator }`
- Eliminated orchestrator instantiation (line 187)
- Replaced 2-8 second blocking research call with static context
- Simplified environment analysis section
- Tool now recommends using `environment-analysis-tool` separately

**Benefits**:

- No more 2-8 second blocking calls
- Reduced complexity by ~16 lines
- Better separation of concerns (ADR compliance vs environment analysis)
- Maintains all ADR compliance checking functionality

**Test Impact**:

- Test file already uses functional testing (no complex mocks)
- Test execution should be faster (no orchestrator delays)
- Tests remain simple and maintainable

#### 2. adr-suggestion-tool.ts (Planned)

**Current State**:

- Uses `ResearchOrchestrator` for environment research
- Has complex orchestrator-based logic

**Migration Plan**:

- Remove ResearchOrchestrator dependency
- Use direct utility calls for ADR discovery
- Simplify suggestion generation logic

#### 3. environment-analysis-tool.ts (Planned)

**Current State**:

- Uses `ResearchOrchestrator` for environment queries
- Complex orchestrator-based analysis

**Migration Plan**:

- Remove ResearchOrchestrator dependency
- Use direct environment utility calls
- Simplify analysis flow

## Test Infrastructure Improvements

### esm-mock-helper.ts Evolution

**Current State**:

- Provides `setupESMMocks()` for complex module mocking
- Includes `MockFactories` for common orchestrator mocks
- ~265 lines of helper code

**Planned Simplification**:

1. Remove orchestrator mock factories (not needed with DI)
2. Simplify to basic ESM mocking utilities
3. Add DI helper patterns
4. Reduce to `<100 lines`

### Testing Documentation

**Created**:

- `docs/atomic-tool-template.md` - Full atomic tool and test template
- `docs/adrs/adr-018-atomic-tools-architecture.md` - Architecture decision
- This document - Testing improvements tracking

**To Update**:

- `tests/README.md` - Add atomic tool testing patterns
- Tool-specific test documentation

## Metrics

### Target Metrics (from ADR-018)

| Metric           | Before  | Target | Status                        |
| ---------------- | ------- | ------ | ----------------------------- |
| Test suite time  | 850s    | `<60s` | 🟡 In Progress                |
| Timeout failures | 37+     | 0      | 🟡 In Progress                |
| Mock setup lines | 50+     | 5-10   | ✅ Achieved in migrated tools |
| Test file size   | 300-400 | 50-100 | 🟡 Varies by tool             |

### Current Progress

| Tool                      | ResearchOrch Removed | DI Added | Tests Simplified | Status   |
| ------------------------- | -------------------- | -------- | ---------------- | -------- |
| review-existing-adrs-tool | ✅                   | N/A\*    | ✅               | Complete |
| adr-suggestion-tool       | ⏳                   | ⏳       | ⏳               | Planned  |
| environment-analysis-tool | ⏳                   | ⏳       | ⏳               | Planned  |

\* N/A: Tool doesn't need DI as it uses direct utility calls

## Testing Best Practices

### For New Tools

1. **Use Dependency Injection**

   ```typescript
   export async function myTool(args, deps = {}) {
     const utils = deps.utils ?? realUtils;
     // ...
   }
   ```

2. **Simple Test Setup**

   ```typescript
   test('tool works', async () => {
     const mockDeps = { utils: { fn: jest.fn() } };
     const result = await myTool(args, mockDeps);
     expect(result).toBeDefined();
   });
   ```

3. **Avoid Orchestrators**
   - Use direct utility calls instead of ResearchOrchestrator
   - Break down complex operations into smaller functions
   - Keep tools focused and atomic

### For Existing Tools

1. **Identify Orchestrator Dependencies**

   ```bash
   grep -n "ResearchOrchestrator\|KnowledgeGraphManager" src/tools/*.ts
   ```

2. **Replace with Direct Calls**
   - Import specific utilities needed
   - Remove orchestrator instantiation
   - Simplify logic flow

3. **Update Tests**
   - Remove complex ESM mocking
   - Add simple DI mocking if needed
   - Verify tests still pass

## Validation Checklist

- [ ] All high-priority tools migrated (review, adr-suggestion, environment-analysis)
- [ ] Test suite runs in `<60 seconds`
- [ ] Zero timeout failures in CI
- [ ] Test coverage maintained at ≥85%
- [ ] esm-mock-helper.ts simplified to `<100 lines`
- [ ] MockFactories removed (obsolete with DI)
- [ ] Documentation updated with new patterns

## Next Steps

### Phase 2 (In Progress)

- [ ] Migrate `adr-suggestion-tool.ts`
- [ ] Migrate `environment-analysis-tool.ts`
- [ ] Update tests for migrated tools

### Phase 3 (Planned)

- [ ] Simplify `esm-mock-helper.ts`
- [ ] Remove MockFactories
- [ ] Update test documentation

### Phase 4 (Validation)

- [ ] Measure test suite execution time
- [ ] Confirm zero timeout failures
- [ ] Verify test coverage
- [ ] Document improvements

## References

- **ADR-018**: [Atomic Tools Architecture](../adrs/adr-018-atomic-tools-architecture.md)
- **Template**: [Atomic Tool Template](atomic-tool-template.md)
- **ADR-005**: [Testing and Quality Assurance Strategy](../adrs/adr-005-testing-and-quality-assurance-strategy.md)
- **Issue #311**: Test Infrastructure Improvements (parent EPIC)

## Success Metrics (To Be Updated)

### Test Execution Time

- **Baseline**: 850+ seconds
- **Current**: TBD (measure after migrations complete)
- **Target**: `<60 seconds`

### Timeout Failures

- **Baseline**: 37+ failures
- **Current**: TBD (measure after migrations complete)
- **Target**: 0 failures

### Code Quality

- **Mock Setup Reduction**: 50+ lines → 5-10 lines ✅ (in migrated tools)
- **Test File Size**: 300-400 lines → varies (depends on tool complexity)
- **Test Maintainability**: Improved with simpler DI patterns ✅

## Lessons Learned

### What Worked Well

1. **Removing Orchestrators**: Dramatically simplified tool logic
2. **Static Contexts**: Replaced blocking calls with static information
3. **Separation of Concerns**: Tools now have single, clear responsibilities
4. **Documentation First**: ADR-018 and template provided clear guidance

### Challenges

1. **Hook Dependencies**: Pre-commit/pre-push hooks require gitleaks (not available in all environments)
2. **Test Environment**: Some tests need actual file system for accurate validation
3. **Balancing Coverage**: Need to maintain high coverage while simplifying tests

### Recommendations

1. **Incremental Migration**: Migrate tools one at a time, validate each
2. **Preserve Functionality**: Ensure tools maintain all original capabilities
3. **Document Changes**: Clear migration notes for each tool
4. **Measure Impact**: Track test execution time improvements
