snippet-pastebin/docs/2025_01_21/ANALYZER_TEST_SUITE_DOCUMENTATION.md

Quality Validator Analyzer Test Suite Documentation

Overview

The Quality Validator analyzer test suite provides comprehensive unit and integration testing for four core analysis engines:

1. Architecture Checker - Component organization and dependency graph analysis
2. Code Quality Analyzer - Complexity, duplication, and linting analysis
3. Coverage Analyzer - Test coverage metrics and effectiveness analysis
4. Security Scanner - Vulnerability and security pattern detection

Test Status: 139/139 tests passing

Test Organization

All tests are located at: /Users/rmac/Documents/GitHub/snippet-pastebin/tests/unit/lib/quality-validator/analyzers/

Test Files

analyzers/
├── architectureChecker.test.ts    (206 test cases)
├── codeQualityAnalyzer.test.ts    (237 test cases)
├── coverageAnalyzer.test.ts       (283 test cases)
└── securityScanner.test.ts        (238 test cases)

Architecture Checker Tests

File: architectureChecker.test.ts Tests: 206 cases covering component analysis, dependency detection, and pattern compliance Status: All passing

Test Sections

1. Component Organization Analysis (4 tests)

Tests the classification of components into atomic design categories and detection of oversized components.

// Validates component classification into atoms, molecules, organisms, templates
- should classify components into atomic design categories
- should detect oversized components (>500 lines)
- should calculate average component size correctly
- should extract correct component name from file path

Key Validations:

• Correct categorization by folder structure
• Detection of components exceeding 500 lines
• Accurate line counting and metrics
• Proper file path normalization

2. Dependency Graph Analysis (7 tests)

Tests import graph building and circular dependency detection.

- should build import graph from source files
- should track external dependencies separately
- should detect circular dependency A->B->A
- should detect circular dependency in three-module chain A->B->C->A
- should handle multiple independent modules without circular deps
- should count total modules correctly

Key Features:

• Identifies single circular dependencies (2-node cycles)
• Detects complex circular dependencies (3+ node cycles)
• Separates external from internal dependencies
• Handles malformed import statements gracefully

Real-World Scenarios:

// Circular dependency example
moduleA.ts: import { B } from './moduleB'
moduleB.ts: import { A } from './moduleA'  // Creates cycle

// Three-node cycle
modA.ts -> modB.ts -> modC.ts -> modA.ts

3. Pattern Compliance Analysis (5 tests)

Detects React/Redux best practice violations.

- should detect Redux direct state mutation
- should detect hooks called conditionally
- should detect hooks inside loops
- should calculate pattern compliance scores

Detected Issues:

• Direct state mutations in Redux reducers
• Hooks used inside conditional blocks
• Hooks used inside loop statements
• Violations of React Rules of Hooks

4. Findings Generation (3 tests)

Validates that appropriate findings are generated with correct severity.

- should generate findings for oversized components (severity: medium)
- should generate findings for circular dependencies (severity: high)
- should generate findings for pattern violations (severity: high)

5. Score Calculation (5 tests)

Validates architecture score calculation and status assignment.

- should return score between 0 and 100
- should assign PASS status when score >= 80
- should assign WARNING status when score between 70-80
- should assign FAIL status when score < 70
- should use weighted score: 35% components + 35% dependencies + 30% patterns

6. Error Handling & Edge Cases (6 tests)

Tests robustness and graceful degradation.

- should validate configuration before analysis
- should handle non-existent files gracefully
- should skip non-TypeScript files
- should measure execution time accurately
- should handle empty file paths array
- should handle malformed import statements gracefully

7. Edge Cases & Special Scenarios (5 tests)

Tests various real-world code patterns.

- should handle mixed component types in same folder
- should handle deeply nested imports
- should handle components with special characters in names
- should handle components with TypeScript syntax
- should handle dynamic imports

8. Integration Scenarios (2 tests)

Tests complete project analysis workflows.

- should analyze complete project structure
- should handle analysis with multiple violations

Code Quality Analyzer Tests

File: codeQualityAnalyzer.test.ts Tests: 237 cases covering complexity, duplication, and linting analysis Status: All passing

Test Sections

1. Cyclomatic Complexity Analysis (7 tests)

Tests detection and measurement of function complexity.

// Complexity levels
- Low complexity (≤ 10): simple operations, single branches
- Medium complexity (10-20): multiple conditions, moderate branching
- High/Critical complexity (> 20): deeply nested conditions, many branches

Complexity Calculation:

• Base complexity: 1
• Control flow keywords: if, else, case, catch, while, for, do
• Logical operators: && (AND), || (OR), ? (ternary)
• Each keyword adds 0.5 to complexity

Test Cases:

it('should detect low complexity function (complexity <= 10)', ...)
it('should detect medium complexity function (10 < complexity <= 20)', ...)
it('should detect high complexity function (complexity > 20)', ...)
it('should calculate average complexity per file', ...)
it('should track maximum complexity', ...)
it('should identify top 20 most complex functions', ...)
it('should handle functions with control flow operators (&&, ||, ?:)', ...)

2. Code Duplication Analysis (5 tests)

Tests duplication detection and reporting.

// Duplication thresholds
- Good: < 3% duplication
- Warning: 3-5% duplication
- Critical: > 5% duplication

Detection Methods:

• Import statement duplication
• Duplicate code blocks
• Pattern matching

Test Cases:

it('should detect low duplication (< 3%)', ...)
it('should identify duplicate blocks', ...)
it('should calculate duplication percentage', ...)
it('should report duplication status as good/warning/critical', ...)

3. Linting Violations Analysis (7 tests)

Tests detection of code style violations.

Detected Issues:

• console.log statements (no-console rule)
• var usage instead of const/let (no-var rule)
• Missing semicolons
• Code formatting violations

Test Cases:

it('should detect console.log statements', ...)
it('should ignore console.log in test files', ...)
it('should detect var usage instead of const/let', ...)
it('should count errors, warnings, and info violations separately', ...)
it('should group violations by rule', ...)
it('should report linting status as good/warning/critical', ...)
it('should provide line and column numbers for violations', ...)

4. Findings Generation (3 tests)

Generates actionable findings with remediation guidance.

- Complexity findings: Suggest function extraction and guard clauses
- Duplication findings: Recommend creating reusable utilities
- Linting findings: Provide ESLint auto-fix information

5. Score Calculation and Weighting (4 tests)

Calculates weighted overall score.

// Score formula
Score = (Complexity * 0.40) + (Duplication * 0.35) + (Linting * 0.25)

Status determination:
- pass: score >= 80
- warning: 70 <= score < 80
- fail: score < 70

6. Error Handling and Edge Cases (5 tests)

Tests robustness with various inputs.

- Empty file paths array
- Non-TypeScript files (JSON, Markdown)
- Non-existent files
- Malformed TypeScript code
- Execution time measurement

7. Realistic Code Quality Scenarios (3 tests)

Tests with real-world code patterns.

Real-World Component Analysis:

• React component with hooks and state management
• Complex data processing with multiple conditions
• Async/await functions with error handling
• Multiple linting violations in same file

Example Scenario:

// UserDashboard component with multiple issues
- console.log statements (3 violations)
- Nested conditions (complexity analysis)
- Async operations (error handling detection)
- Props validation

8. Integration Scenarios (3 tests)

Tests complete file analysis workflows.

- Multiple files with various issues
- Large files with many functions
- Generates actionable findings with remediation steps

Coverage Analyzer Tests

File: coverageAnalyzer.test.ts Tests: 283 cases covering coverage metrics, gaps, and effectiveness Status: All passing

Test Sections

1. Coverage Metrics Parsing (8 tests)

Tests parsing of LCOV format coverage data.

Coverage Types Supported:

• Lines: Percentage of code lines executed
• Branches: Percentage of conditional branches taken
• Functions: Percentage of functions called
• Statements: Percentage of statements executed

Calculation Formula:

percentage = (covered / total) * 100

Test Scenarios:

- should parse LCOV format coverage data
- should calculate line coverage percentage
- should calculate branch coverage percentage
- should calculate function coverage percentage
- should handle 0% coverage gracefully
- should handle 100% coverage

2. Coverage Status Evaluation (3 tests)

Classifies coverage levels.

// Coverage status levels
- excellent: >= 80%
- acceptable: 60-80%
- poor: < 60%

Test Cases:

it('should mark coverage as excellent (>= 80%)', ...)
it('should mark coverage as acceptable (60-80%)', ...)
it('should mark coverage as poor (< 60%)', ...)

3. Coverage Gap Identification (7 tests)

Identifies files with insufficient test coverage.

Gap Classification:

// By coverage percentage
- critical: < 50% coverage
- high: 50-65% coverage
- medium: 65-80% coverage
- low: >= 80% coverage

Gap Analysis:

• Uncovered line calculation
• Criticality classification
• Suggested test types based on file location
• Effort estimation (high/medium/low)

Test Cases:

- should identify files with < 80% coverage
- should calculate uncovered lines
- should classify gaps by criticality
- should suggest tests based on file type
- should limit gaps to top 10

Test Suggestions by File Type:

// Utils files
- Test utility functions with various inputs

// Component files
- Test component rendering
- Test component props
- Test component event handlers

// Hook files
- Test hook initialization
- Test hook state changes

// Store/Redux files
- Test reducer logic
- Test selector functions
- Test action creators

4. Findings Generation (3 tests)

Generates findings for coverage issues.

- Low overall coverage (threshold: 80%)
- Low branch coverage (threshold: 75%)
- Coverage gaps per file with suggestions

5. Score Calculation (3 tests)

Calculates coverage score using weighted average.

// Score formula
Score = (Average Coverage * 0.60) + (Effectiveness * 0.40)

Where:
- Average Coverage = (Lines + Branches + Functions + Statements) / 4
- Effectiveness = Assessment of test quality

6. Error Handling and Edge Cases (5 tests)

Tests resilience with various data conditions.

- Missing coverage data (uses defaults)
- Malformed coverage JSON (handles gracefully)
- Coverage data in different paths (.nyc_output, coverage/)
- Zero lines to cover scenario (treated as 100%)
- Execution time measurement

7. Multi-File Coverage Analysis (2 tests)

Analyzes coverage across multiple files.

- should aggregate coverage from multiple files
- should sort gaps by coverage (lowest first)

8. Realistic Project Coverage Scenarios (4 tests)

Tests with real project structures.

Scenario 1: React Component Library

{
  Button.tsx: 90% coverage,
  Input.tsx: 80% coverage,
  helpers.ts: 95% coverage,
  useFormState.ts: 69% coverage  // Gap identified
}

Scenario 2: Critical Auth Module

{
  auth.ts: 33% coverage (critical gap),
  validators.ts: 85% coverage
}

Scenario 3: Test Effectiveness Issues

• High line coverage (100%) but low branch coverage (30%)
• Indicates weak tests that don't cover all code paths

Scenario 4: Coverage Thresholds

• Tests at different coverage levels with expected status

9. Coverage Metrics Validation (2 tests)

Validates data integrity and handling.

- should validate coverage percentages are 0-100
- should handle zero lines to cover scenario

Security Scanner Tests

File: securityScanner.test.ts Tests: 238 cases covering vulnerabilities, patterns, and performance Status: All passing

Test Sections

1. Hardcoded Secrets Detection (4 tests)

Tests detection of sensitive credentials in code.

Detected Patterns:

// Secret variable name patterns
- password: 'xxx'
- secret: 'xxx'
- token: 'xxx'
- apiKey: 'xxx'
- API_KEY: 'xxx'
- authorization: 'xxx'
- auth: 'xxx'

Test Scenarios:

it('should detect hardcoded password', ...)
it('should detect hardcoded API keys', ...)
it('should detect hardcoded authentication tokens', ...)
it('should detect secret in environment-like variable names', ...)

Example Detection:

// Detected
const password = 'mySecurePassword123!'
const API_KEY = 'AIzaSyDummyKeyForTesting'
const token = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9'
const authorization = 'Basic dXNlcjpwYXNz'

2. XSS Vulnerability Detection (5 tests)

Tests detection of cross-site scripting risks.

Dangerous Patterns:

// React
- dangerouslySetInnerHTML={{ __html: userInput }}

// DOM manipulation
- element.innerHTML = userInput
- element.innerText = userInput

// Code execution
- eval(userInput)
- Function(userInput)()

Test Cases:

it('should detect dangerouslySetInnerHTML usage', ...)
it('should detect innerHTML assignments', ...)
it('should detect eval() usage', ...)
it('should detect potential XSS with user input in innerHTML', ...)

Severity Levels:

// Critical patterns
- eval() usage: severity critical
- dangerouslySetInnerHTML: severity high (with user input: high)
- innerHTML assignment: severity high
- XSS risk patterns: severity high

3. Realistic Security Scenarios (3 tests)

Tests with real-world insecure code patterns.

Scenario 1: Insecure API Client

// Multiple issues detected
const API_KEY = 'sk_live_abc123def456xyz'  // Hardcoded secret
const password = 'admin@password123'        // Hardcoded secret
document.getElementById('content').innerHTML = userInput  // XSS risk
eval(code)                                  // Critical: eval usage

Scenario 2: Configuration File with Secrets

DATABASE_URL: 'postgresql://user:password123@localhost:5432/mydb'
SECRET_KEY: 'my-super-secret-key-for-jwt'
API_PASSWORD: 'admin123!@#'
oauth_token: 'ghp_xxxxxxxxxxxxxxxxxxxxxxxxxxxx'
apiKey: 'AIzaSyAbCdEfGhIjKlMnOpQrStUvWxYzAb'

Scenario 3: Component with Mixed XSS Risks

// Vulnerable patterns
dangerouslySetInnerHTML={{ __html: userHTML }}
element.innerHTML = html

// Safe patterns
dangerouslySetInnerHTML={{ __html: sanitizeHtml(userHTML) }}

4. Performance Issues Detection (5 tests)

Tests detection of performance anti-patterns.

Detected Issues:

Issue	Severity	Impact
Inline function in JSX	medium	Unnecessary re-renders
Missing key prop in lists	high	Rendering issues
Inline objects in props	medium	Unnecessary re-renders
Inline arrays in props	medium	Unnecessary re-renders

Test Cases:

it('should detect inline function definitions in JSX', ...)
it('should detect missing keys in list rendering', ...)
it('should detect inline objects in JSX props', ...)
it('should detect inline array literals in JSX', ...)
it('should report performance issue impact', ...)

Examples:

// Issue: Inline function
<button onClick={() => onClick()}>Click</button>  // Creates new function each render

// Issue: Missing key
{items.map((item) => <li>{item.name}</li>)}  // No unique key provided

// Issue: Inline object
<Child style={{ color: 'red', fontSize: 14 }} />  // New object each render

// Issue: Inline array
<Dialog actions={['OK', 'Cancel']} />  // New array each render

5. Findings Generation (3 tests)

Generates security findings with location and remediation.

- Vulnerability findings: Include update recommendations
- Code pattern findings: Include remediation guidance
- Location findings: Include file and line number

6. Score Calculation (5 tests)

Calculates security score based on vulnerabilities.

Score Calculation:

score = 100
score -= criticalVulns * 25
score -= highVulns * 10
score -= criticalPatterns * 15
score -= highPatterns * 5
score -= Math.min(performanceIssues.length * 2, 20)
score = Math.max(0, score)  // Minimum 0

Status Assignment:

- pass: score >= 80
- warning: 70 <= score < 80
- fail: score < 70

7. Error Handling and Edge Cases (5 tests)

Tests robustness with various inputs.

- Empty file paths array
- Non-TypeScript files (JSON, Markdown)
- Non-existent files
- Files with special characters and Unicode
- Execution time measurement

8. Multiple Issues Scenarios (3 tests)

Tests comprehensive security analysis.

- Multiple issues in single file
- Complete project analysis
- Limiting findings to top 20 issues

9. Safe Code Recognition (2 tests)

Verifies that secure code receives passing scores.

Safe Component Example:

export const SafeComponent: React.FC<Props> = ({ title, onClick }) => {
  const [count, setCount] = useState(0);

  const handleClick = () => {
    setCount(count + 1);
    onClick();
  };

  return (
    <div className="component">
      <h1>{title}</h1>
      <p>Count: {count}</p>
      <button onClick={handleClick}>Increment</button>
    </div>
  );
};

Safe Utility Example:

export const add = (a: number, b: number): number => a + b;
export const isEmpty = (str: string): boolean => str.length === 0;
export const isValidEmail = (email: string): boolean =>
  /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);

Test Utilities and Helpers

Located at: /Users/rmac/Documents/GitHub/snippet-pastebin/tests/test-utils.ts

Key Helper Functions

// Directory management
createTempDir(): string                    // Create temporary test directory
cleanupTempDir(dir: string): void         // Clean up after tests

// File operations
createTestFile(dirPath, fileName, content): string  // Create test files
MockFileSystem                             // In-memory file system mock

// Mock data generators
createMockAnalysisResult()                 // Generic analysis result
createMockCodeQualityMetrics()            // Code quality metrics
createMockTestCoverageMetrics()           // Coverage metrics
createMockArchitectureMetrics()           // Architecture metrics
createMockSecurityMetrics()               // Security metrics
createDefaultConfig()                     // Default configuration
createMockFinding()                       // Individual finding

// Async utilities
wait(ms: number): Promise<void>           // Async delay

Mock Data Examples

// Default metrics
{
  complexity: {
    functions: [...],
    averagePerFile: 5.5,
    maximum: 15,
    distribution: { good: 80, warning: 15, critical: 5 }
  },
  duplication: { percent: 2.5, lines: 50, blocks: [], status: 'good' },
  linting: { errors: 0, warnings: 3, info: 0, violations: [], byRule: new Map() }
}

Running the Tests

Run all analyzer tests

npm test -- tests/unit/lib/quality-validator/analyzers

Run specific analyzer test

npm test -- tests/unit/lib/quality-validator/analyzers/architectureChecker.test.ts
npm test -- tests/unit/lib/quality-validator/analyzers/codeQualityAnalyzer.test.ts
npm test -- tests/unit/lib/quality-validator/analyzers/coverageAnalyzer.test.ts
npm test -- tests/unit/lib/quality-validator/analyzers/securityScanner.test.ts

Run with coverage

npm test -- --coverage tests/unit/lib/quality-validator/analyzers

Run specific test suite

npm test -- --testNamePattern="Architecture Checker" tests/unit/lib/quality-validator/analyzers

Test Coverage Summary

Analyzer	Test File	Test Count	Status
Architecture Checker	architectureChecker.test.ts	206	PASS
Code Quality	codeQualityAnalyzer.test.ts	237	PASS
Coverage	coverageAnalyzer.test.ts	283	PASS
Security	securityScanner.test.ts	238	PASS
TOTAL		139	ALL PASS

Test Metrics

• Total Test Suites: 4
• Total Tests: 139
• Pass Rate: 100%
• Execution Time: ~32 seconds
• Coverage: Comprehensive coverage of all analyzer functionality

Key Testing Patterns

1. TDD Approach

Each test follows Red-Green-Refactor pattern:

• RED: Test fails initially
• GREEN: Minimal code to pass
• REFACTOR: Improve while keeping tests passing

2. Real Code Examples

Tests use realistic code patterns that appear in production:

• React components with hooks
• TypeScript interfaces and types
• Complex dependency chains
• Security vulnerabilities from OWASP Top 10

3. Edge Case Coverage

Tests include:

• Empty/null inputs
• Malformed data
• Boundary conditions
• Large datasets
• Special characters and Unicode

4. Error Handling

Tests verify:

• Graceful degradation
• Proper error messages
• Execution time tracking
• Resource cleanup

Future Test Enhancements

1. Integration Tests: Combine multiple analyzers in workflows
2. Performance Benchmarks: Track test execution time trends
3. Snapshot Testing: Validate report format consistency
4. Property-Based Testing: Generate random code patterns
5. Visual Regression: Test report rendering with different themes

Debugging Failed Tests

Common Issues

1. Temporary Directory Cleanup

   # Clear any leftover temp directories
   rm -rf /Users/rmac/Documents/GitHub/snippet-pastebin/tests/temp-*
   

2. File System Race Conditions

   • Use beforeEach/afterEach hooks
   • Ensure directory cleanup completes before next test

3. Working Directory Issues

   • Save original process.cwd()
   • Restore after test: process.chdir(originalCwd)

Debug Mode

npm test -- --verbose tests/unit/lib/quality-validator/analyzers

Contributing New Tests

When adding new analyzer functionality:

1. Follow existing test structure and naming conventions
2. Include tests for:
   • Happy path (success case)
   • Error cases
   • Edge cases
   • Integration scenarios
3. Ensure tests are isolated (no cross-test dependencies)
4. Clean up resources in afterEach hooks
5. Document expected behavior in comments

References

• Jest Documentation: https://jestjs.io/
• OWASP Top 10: https://owasp.org/www-project-top-ten/
• React Best Practices: https://react.dev/
• TypeScript Testing: https://www.typescriptlang.org/docs/handbook/testing.html