QE Coverage Analysis

Purpose

Guide the use of v3's advanced coverage analysis capabilities including sublinear gap detection algorithms, risk-weighted coverage scoring, and intelligent test prioritization based on code criticality.

Activation

• When analyzing test coverage

• When identifying coverage gaps

• When prioritizing testing effort

• When setting coverage targets

• When assessing code risk

Quick Start

Analyze coverage with gap detection

aqe coverage analyze --source src/ --tests tests/

Find high-risk uncovered code

aqe coverage gaps --risk-weighted --threshold 80

Generate coverage report

aqe coverage report --format html --output coverage-report/

Compare coverage between branches

aqe coverage diff --base main --head feature-branch

Agent Workflow

// Comprehensive coverage analysis Task("Analyze coverage gaps", ` Perform O(log n) coverage analysis on src/:

• Calculate statement, branch, function coverage
• Identify uncovered critical paths
• Risk-weight gaps by code complexity and change frequency
• Recommend tests to write for maximum coverage impact `, "qe-coverage-specialist")

// Risk-based prioritization Task("Prioritize coverage effort", ` Analyze coverage gaps and prioritize by:

• Business criticality (payment, auth, data)
• Code complexity (cyclomatic > 10)
• Recent bug history
• Change frequency Output prioritized list of files needing tests. `, "qe-coverage-analyzer")

Analysis Strategies

1. Sublinear Gap Detection

await coverageAnalyzer.detectGaps({ algorithm: 'sublinear', // O(log n) complexity source: 'src/**/*.ts', metrics: ['statement', 'branch', 'function'], sampling: { enabled: true, confidence: 0.95, maxSamples: 1000 } });

2. Risk-Weighted Coverage

await coverageAnalyzer.riskWeightedAnalysis({ coverage: coverageReport, riskFactors: { complexity: { weight: 0.3, threshold: 10 }, changeFrequency: { weight: 0.25, window: '90d' }, bugHistory: { weight: 0.25, window: '180d' }, criticality: { weight: 0.2, tags: ['payment', 'auth'] } }, output: { riskScore: true, prioritizedGaps: true } });

3. Differential Coverage

await coverageAnalyzer.diffCoverage({ base: 'main', head: 'feature-branch', requirements: { newCode: 80, // New code must have 80% coverage modifiedCode: 'maintain', // Don't decrease existing deletedCode: 'ignore' } });

Coverage Thresholds

thresholds: global: statements: 80 branches: 75 functions: 85 lines: 80

per_file: min_statements: 70 critical_paths: 90

new_code: statements: 85 branches: 80

exceptions: - path: "src/migrations/" reason: "Database migrations" - path: "src/generated/" reason: "Auto-generated code"

Coverage Report

interface CoverageAnalysis { summary: { statements: { covered: number; total: number; percentage: number }; branches: { covered: number; total: number; percentage: number }; functions: { covered: number; total: number; percentage: number }; }; gaps: { file: string; uncoveredLines: number[]; uncoveredBranches: BranchInfo[]; riskScore: number; suggestedTests: string[]; }[]; trends: { period: string; coverageChange: number; newGaps: number; closedGaps: number; }; recommendations: { priority: 'critical' | 'high' | 'medium' | 'low'; file: string; action: string; expectedImpact: number; }[]; }

Quality Gates

quality_gates: coverage: block_merge: - new_code_coverage < 80 - coverage_regression > 5 - critical_path_uncovered

warn:
  - overall_coverage < 75
  - branch_coverage < 70

metrics:
  - track_trends: true
  - alert_on_decline: 3  # consecutive PRs

Coordination

Primary Agents: qe-coverage-specialist, qe-coverage-analyzer, qe-gap-detector Coordinator: qe-coverage-coordinator Related Skills: qe-test-generation, qe-quality-assessment