[Coverage Report] Test Coverage Analysis & Recommendations

[github-actions[bot]]

📊 Test Coverage Report — 2026-09-04

Overall Coverage

The project maintains excellent test coverage across all metrics:

Metric	Coverage	Status
Statements	92.66%	✅
Branches	86.35%	✅
Functions	93.31%	✅
Lines	94.05%	✅

Total Files Analyzed: 247 source files
Test Count: 2,080 functions with 1,941 covered

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🛡️ Security-Critical Path Status

All primary security-critical paths are fully covered (100% statement coverage):

Component	Statements	Branches	Functions	Status
src/squid-config.ts	100%	100%	100%	✅ Full coverage
src/host-iptables.ts	100%	100%	100%	✅ Full coverage
src/host-iptables-rules.ts	100%	100%	100%	✅ Full coverage
src/host-iptables-shared.ts	100%	100%	100%	✅ Full coverage
src/docker-manager.ts	100%	100%	100%	✅ Full coverage
src/domain-patterns.ts	100%	89.47%	100%	✅ Full statement coverage

Note: src/cli.ts has minimal logic (7 statements total) and is 85.71% covered due to branch handling.

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📋 Coverage Table

Files Below 80% Statement Coverage (Sorted by Risk):

File	Statements	Branches	Functions	Notes
src/bounded-execution/finite-disclosure.ts	38.12% ⚠️ CRITICAL	25.89%	55.31%	Disclosure boundary logic underutilized in tests
src/microvm/network-reservation.ts	50.22% ⚠️ HIGH	54.26%	56.81%	Network resource allocation paths need more coverage
src/enclave/runtime-preflight.ts	66.66%	41.02%	100%	Pre-flight validation checks not fully tested
src/microvm/rootfs.ts	71.69%	54.54%	100%	Root filesystem setup partially covered
src/commands/validators/config-assembly.ts	73.68%	25.00%	83.33%	Configuration validation missing branch coverage
src/enclave/github-gateway.ts	79.42%	71.12%	82.14%	GitHub gateway integration has gaps

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🔧 Function Audit

High-Risk Uncovered Functions:

1. src/bounded-execution/finite-disclosure.ts (38.12% stmts, 25.89% branches)

   • 47 functions total, only 26 covered (55.31%)
   • Multiple disclosure-boundary and compliance-checking paths lack test coverage
   • Recommendation: Add integration tests for bounded execution lifecycle

2. src/microvm/network-reservation.ts (50.22% stmts, 54.26% branches)

   • 44 functions, 25 covered (56.81%)
   • Network resource allocation and reservation validation paths need expansion
   • Recommendation: Add tests for concurrent network resource conflicts

3. src/enclave/runtime-preflight.ts (66.66% stmts, 41.02% branches)

   • Preflight checks only 66.66% covered; branches only 41.02%
   • Many edge case validations not exercised
   • Recommendation: Add error condition and boundary tests

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📅 Recent Source Changes (last 30 commits)

Recent changes to security-critical areas:

• Fix EROFS on credential-overlay mountpoints for read-only ARC/DinD home dirs — impacts container isolation
• Add fail-closed Docker sbx egress verification — validates egress control
• Bind Cloud Hypervisor artifacts to attested release manifests — microVM supply chain security
• Verify runtime confinement — runtime isolation validation
• Filter workflow commands from microVM output — command injection prevention
• Drop VMM capabilities — privilege reduction

Positive signal: Security-critical paths (iptables, squid-config, domain-patterns) remain fully covered despite active development.

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🔎 Notable Findings

1. Bounded Execution Coverage Gap (🔴 CRITICAL)

   • finite-disclosure.ts at only 38.12% statement coverage represents the single largest risk
   • The disclosure boundary—a core security mechanism—lacks sufficient test exercise
   • This module controls resource allocation and compliance checking in bounded execution contexts

2. MicroVM Network Reservation Vulnerability (🟡 HIGH)

   • Network resource reservation and allocation logic is only 50% covered
   • Concurrent reservation conflicts and edge cases are not well tested
   • Risk: Race conditions or resource exhaustion attacks may not be caught

3. Enclave Runtime Preflight Under-tested (🟡 MEDIUM)

   • Preflight checks are only 66.66% covered with only 41% branch coverage
   • Pre-flight validation is critical for sandboxing and runtime isolation

4. Container Security Fully Covered (✅ EXCELLENT)

   • All core security paths (iptables rules, squid ACLs, domain filtering) are 100% covered
   • This represents mature test coverage for the foundational firewall

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🎯 Recommendations

1. HIGH PRIORITY: Expand Bounded Execution Coverage (🔴 CRITICAL)

• Target: src/bounded-execution/finite-disclosure.ts (currently 38.12%)
• Action: Add integration tests for:
  • Disclosure boundary enforcement across resource-exhaustion scenarios
  • Compliance checking under concurrent execution
  • Error handling when disclosure limits are breached
• Estimated Impact: Reduces critical gap from 38% → 75%+
• Timeline: 1–2 sprints

2. HIGH PRIORITY: Add Network Reservation Conflict Tests (🟡 HIGH)

• Target: src/microvm/network-reservation.ts (currently 50.22%)
• Action: Add tests for:
  • Concurrent network resource allocation
  • Conflict detection and resolution
  • Edge cases when subnet pools are exhausted
  • Rollback scenarios on failure
• Estimated Impact: Increases coverage to 75%+
• Timeline: 1 sprint

3. MEDIUM PRIORITY: Enhance Enclave Preflight Validation Tests (🟡 MEDIUM)

• Target: src/enclave/runtime-preflight.ts (currently 66.66% stmts, 41.02% branches)
• Action: Add tests for:
  • Missing or invalid enclave configuration
  • Resource constraint validation
  • Permission and capability edge cases
• Estimated Impact: Increases coverage to 85%+
• Timeline: 1 sprint

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Summary

The firewall maintains industry-leading test coverage with all primary security paths (iptables, squid ACLs, container isolation) at 100%. However, three emerging modules—bounded execution, microVM networking, and enclave runtime—require urgent attention to match the project's security standards. Prioritizing the recommendations above will eliminate coverage gaps in security-sensitive paths and reduce the risk surface.

Next Steps:

• File issues for bounded execution coverage expansion
• Schedule network reservation conflict testing
• Review enclave preflight edge cases
• Establish coverage floor at 80% for all new modules

Generated by Test Coverage Reporter · copilot · sum00 · 30.3 AIC · ⊞ 5.4K · ◷

• expires on Sep 11, 2026, 4:40 PM UTC