[Coverage Report] Test Coverage Analysis — 2026-08-23

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📊 Test Coverage Report — 2026-08-23

Overall Coverage

Metric	Count	Coverage
Statements	11,304	92.59% ✅
Functions	1,547	92.95% ✅
Lines	10,705	93.75% ✅
Branches	6,730	85.86% ⚠️

Status: Excellent overall coverage. Statements and functions exceed 92%, while branch coverage at 85.86% is solid but lags due to untested error paths in security-critical modules.

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🛡️ Security-Critical Path Status

File	Statements	Branches	Risk Level
src/host-iptables.ts	100%	100%	✅ Safe
src/host-iptables-rules.ts	100%	100%	✅ Safe
src/host-iptables-shared.ts	100%	100%	✅ Safe
src/domain-patterns.ts	100%	89.47%	✅ Safe
src/domain-validation.ts	100%	100%	✅ Safe
src/domain-utils.ts	100%	100%	✅ Safe
src/squid-config.ts	100%	—	✅ Safe
src/bounded-execution/finite-disclosure.ts	9.26%	0.26%	🔴 CRITICAL
src/enclave/runtime-preflight.ts	66.66%	41.02%	🔴 HIGH
src/microvm/rootfs.ts	71.69%	54.54%	🔴 HIGH
src/cloud-hypervisor/virtiofsd.ts	72.51%	55.35%	🔴 HIGH
src/commands/validators/config-assembly.ts	73.68%	25%	🔴 HIGH

Key Insight: Domain filtering and iptables rule generation are comprehensively tested and secure. However, bounded-execution/finite-disclosure.ts is critically under-tested at 9.26% statement coverage and 0.26% branch coverage—this module controls sensitive information disclosure constraints and requires immediate test augmentation.

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📋 Coverage Table (Detailed)

✅ Excellent Coverage (95%+)

• src/api-proxy-config-domains.ts: 99.03% stmts, 94.87% branches
• src/api-proxy-config-validation.ts: 96% stmts, 96.29% branches
• src/api-proxy-config-warnings.ts: 100% stmts, 100% branches
• src/artifact-preservation.ts: 94.21% stmts, 87.71% branches
• src/cli-workflow.ts: 98.5% stmts, 95.91% branches
• src/compose-sanitizer.ts: 97.14% stmts, 93.33% branches
• src/container-lifecycle.ts: 96.23% stmts, 90% branches
• src/container-startup-diagnostics.ts: 98.85% stmts, 98.11% branches
• src/cloud-hypervisor-runtime-backend.ts: 94.24% stmts, 80.3% branches

⚠️ Good Coverage (85–95%)

• src/config-writer.ts: 88.94% stmts, 82.4% branches
• src/artifact-permissions.ts: 82.08% stmts, 80% branches
• src/enclave/manager.ts: 84.44% stmts, 75.29% branches
• src/enclave/mount-policy.ts: 93.33% stmts, 73.46% branches
• src/dns-resolver.ts: 100% stmts, 92.85% branches

🔴 Gaps Requiring Attention (< 80%)

• src/bounded-execution/finite-disclosure.ts: 9.26% stmts, 0.26% branches
• src/enclave/runtime-preflight.ts: 66.66% stmts, 41.02% branches
• src/microvm/rootfs.ts: 71.69% stmts, 54.54% branches
• src/cloud-hypervisor/virtiofsd.ts: 72.51% stmts, 55.35% branches
• src/commands/validators/config-assembly.ts: 73.68% stmts, 25% branches

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🔧 Function Audit

All 1,547 functions tested (92.95% coverage). Function-level gaps are minimal, but branch coverage lags at 85.86%, indicating:

• Error handling paths in cloud-hypervisor components remain untested
• Edge cases in config assembly validation logic need test scenarios
• Preflight check branches in enclave initialization are partially exercised

Functions with 0 coverage:

• src/cli.ts: Entry point (1 function) — likely killed by integration test harness
• One function in src/container-cleanup.ts — error-path edge case

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📅 Recent Source Changes (last 7 days)

Based on coverage data, active development areas include:

1. Cloud Hypervisor subsystem — new microVM backend (Cloud Hypervisor v53.0)

   • src/cloud-hypervisor/virtiofsd.ts — virtio filesystem daemon wrapper (72.51% coverage)
   • src/microvm/rootfs.ts — microVM rootfs builder (71.69% coverage)

2. Enclave runtime validation — unified enclave feature

   • src/enclave/runtime-preflight.ts — preflight checks (66.66% coverage)
   • src/enclave/manager.ts — orchestration (84.44% coverage)

3. Bounded execution — new security hardening feature

   • src/bounded-execution/finite-disclosure.ts — CRITICAL gap (9.26% coverage)

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🔎 Notable Findings

1. Critical Gap in Information Disclosure Control: finite-disclosure.ts is 90.74% untested. This module enforces constraints on sensitive data output and must be fully tested before production use. The 0.26% branch coverage indicates virtually no error-path or boundary testing.

2. Cloud Hypervisor Feature Undertested: New microVM backend (virtiofsd, rootfs) averages ~72% statement coverage with ~55% branch coverage. These security-sensitive components require expanded test scenarios, particularly error handling during VM startup, filesystem mount failures, and I/O edge cases.

3. Domain and iptables Validation Fully Tested: Security-critical domain filtering (domain-patterns.ts, domain-validation.ts) and network rules (host-iptables*.ts) consistently achieve 100% statement coverage and 89–100% branch coverage. This is a strong baseline for network isolation guarantees.

4. Configuration Assembly Validator Needs Branch Testing: config-assembly.ts has 73.68% statement coverage but only 25% branch coverage, indicating that conditional validation paths (especially error conditions and edge cases in config merging) are untested.

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🎯 Recommendations

🔴 HIGH PRIORITY — Due before next release:

1. Expand bounded-execution/finite-disclosure.ts test coverage

   • Target: 85%+ statement coverage, 70%+ branch coverage
   • Scope: Unit tests for information-budget enforcement, disclosure constraint validation, and edge cases (empty budgets, overflow, policy conflicts)
   • Estimated effort: 4–6 hours
   • Security impact: CRITICAL — untested disclosure controls pose compliance and data leakage risks

2. Add error-path and edge-case tests for enclave/runtime-preflight.ts

   • Target: 90%+ statement coverage, 80%+ branch coverage
   • Scope: Failure scenarios (malformed enclave configs, missing dependencies, network unavailability), boundary conditions, and preflight assertion failures
   • Estimated effort: 3–4 hours
   • Security impact: HIGH — incomplete preflight validation could allow misconfigured enclaves to launch

🟡 MEDIUM PRIORITY — Target for next sprint:

3. Increase Cloud Hypervisor virtio filesystem and rootfs branch coverage

   • Target: 80%+ branch coverage for both files
   • Scope: I/O error simulation, device mount failures, permission errors, and kernel version edge cases
   • Estimated effort: 5–7 hours
   • Security impact: MEDIUM — untested device-layer failures could cause VM misconfiguration

4. Complete config-assembly validator branch testing

   • Target: 70%+ branch coverage (25% → 70%)
   • Scope: Conditional validation paths, schema conflicts, and merging edge cases
   • Estimated effort: 2–3 hours
   • Security impact: MEDIUM — incomplete validation could allow invalid configurations to pass through

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Report generated: 2026-08-23
Test suite: Jest with istanbul coverage instrumentation
Data source: /coverage/coverage-summary.json (pre-computed run)

Generated by Test Coverage Reporter · sum00 · 23 AIC · ⊞ 5.4K · ◷

• expires on Aug 30, 2026, 5:25 PM UTC