name: ‘step-03b-subagent-isolation’ description: ‘Subagent: Check test isolation (no shared state/dependencies)’ subagent: true

outputFile: ‘/tmp/tea-test-review-isolation-{{timestamp}}.json’

Subagent 3B: Isolation Quality Check

SUBAGENT CONTEXT

This is an isolated subagent running in parallel with other quality dimension checks.

Your task: Analyze test files for ISOLATION violations only.

MANDATORY EXECUTION RULES

✅ Check ISOLATION only (not other quality dimensions)
✅ Output structured JSON to temp file
❌ Do NOT check determinism, maintainability, coverage, or performance
❌ Do NOT modify test files (read-only analysis)

SUBAGENT TASK

1. Identify Isolation Violations

Scan test files for isolation issues:

HIGH SEVERITY Violations:

Global state mutations (global variables modified)
Test order dependencies (test B depends on test A running first)
Shared database records without cleanup
beforeAll/afterAll with side effects leaking to other tests

MEDIUM SEVERITY Violations:

Missing test cleanup (created data not deleted)
Shared fixtures that mutate state
Tests that assume specific execution order
Environment variables modified without restoration

LOW SEVERITY Violations:

Tests sharing test data (but not mutating)
Missing test.describe grouping
Tests that could be more isolated

2. Calculate Isolation Score

const totalChecks = testFiles.length * checksPerFile;
const failedChecks = violations.length;
const severityWeights = { HIGH: 10, MEDIUM: 5, LOW: 2 };
const totalPenalty = violations.reduce((sum, v) => sum + severityWeights[v.severity], 0);
const score = Math.max(0, 100 - totalPenalty);

OUTPUT FORMAT

{
  "dimension": "isolation",
  "score": 90,
  "max_score": 100,
  "grade": "A-",
  "violations": [
    {
      "file": "tests/api/integration.spec.ts",
      "line": 15,
      "severity": "HIGH",
      "category": "test-order-dependency",
      "description": "Test depends on previous test creating user record",
      "suggestion": "Each test should create its own test data in beforeEach",
      "code_snippet": "test('should update user', async () => { /* assumes user exists */ });"
    }
  ],
  "passed_checks": 14,
  "failed_checks": 1,
  "total_checks": 15,
  "violation_summary": {
    "HIGH": 1,
    "MEDIUM": 0,
    "LOW": 0
  },
  "recommendations": [
    "Add beforeEach hooks to create test data",
    "Add afterEach hooks to cleanup created records",
    "Use test.describe.configure({ mode: 'parallel' }) to enforce isolation"
  ],
  "summary": "Tests are well isolated with 1 HIGH severity violation"
}

EXIT CONDITION

Subagent completes when:

✅ All test files analyzed for isolation violations
✅ Score calculated
✅ JSON output written to temp file

Subagent terminates here.

🚨 SUBAGENT SUCCESS METRICS

✅ SUCCESS:

Only isolation checked (not other dimensions)
JSON output valid and complete

❌ FAILURE:

Checked quality dimensions other than isolation
Invalid or missing JSON output

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