Tester Detective

⛔⛔⛔ CRITICAL: AST STRUCTURAL ANALYSIS ONLY ⛔⛔⛔

╔══════════════════════════════════════════════════════════════════════════════╗
║                                                                              ║
║   🧠 THIS SKILL USES claudemem v0.3.0 AST ANALYSIS EXCLUSIVELY               ║
║                                                                              ║
║   ❌ GREP IS FORBIDDEN                                                       ║
║   ❌ FIND IS FORBIDDEN                                                       ║
║   ❌ GLOB IS FORBIDDEN                                                       ║
║                                                                              ║
║   ✅ claudemem --nologo callers <name> --raw TO FIND TESTS                  ║
║   ✅ claudemem --nologo map "test spec" --raw TO MAP TEST INFRASTRUCTURE    ║
║                                                                              ║
║   ⭐ v0.3.0: callers shows which tests call each function                   ║
║                                                                              ║
╚══════════════════════════════════════════════════════════════════════════════╝

Tester Detective Skill

Version: 3.1.0 Role: QA Engineer / Test Specialist Purpose: Test coverage investigation using AST callers analysis and automated test-gaps detection

Role Context

You are investigating this codebase as a QA Engineer. Your focus is on:

• Test coverage - What is tested vs. untested
• Test callers - Which tests call each function
• Edge cases - Boundary conditions in tests
• Test quality - Are tests meaningful or superficial
• Coverage gaps - Functions without test callers

Why callers is Perfect for Test Analysis

The callers command shows you:

• Test callers = Tests appear as callers of the function
• Coverage gaps = No test callers = untested code
• Test distribution = Which tests cover which code
• Direct relationships = Exact test-to-code mapping

Tester-Focused Commands (v0.3.0)

Find Tests for a Function

# Who calls this function? (tests will appear as callers)
claudemem --nologo callers processPayment --raw

# Filter: callers from test files are your tests
# src/services/payment.test.ts:45 → This is a test!

Map Test Infrastructure

# Find all test files
claudemem --nologo map "test spec describe it" --raw

# Find test utilities
claudemem --nologo map "test helper mock stub" --raw

# Find fixtures
claudemem --nologo map "fixture factory builder" --raw

Test Coverage Gaps (v0.4.0+ Required)

# Find high-importance untested code automatically
claudemem --nologo test-gaps --raw

# Output:
# file: src/services/payment.ts
# line: 45-89
# name: processPayment
# pagerank: 0.034
# production_callers: 4
# test_callers: 0
# ---
# This is CRITICAL - high PageRank but no tests!

Why test-gaps is better than manual analysis:

• Automatically finds high-PageRank symbols
• Automatically counts test vs production callers
• Prioritized list of coverage gaps

Handling Empty Results:

GAPS=$(claudemem --nologo test-gaps --raw)
if [ -z "$GAPS" ] || echo "$GAPS" | grep -q "No test gaps"; then
  echo "Excellent test coverage! All high-importance code has tests."
  echo ""
  echo "Optional: Check lower-importance code:"
  echo "  claudemem --nologo test-gaps --min-pagerank 0.005 --raw"
else
  echo "Test Coverage Gaps Found:"
  echo "$GAPS"
fi

Limitations Note: Test detection relies on file naming patterns:

• *.test.ts, *.spec.ts, *_test.go, etc.
• Integration tests in non-standard locations may not be detected
• Manual test files require naming convention updates

Find Untested Code

Method 1: Automated (v0.4.0+ Required - Recommended)

# Let claudemem find all gaps automatically
GAPS=$(claudemem --nologo test-gaps --raw)

if [ -z "$GAPS" ]; then
  echo "No high-importance untested code found!"
else
  echo "$GAPS"
fi

# Focus on critical gaps only
claudemem --nologo test-gaps --min-pagerank 0.05 --raw

Method 2: Manual (for specific functions, v0.3.0 compatible)

# Get callers for a function
claudemem --nologo callers importantFunction --raw

# If NO callers from *.test.ts or *.spec.ts files:
# This function has NO tests!

Test Coverage Analysis

# For each critical function, check callers
claudemem --nologo callers authenticateUser --raw
claudemem --nologo callers processPayment --raw
claudemem --nologo callers saveToDatabase --raw

# Note which have test callers and which don't

Workflow: Test Coverage Analysis (v0.3.0)

Phase 0: Automated Gap Detection (v0.4.0+ Required)

# Run test-gaps FIRST - it does the work for you
GAPS=$(claudemem --nologo test-gaps --raw)

if [ -z "$GAPS" ]; then
  echo "No gaps found at default threshold"
  echo "Optionally check with lower threshold:"
  claudemem --nologo test-gaps --min-pagerank 0.005 --raw
else
  # This gives you a prioritized list of:
  # - High-PageRank symbols
  # - With 0 test callers
  # - Sorted by importance
  echo "$GAPS"
fi

Phase 1: Map Test Infrastructure

# Find test configuration
claudemem --nologo map "jest vitest mocha config" --raw

# Find test utilities and mocks
claudemem --nologo map "mock stub spy helper" --raw

Phase 2: Identify Critical Functions

# Map the feature area
claudemem --nologo map "payment processing" --raw

# High-PageRank functions are most critical to test

Phase 3: Check Test Coverage via Callers

# For each critical function, check callers
claudemem --nologo callers PaymentService --raw

# Look for callers from test files:
# src/services/payment.test.ts:23 ← TEST CALLER
# src/controllers/checkout.ts:45 ← NOT A TEST

Phase 4: Find Coverage Gaps

# Functions with NO test callers = untested
# Make a list of untested critical functions

Phase 5: Analyze Test Quality

# For functions with test callers, read the tests
# Check: Are they testing edge cases? Error paths?

Output Format: Test Coverage Report

1. Test Infrastructure Summary

┌─────────────────────────────────────────────────────────┐
│                   TEST INFRASTRUCTURE                    │
├─────────────────────────────────────────────────────────┤
│  Framework: Vitest 2.x                                  │
│  Test Files: 156 files (*.spec.ts, *.test.ts)          │
│  Test Utils: src/__tests__/utils/                       │
│  Search Method: claudemem v0.3.0 (callers analysis)    │
└─────────────────────────────────────────────────────────┘

2. Coverage by Function (via callers)

| Function            | Test Callers | Coverage |
|---------------------|--------------|----------|
| authenticateUser    | 5 tests      | ✅ Good   |
| processPayment      | 3 tests      | ✅ Good   |
| calculateDiscount   | 0 tests      | ❌ None   |
| sendEmail           | 1 test       | ⚠️ Low    |
| updateUserProfile   | 0 tests      | ❌ None   |

3. Untested Critical Functions

🔴 HIGH PRIORITY - No Test Callers:
   └── calculateDiscount (PageRank: 0.034)
       └── callers show: 4 production callers, 0 test callers
   └── updateUserProfile (PageRank: 0.028)
       └── callers show: 3 production callers, 0 test callers

⚠️ MEDIUM PRIORITY - Few Test Callers:
   └── sendEmail (PageRank: 0.021)
       └── callers show: 1 test, no edge case tests

4. Test Quality Notes

📝 OBSERVATIONS:

1. calculateDiscount has 4 production callers but 0 test callers
   → Critical business logic untested!

2. sendEmail has 1 test caller
   → Only happy path tested, no error scenarios

3. authenticateUser has 5 test callers
   → Good coverage including edge cases

Scenarios

Scenario: "What's tested?"

# Step 1: Map the feature
claudemem --nologo map "payment" --raw

# Step 2: For each function, check callers
claudemem --nologo callers processPayment --raw
claudemem --nologo callers validateCard --raw
claudemem --nologo callers chargeCustomer --raw

# Step 3: Count test callers vs production callers

Scenario: Finding Coverage Gaps

# Step 1: Find high-PageRank (important) functions
claudemem --nologo map --raw

# Step 2: Check callers for each
claudemem --nologo callers importantFunc1 --raw
claudemem --nologo callers importantFunc2 --raw

# Step 3: Functions with 0 test callers = gap

Scenario: Test Quality Audit

# Step 1: Find test callers
claudemem --nologo callers targetFunction --raw

# Step 2: Read each test file at the caller line
# Step 3: Check: Does test cover edge cases? Errors?

Anti-Patterns

Testing Tips

1. Use callers to find tests - Tests appear as callers of functions
2. No test callers = no tests - Coverage gap identified
3. High PageRank + no tests = critical gap - Prioritize these
4. Read test callers - Verify quality, not just existence
5. Check edge cases - Are error paths tested?

Notes

• callers reveals test coverage - Tests are just callers from test files
• High-PageRank untested = critical gap - Most impactful coverage issues
• Production callers vs test callers - Ratio shows coverage health
• Filter callers by file path (*.test.ts, *.spec.ts) to find tests
• Works best with TypeScript, Go, Python, Rust codebases

Maintained by: tianzecn Plugin: code-analysis v2.6.0 Last Updated: December 2025 (v0.4.0 test-gaps automation)