Imported from majiayu000/claude-skill-registry-data (testing/tester-detective/SKILL.md). Install upstream with npx skills add majiayu000/claude-skill-registry-data --skill tester-detective. Copyright stays with the author.

⛔⛔⛔ 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 --agent callers <name> TO FIND TESTS                  ║
║   ✅ claudemem --agent map "test spec" TO MAP TEST INFRASTRUCTURE    ║
║                                                                              ║
║   ⭐ v0.3.0: callers shows which tests call each function                   ║
║                                                                              ║
╚══════════════════════════════════════════════════════════════════════════════╝

Tester Detective Skill

Version: 3.3.0 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 --agent callers processPayment
# 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 --agent map "test spec describe it"
# Find test utilities
claudemem --agent map "test helper mock stub"
# Find fixtures
claudemem --agent map "fixture factory builder"```

### Test Coverage Gaps (v0.4.0+ Required)

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

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

# Focus on critical gaps only
claudemem --agent test-gaps --min-pagerank 0.05```

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

```bash
# Get callers for a function
claudemem --agent callers importantFunction
# 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 --agent callers authenticateUserclaudemem --agent callers processPaymentclaudemem --agent callers saveToDatabase
# Note which have test callers and which don't

PHASE 0: MANDATORY SETUP

Step 1: Verify claudemem v0.3.0

which claudemem && claudemem --version
# Must be 0.3.0+

Step 2: If Not Installed → STOP

Use AskUserQuestion (see ultrathink-detective for template)

Step 3: Check Index Status

# Check claudemem installation and index
claudemem --version && ls -la .claudemem/index.db 2>/dev/null

Step 3.5: Check Index Freshness

Before proceeding with investigation, verify the index is current:

# First check if index exists
if [ ! -d ".claudemem" ] || [ ! -f ".claudemem/index.db" ]; then
  # Use AskUserQuestion to prompt for index creation
  # Options: [1] Create index now (Recommended), [2] Cancel investigation
  exit 1
fi

# Count files modified since last index
STALE_COUNT=$(find . -type f \( -name "*.ts" -o -name "*.tsx" -o -name "*.js" -o -name "*.jsx" -o -name "*.py" -o -name "*.go" -o -name "*.rs" \) \
  -newer .claudemem/index.db 2>/dev/null | grep -v "node_modules" | grep -v ".git" | grep -v "dist" | grep -v "build" | wc -l)
STALE_COUNT=$((STALE_COUNT + 0))  # Normalize to integer

if [ "$STALE_COUNT" -gt 0 ]; then
  # Get index time with explicit platform detection
  if [[ "$OSTYPE" == "darwin"* ]]; then
    INDEX_TIME=$(stat -f "%Sm" -t "%Y-%m-%d %H:%M" .claudemem/index.db 2>/dev/null)
  else
    INDEX_TIME=$(stat -c "%y" .claudemem/index.db 2>/dev/null | cut -d'.' -f1)
  fi
  INDEX_TIME=${INDEX_TIME:-"unknown time"}

  # Get sample of stale files
  STALE_SAMPLE=$(find . -type f \( -name "*.ts" -o -name "*.tsx" \) \
    -newer .claudemem/index.db 2>/dev/null | grep -v "node_modules" | grep -v ".git" | head -5)

  # Use AskUserQuestion (see template in ultrathink-detective)
fi

Step 4: Index if Needed

claudemem index

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 --agent test-gaps)

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

Phase 1: Map Test Infrastructure

# Find test configuration
claudemem --agent map "jest vitest mocha config"
# Find test utilities and mocks
claudemem --agent map "mock stub spy helper"```

### Phase 2: Identify Critical Functions

```bash
# Map the feature area
claudemem --agent map "payment processing"
# High-PageRank functions are most critical to test

Phase 3: Check Test Coverage via Callers

# For each critical function, check callers
claudemem --agent callers PaymentService
# 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 --agent map "payment"
# Step 2: For each function, check callers
claudemem --agent callers processPaymentclaudemem --agent callers validateCardclaudemem --agent callers chargeCustomer
# Step 3: Count test callers vs production callers

Scenario: Finding Coverage Gaps

# Step 1: Find high-PageRank (important) functions
claudemem --agent map
# Step 2: Check callers for each
claudemem --agent callers importantFunc1claudemem --agent callers importantFunc2
# Step 3: Functions with 0 test callers = gap

Scenario: Test Quality Audit

# Step 1: Find test callers
claudemem --agent callers targetFunction
# Step 2: Read each test file at the caller line
# Step 3: Check: Does test cover edge cases? Errors?

Result Validation Pattern

After EVERY claudemem command, validate results:

Callers Validation for Tests

When checking test coverage:

CALLERS=$(claudemem --agent callers processPayment)
EXIT_CODE=$?

# Check for command failure
if [ "$EXIT_CODE" -ne 0 ]; then
  DIAGNOSIS=$(claudemem status 2>&1)
  # Use AskUserQuestion for recovery
fi

# Validate we got callers, not an error
if echo "$CALLERS" | grep -qi "error\|failed"; then
  # Actual error, not 0 callers
  # Use AskUserQuestion
fi

# Count test vs production callers
TEST_CALLERS=$(echo "$CALLERS" | grep -E "\.test\.|\.spec\.|_test\." | wc -l)
PROD_CALLERS=$(echo "$CALLERS" | grep -v -E "\.test\.|\.spec\.|_test\." | wc -l)

# Report coverage ratio
if [ "$TEST_CALLERS" -eq 0 ]; then
  echo "WARNING: No test coverage found for this function"
fi

Empty Results Validation

RESULTS=$(claudemem --agent map "test spec describe")

if [ -z "$RESULTS" ]; then
  echo "WARNING: No test infrastructure found"
  # May indicate:
  # 1. Tests in non-standard locations
  # 2. Index doesn't include test files
  # 3. Wrong query terms
  # Use AskUserQuestion
fi

FALLBACK PROTOCOL

CRITICAL: Never use grep/find/Glob without explicit user approval.

If claudemem fails or returns irrelevant results:

1. STOP - Do not silently switch tools
2. DIAGNOSE - Run claudemem status
3. REPORT - Tell user what happened
4. ASK - Use AskUserQuestion for next steps

// Fallback options (in order of preference)
AskUserQuestion({
  questions: [{
    question: "claudemem test coverage analysis failed or found no tests. How should I proceed?",
    header: "Test Coverage Issue",
    multiSelect: false,
    options: [
      { label: "Reindex codebase", description: "Run claudemem index (~1-2 min)" },
      { label: "Try different query", description: "Search for different test patterns" },
      { label: "Use grep (not recommended)", description: "Traditional search - loses caller analysis" },
      { label: "Cancel", description: "Stop investigation" }
    ]
  }]
})

See ultrathink-detective skill for complete Fallback Protocol documentation.

Anti-Patterns

Output Truncation Warning

╔══════════════════════════════════════════════════════════════════════════════╗ ║ ║ ║ ❌ Anti-Pattern 7: Truncating Claudemem Output ║ ║ ║ ║ FORBIDDEN (any form of output truncation): ║ ║ → BAD: claudemem --agent map "query" | head -80 ║ ║ → BAD: claudemem --agent callers X | tail -50 ║ ║ → BAD: claudemem --agent search "x" | grep -m 10 "y" ║ ║ → BAD: claudemem --agent map "q" | awk 'NR <= 50' ║ ║ → BAD: claudemem --agent callers X | sed '50q' ║ ║ → BAD: claudemem --agent search "x" | sort | head -20 ║ ║ → BAD: claudemem --agent map "q" | grep "pattern" | head -20 ║ ║ ║ ║ CORRECT (use full output or built-in limits): ║ ║ → GOOD: claudemem --agent map "query" ║ ║ → GOOD: claudemem --agent search "x" -n 10 ║ ║ → GOOD: claudemem --agent map "q" --tokens 2000 ║ ║ → GOOD: claudemem --agent search "x" --page-size 20 --page 1 ║ ║ → GOOD: claudemem --agent context Func --max-depth 3 ║ ║ ║ ║ WHY: Output is pre-optimized; truncation hides critical results ║ ║ ║ ╚══════════════════════════════════════════════════════════════════════════════╝

Feedback Reporting (v0.8.0+)

After completing investigation, report search feedback to improve future results.

When to Report

Report feedback ONLY if you used the search command during investigation:

Feedback Pattern

# Track during investigation
SEARCH_QUERY="your original query"
HELPFUL_IDS=""
UNHELPFUL_IDS=""

# When reading a helpful result
HELPFUL_IDS="$HELPFUL_IDS,$result_id"

# When reading an unhelpful result
UNHELPFUL_IDS="$UNHELPFUL_IDS,$result_id"

# Report at end of investigation (v0.8.0+ only)
if claudemem feedback --help 2>&1 | grep -qi "feedback"; then
  timeout 5 claudemem feedback \
    --query "$SEARCH_QUERY" \
    --helpful "${HELPFUL_IDS#,}" \
    --unhelpful "${UNHELPFUL_IDS#,}" 2>/dev/null || true
fi

Output Update

Include in investigation report:

Search Feedback: [X helpful, Y unhelpful] - Submitted (v0.8.0+)

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: MadAppGang Plugin: code-analysis v2.7.0 Last Updated: December 2025 (v3.3.0 - Cross-platform compatibility, inline templates, improved validation)