claude-mods/tests/skills/functional/code-stats.md

code-stats Functional Tests

Verify tokei and difft commands work correctly.

Prerequisites

# Check tools are installed
tokei --version   # tokei 12.x+
difft --version   # difftastic 0.50+

---

tokei Tests

Test 1: Basic line count

tokei .

Expected: Table showing:

• Languages detected
• Files count per language
• Lines of code, comments, blanks

Test 2: Specific language

tokei -t=TypeScript .

Expected: Only TypeScript file statistics

Test 3: Compact output

tokei --compact .

Expected: Single-line per language format

Test 4: Exclude directories

tokei -e node_modules -e .git .

Expected: Stats excluding node_modules and .git

Test 5: JSON output

tokei -o json . | jq '.TypeScript'

Expected: JSON with language breakdown

---

difft (difftastic) Tests

Test 6: Compare two files

# Create test files
cat > /tmp/old.js << 'EOF'
function greet(name) {
  console.log("Hello, " + name);
}
EOF

cat > /tmp/new.js << 'EOF'
function greet(name) {
  console.log(`Hello, ${name}!`);
}
EOF

difft /tmp/old.js /tmp/new.js

rm /tmp/old.js /tmp/new.js

Expected: AST-aware diff showing string template change

Test 7: Compare with syntax highlighting

cat > /tmp/v1.py << 'EOF'
def add(a, b):
    return a + b
EOF

cat > /tmp/v2.py << 'EOF'
def add(a: int, b: int) -> int:
    return a + b
EOF

difft /tmp/v1.py /tmp/v2.py

rm /tmp/v1.py /tmp/v2.py

Expected: Shows type annotation additions

Test 8: Git integration

# Configure difft as git diff tool (if not already set)
git config diff.external difft

# Run git diff (reverts after test)
GIT_EXTERNAL_DIFF=difft git diff HEAD~1 --stat

Expected: Semantic diff output

---

Integration Tests

Test 9: Full codebase analysis

# Get overview
tokei --compact .

# Get detailed breakdown
tokei --files .

Expected: Complete statistics for the project

Test 10: Compare versions

# Compare current file with previous commit
difft <(git show HEAD~1:package.json 2>/dev/null || echo '{}') package.json

Expected: Diff between versions (or error if file doesn't exist in history)

---

Performance Test

Test 11: Large codebase timing

time tokei . --compact

Expected: Completes in under 2 seconds for most projects