cs-tests

name	cs-tests
description	Generate unit tests from code paths. Uses symbolic execution to explore branches, identify edge cases, and auto-generate pytest/unittest test cases.
allowed-tools	["mcp__codescalpel__extract_code","mcp__codescalpel__symbolic_execute","mcp__codescalpel__generate_unit_tests"]
preamble-tier	1

/cs-tests — Generate Tests from Code Paths

Auto-generate unit tests by analyzing execution paths through a function. Finds edge cases, branches, and error conditions automatically.

Usage

/cs-tests src/utils.py function calculate_tax
/cs-tests src/validation.py function validate_email
/cs-tests src/api.py function handle_request

How It Works

1. Extract — Get the function you want to test
2. Symbolic Execute — Run the code symbolically to explore all branches
   • Finds path conditions (if/else, loops, exceptions)
   • Identifies edge cases and dead code
3. Generate Tests — Create pytest test cases for each path
   • Happy path (normal inputs)
   • Error cases (invalid inputs)
   • Edge cases (boundary values)
   • Dead code detection

What You Get

A test file with:

• ✅ One test per execution path
• ✅ Different input types (valid, invalid, boundary)
• ✅ Exception handling tests
• ✅ pytest or unittest format (you choose)

Test Generation Framework

Supports:

• pytest (recommended, modern)
• unittest (legacy, standard library)

Example Output

def test_calculate_tax_normal():
    assert calculate_tax(100) == 10.0

def test_calculate_tax_zero():
    assert calculate_tax(0) == 0.0

def test_calculate_tax_negative_raises():
    with pytest.raises(ValueError):
        calculate_tax(-100)

Next Steps

1. Review the generated tests
2. Run them: pytest test_*.py
3. Adjust assertions if needed
4. Commit to your test suite

Pro Tip

Generate tests BEFORE refactoring to create a safety baseline:

/cs-tests src/legacy_code.py function complex_function
# Now safe to refactor—tests will catch breakage
/cs-refactor src/legacy_code.py function complex_function

See CLAUDE.md for the full test generation workflow.