leo-claude-mktplace/plugins/projman/commands/test-gen.md

description

description
Generate tests for specified code - creates unit, integration, or e2e tests

Test Generation

Generate comprehensive tests for specified code.

Usage

/test-gen <target> [--type=<type>] [--framework=<framework>]

Target: File path, function name, class name, or module Type: unit (default), integration, e2e, snapshot Framework: Auto-detected or specify (pytest, jest, vitest, go test, etc.)

Process

1. Analyze Target Code

   • Parse function/class signatures
   • Identify dependencies and side effects
   • Map input types and return types
   • Find edge cases from logic branches

2. Determine Test Strategy

   Code Pattern	Test Approach
   Pure function	Unit tests with varied inputs
   Class with state	Setup/teardown, state transitions
   External calls	Mocks/stubs for dependencies
   Database ops	Integration tests with fixtures
   API endpoints	Request/response tests
   UI components	Snapshot + interaction tests

3. Generate Tests

   For each target function/method:

   • Happy path test (expected inputs → expected output)
   • Edge cases (empty, null, boundary values)
   • Error cases (invalid inputs → expected errors)
   • Type variations (if dynamic typing)

4. Test Structure

   # Example output for Python/pytest
   
   import pytest
   from module import target_function
   
   class TestTargetFunction:
       """Tests for target_function."""
   
       def test_happy_path(self):
           """Standard input produces expected output."""
           result = target_function(valid_input)
           assert result == expected_output
   
       def test_empty_input(self):
           """Empty input handled gracefully."""
           result = target_function("")
           assert result == default_value
   
       def test_invalid_input_raises(self):
           """Invalid input raises ValueError."""
           with pytest.raises(ValueError):
               target_function(invalid_input)
   
       @pytest.mark.parametrize("input,expected", [
           (case1_in, case1_out),
           (case2_in, case2_out),
       ])
       def test_variations(self, input, expected):
           """Multiple input variations."""
           assert target_function(input) == expected
   

5. Output

## Tests Generated

### Target: src/orders.py:calculate_total

### File Created: tests/test_orders.py

### Tests (6 total)
- test_calculate_total_happy_path
- test_calculate_total_empty_items
- test_calculate_total_negative_price_raises
- test_calculate_total_with_discount
- test_calculate_total_with_tax
- test_calculate_total_parametrized_cases

### Coverage Estimate
- Line coverage: ~85%
- Branch coverage: ~70%

### Run Tests
pytest tests/test_orders.py -v

Framework Detection

Files Present	Framework Used
pytest.ini, conftest.py	pytest
jest.config.*	jest
vitest.config.*	vitest
*_test.go	go test
Cargo.toml	cargo test
mix.exs	ExUnit

Integration with /test-check

• /test-gen creates new tests
• /test-check verifies tests pass
• Typical flow: /test-gen src/new_module.py → /test-check