lmiranda
23537158bc
Adds test generation command that complements existing /test-check: - Auto-detects test framework (pytest, jest, vitest, go test, etc.) - Generates unit, integration, e2e, or snapshot tests - Creates happy path, edge case, and error tests - Supports multiple languages (Python, JavaScript, Go, etc.) - Integrates with /test-check for generate-then-verify workflow Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
119 lines
3.2 KiB
Markdown
119 lines
3.2 KiB
Markdown
---
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description: Generate tests for specified code - creates unit, integration, or e2e tests
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---
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# Test Generation
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Generate comprehensive tests for specified code.
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## Usage
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```
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/test-gen <target> [--type=<type>] [--framework=<framework>]
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```
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**Target:** File path, function name, class name, or module
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**Type:** unit (default), integration, e2e, snapshot
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**Framework:** Auto-detected or specify (pytest, jest, vitest, go test, etc.)
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## Process
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1. **Analyze Target Code**
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- Parse function/class signatures
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- Identify dependencies and side effects
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- Map input types and return types
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- Find edge cases from logic branches
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2. **Determine Test Strategy**
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| Code Pattern | Test Approach |
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|--------------|---------------|
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| Pure function | Unit tests with varied inputs |
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| Class with state | Setup/teardown, state transitions |
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| External calls | Mocks/stubs for dependencies |
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| Database ops | Integration tests with fixtures |
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| API endpoints | Request/response tests |
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| UI components | Snapshot + interaction tests |
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3. **Generate Tests**
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For each target function/method:
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- Happy path test (expected inputs → expected output)
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- Edge cases (empty, null, boundary values)
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- Error cases (invalid inputs → expected errors)
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- Type variations (if dynamic typing)
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4. **Test Structure**
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```python
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# Example output for Python/pytest
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import pytest
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from module import target_function
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class TestTargetFunction:
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"""Tests for target_function."""
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def test_happy_path(self):
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"""Standard input produces expected output."""
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result = target_function(valid_input)
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assert result == expected_output
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def test_empty_input(self):
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"""Empty input handled gracefully."""
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result = target_function("")
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assert result == default_value
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def test_invalid_input_raises(self):
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"""Invalid input raises ValueError."""
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with pytest.raises(ValueError):
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target_function(invalid_input)
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@pytest.mark.parametrize("input,expected", [
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(case1_in, case1_out),
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(case2_in, case2_out),
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])
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def test_variations(self, input, expected):
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"""Multiple input variations."""
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assert target_function(input) == expected
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```
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5. **Output**
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```
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## Tests Generated
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### Target: src/orders.py:calculate_total
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### File Created: tests/test_orders.py
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### Tests (6 total)
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- test_calculate_total_happy_path
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- test_calculate_total_empty_items
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- test_calculate_total_negative_price_raises
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- test_calculate_total_with_discount
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- test_calculate_total_with_tax
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- test_calculate_total_parametrized_cases
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### Coverage Estimate
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- Line coverage: ~85%
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- Branch coverage: ~70%
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### Run Tests
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pytest tests/test_orders.py -v
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```
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## Framework Detection
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| Files Present | Framework Used |
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|---------------|----------------|
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| pytest.ini, conftest.py | pytest |
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| jest.config.* | jest |
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| vitest.config.* | vitest |
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| *_test.go | go test |
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| Cargo.toml | cargo test |
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| mix.exs | ExUnit |
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## Integration with /test-check
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- `/test-gen` creates new tests
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- `/test-check` verifies tests pass
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- Typical flow: `/test-gen src/new_module.py` → `/test-check`
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