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diff --git a/languages/python/claude/rules/python-testing.md b/languages/python/claude/rules/python-testing.md index 6f04b7f..d2342c1 100644 --- a/languages/python/claude/rules/python-testing.md +++ b/languages/python/claude/rules/python-testing.md @@ -66,6 +66,22 @@ def test_add_item_quantity_validation(cart, quantity, valid): cart.add("SKU-1", quantity=quantity) ``` +### Pairwise / Combinatorial for Parameter-Heavy Functions + +When `@pytest.mark.parametrize` would require listing dozens of combinations +(feature flags × permissions × shipping × payment × etc.), switch to +combinatorial coverage via `/pairwise-tests`. The skill generates a minimal +matrix covering every 2-way parameter interaction — typically 80-99% fewer +cases than exhaustive, catching most combinatorial bugs. + +Workflow: invoke `/pairwise-tests` → get a PICT model + generated test matrix +→ paste the matrix into a pytest parametrize block, or use the helper to +emit directly. The `pypict` package (`pip install pypict`) handles +generation in-process. + +See `testing.md` § Combinatorial Coverage for the general rule and when +to skip. + ## Mocking Guidelines ### Mock these (external boundaries): |