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33 lines
586 B
Markdown
33 lines
586 B
Markdown
# Interface Design for Testability
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Good interfaces make testing natural:
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1. **Accept dependencies, don't create them**
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```python
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# Testable
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def process_order(order, payment_gateway):
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pass
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# Hard to test
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def process_order(order):
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gateway = StripeGateway()
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```
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2. **Return results, don't produce side effects**
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```python
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# Testable
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def calculate_discount(cart) -> float:
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return discount
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# Hard to test
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def apply_discount(cart) -> None:
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cart.total -= discount
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```
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3. **Small surface area**
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* Fewer methods = fewer tests needed
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* Fewer params = simpler test setup
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