Design patterns · interview question
What testing benefit do you gain by putting provider selection in a factory and provider quirks in adapters?
Multiple choiceMediumchapter-13-curatedpremiumdesign-patternsfactory-pattern
Answer and explanation
Correct answer
B. Checkout tests can target one stable PaymentGateway contract instead of every vendor SDK
Why
A clean boundary lets application tests exercise the checkout workflow against a stable interface, while smaller adapter tests focus on provider-specific request mapping and error handling.
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