How to distinguish modular, end-to-end, and integration tests by their purpose and scope?
sobes.tech AI
Answer from AI
Tests differ in coverage level and purpose:
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Unit tests check individual functions or classes in isolation. The goal is to ensure that individual components work correctly.
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Integration tests verify the interaction between multiple modules or components. They identify errors in connections and data exchange between parts of the system.
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End-to-end (E2E) tests simulate user behavior and test the entire system, including UI, backend, and databases. The goal is to ensure that all components work together and business processes are executed correctly.
Example: a unit test will check a sum calculation function, an integration test will verify data transfer correctness between services, and an E2E test will cover the order placement process from product selection to payment.