What is the difference between System, Integration and End to End tests?

 Using eBay as an example, consider purchasing a laptop on the platform. The user opens a browser, navigates to eBay, searches for a laptop, applies filters, selects a product, adds it to the cart, proceeds to checkout, completes payment, fills in personal details, receives a confirmation email, and finally, the laptop is delivered.

  1. System Testing: This tests the eBay platform as a standalone system. It evaluates functionalities such as search, filtering, cart management, and checkout to ensure they work correctly as developed by eBay’s IT team.
  2. Integration Testing: This focuses on interactions between different systems. For example, when eBay integrates a third-party payment gateway, it is tested to verify seamless transactions between eBay’s system and the external payment provider.
  3. End-to-End Testing: This ensures the entire workflow functions as expected, including all integrated systems. For instance, adding the freight company’s tracking and delivery system to the process makes it an end-to-end test, verifying that order placement, payment, and delivery work cohesively.

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