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End-to-end testing, or E2E testing, is a type of performance test go-through during the cycle of mobile app development. All of the functionalities of the product are tested from one end to another to ensure that the entire application flow functions without setbacks. In fact, one of the primary goals of E2E testing is to provide makers with context about the user experience. The real user experience is simulated and all the integral components are validated under test.