End-to-end testing is a way of performing testing used to test the business flow of an application or system from start to finish. It can be a part of integration testing to check dependencies between components of the system.

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Why is end to end testing needed? [closed]

Isn't end to end already tested when you do different levels of functional tests? For example: 1. Test A -> B (but to do this, need to do x -> z) 2. Test C -> F (but to do this, need to do A -> B) 3. ...
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Should I re-test fix at system level when the issue is at unit level?

I found a defect in manual end-to-end tests. We were able with developers to isolate the possible root cause in one of the components. We wrote a unit test that reproduces the defect at unit level. ...