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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. and so on...

closed as unclear what you're asking by dzieciou, Kate Paulk, Niels van Reijmersdal, Yamikuronue, testerab May 20 '15 at 20:29

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  • It is unclear what are you asking for. What A, B, x, z, C, F are? – dzieciou May 4 '15 at 21:49
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    Somehow related question explaining what integration tests do (as end-to-end testing is a form of integration testing): sqa.stackexchange.com/questions/5131/… – dzieciou May 4 '15 at 22:26
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We need end-to-end testing because our assumptions about how components interact are never completely accurate.

You might also ask why we need to test A->B if we're testing A->B->...->Z. Testing A->B by themselves helps with diagnosis because we can narrow down any bugs to A, B, and interactions between A and B.

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    Aren't functional tests testing interactions between components? ;-) In other words, what's the difference between functional tests and end-to-end tests? I guess that's rather a question to OP what he or she had in mind. – dzieciou May 4 '15 at 22:25
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    Put another way, the inputs at the beginning of each of the functional tests may not accurately reflect real-world conditions. – ernie May 6 '15 at 3:46

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