We had this small conversation with my colleague, what Agile Testing really is and is there a conceptional difference between these two?
One thing should be common. Both should verify that the customer expectations are satisfied. But when in waterfall way of testing, the testing phase is long and in the beginning of testing condition of software is uncertain, in Agile the emphasis is always on working software, situation where we are each moment should be clear. This is done by using Continuous Integration, with Automated Regression tests.
Finding bugs is one of the main reasons of testing in waterfall model. In Agile, on the other hand, and especially when using Engineering practices like Test Driven Development (TDD) and Acceptance Test Driven Development (ATDD), tests are telling when things are done and bugs are avoided in the first place.
Also iterative way of doing makes planning different. In waterfall, testers have a long period of test planning, but in Agile test planning is made in the same way as everything else, in the last moment (of course not too late :) ) and also it's short term.
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