Agile testing has to work with the Agile lifecycle and processes adopted by your team. For example, if you adopt the Scrum methodology, that means you will have to conduct your testing within the Sprint cycles. Agile is about incremental development. So small pieces of functionality are delivered during each iteration. The challenge here is to ensure that new functionality does not break existing functionality. The typically shorter iteration duration of Agile methodology makes this more demanding.

Agile teams have typically tried to adopt Test-Driven Development (TDD) as a solution for testing needs. This is a good solution in many respects, but care has to be taken to implement TDD properly. For example, discussions about TDD usually tend to focus on unit test coverage, which is a major subset, but not the only aspect of testing. Automated testing should also cover system-level testing and workflows that cover functionality across multiple modules. 100% code coverage may sometimes be misleading because workflows may require additional tests.