Mike Cohn introduced the test automation pyramid in his book Succeeding with Agile: Software Development Using Scrum , which is a concept that defines three layers against which tests can be automated: Unit, Services, and User Interface. Test Automation Pyramid If one reason you’re automating tests is to get things done quickly, you’ll want to make sure your automated tests run as quickly as possible. One way to do this is to automate the tests so that they are as close as possible to production. Unit Level of The Pyramid Automated Unit testing is a process in which the smallest testable parts of an application, called units, are individually and independently scrutinized for proper operation. Unit tests are small, modular tests that check the logic of individual functions without using other functions, databases, or user interfaces. Unit tests are fast, and they can pinpoint the exact function where a bug is occurring. Because of this, most of the automated tests should be writte...