Putting unit tests in context

- In our last section we talked about UI automation,…but there are a lot of different kinds of automated tests…that a quality engineer might employ.…We've already discussed some, like performance testing.…However, when a lot of people think about automated testing,…they envision a white-box tester creating suites…of code-oriented tests that can run…when a build is kicked off to alert the team…of newly injected bugs early on.…It's true that this is absolutely the kind…of task fit for a white-box tester.…

However, it's important to spend a little time…on what some of these tests really are.…You see, not all automated tests…should be written by a quality engineer.…What I'm talking about here is unit tests.…Now, you shouldn't assume that it's impossible…for a white-box tester to create unit tests,…and there are some situations where it might make sense.…However, most of the time a unit test…should be written by a developer.…To understand what a unit test is,…you need to understand one simple concept…in object-oriented programming,…