The next test up the testing hierarchy is the integration test. You’ll run them often, so you want them to run fast. A unit test should take milliseconds to execute. Multiple unit tests may test the same piece of code, but each unit test itself should only focus on a single unit of code. ![]() Each unit test ensures that you get the expected output when a function processes a given input. The base of all testing, and the foundation of all other tests, is the unit test. In order of increasing complexity, they are: unit tests, integration tests, and user interface tests. There are three types of tests that you’ll use in your apps. In this chapter, you’ll learn how to implement UI tests in your SwiftUI app, and what to watch out for when testing your UI under this new paradigm. And not only do tests check that your code works as expected, but it’s also some assurance that future changes won’t break existing functionality.
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