Hands-On Server-Side Web Development with Swift

Writing tests using XCTest

The following diagram illustrates how you can build a test using the XCTest framework in Swift:

When running tests, XCTest finds all the test classes in our application. Each test class is a subclass of XCTestCase [1]. XCTest runs the setUp() method [2] and then all of the class's test methods.

Each test method [3] that implements a test always has the prefix test, takes no parameters, and returns no values. A test method may have an optional block called addTeardownBlock(_:) for us to add additional cleanup code. This is useful if we need to destroy a resource created locally in the test method.

If XCTest runs ...