How can I move Swift to testing?

To move your Swift code to testing, you can use the new Swift Testing framework introduced by Apple. Here are the steps and some key points to help you get started:

1. Add a Test Bundle Target:

   • In Xcode, choose File > New > Target, then search for Unit Testing Bundle in the test section. Swift Testing is now the default choice for this template in Xcode 16. Choose a name for your new target and click finish.

2. Writing Tests:

   • To declare a test, add a @Test attribute to your function. You can provide a custom display name as an argument to the @Test attribute to make it easier to understand what the test is doing.
   • Use the expect macro to evaluate the result of any Swift expression, making it easy to write complex checks.

3. Migrating from XCTest:

   • If you have existing tests written with XCTest, you can migrate them to Swift Testing. Swift Testing uses the @Test attribute to denote test functions explicitly, unlike XCTest which uses method names starting with test.
   • Swift Testing supports more kinds of functions, including instance methods, static methods, and global functions.
   • It also supports traits for specifying information per test or per suite and takes a different approach to parallelization by running in-process using Swift concurrency.

4. Running Tests:

   • You can run tests from the terminal by typing swift test. This command runs both XCTest and Swift Testing tests, showing pass and fail results with detailed failure messages.

5. Organizing Tests:

   • Swift Testing allows you to use tags to organize and filter your tests. You can also parameterize tests to avoid duplicating the same test for multiple inputs.

6. Community and Open Source:

   • Swift Testing is open source and hosted on GitHub. It has an open feature proposal process, and you can get involved by writing or participating in feature proposals, improving documentation, or filing bug reports.

For more detailed information, you can watch the session Meet Swift Testing which covers the building blocks and common workflows of Swift Testing.

Relevant Sessions

1. Meet Swift Testing
2. Go further with Swift Testing
3. Platforms State of the Union
4. What’s new in Swift

These sessions provide comprehensive insights into Swift Testing and how to effectively use it in your development process.