best way to test view models

To test view models effectively, you can leverage the new features and improvements in Xcode 16 and Swift testing. Here are some key points and sessions that can help you:

1. Swift Testing Basics:

   • Test Functions: Use the @Test attribute to mark functions as tests. These functions can be global or methods in a type, and they can be marked async or throws if needed.
   • Expectations and Traits: Use #expect and #require macros to verify test results. Traits can add information or change the behavior of tests.
   • Suites: Group related tests into suites to avoid unintentional state sharing and reduce repetition.

   You can learn more about these basics in the session Meet Swift Testing.

2. Parameterized Tests:

   • Swift testing allows you to run the same test with different arguments, which is useful for testing view models with various inputs. Each provided argument runs in parallel as its own test case.

   This is demonstrated in the session What’s new in Xcode 16.

3. Tag-Based Organization:

   • Use tags to group and filter tests across different suites. This helps in organizing tests related to specific features or components, such as view models.

   More details can be found in the session What’s new in Xcode 16.

4. Running and Debugging Tests:

   • Xcode provides various ways to run tests, including running tests repeatedly to catch non-deterministic failures. You can also use the test navigator to focus on specific tests or failures.

   Check out the session Xcode essentials for more information on running tests.

5. Test Reports and Debugging:

   • Utilize the test report to get detailed information about test runs, including screen recordings and timelines to pinpoint failures.

   This is covered in the session Xcode essentials.

By following these practices and utilizing the new features in Xcode 16 and Swift testing, you can effectively test your view models and ensure they work as expected under various conditions.