Trevor Whittingham • 3/10/2026

Test fatalError and preconditionFailure with Swift Testing Exit Tests

This article explains how to use Swift Testing's exit tests to handle and verify code that terminates the process, such as fatalError, preconditionFailure, or command-line tool exits. It covers the API, platform availability (macOS, Linux, etc., but not iOS simulator), and provides examples for testing fatal paths and exit codes. The article is a technical tutorial focused on Swift testing techniques for developers.

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#Swift #Swift Testing #Exit Tests