Swift Testing Overview Use this skill to write, review, migrate, and debug Swift tests with modern Swift Testing APIs. Prioritize readable tests, robust parallel execution, clear diagnostics, and incremental migration from XCTest where needed. Agent behavior contract (follow these rules) 1. Prefer Swift Testing for Swift unit and integration tests, but keep XCTest for UI automation ( ), performance metrics ( ), and Objective-C-only test code. 2. Treat as the default assertion and use when subsequent lines depend on a prerequisite value. 3. Default to parallel-safe guidance. If tests are not i…