Swift Testing

Build a release gate for Foundation Models features with evaluations, tool trajectory checks, and layered security mitigations.

Use Swift Testing exit tests to verify deliberate process exits without crashing the whole suite, including fatalError and preconditionFailure paths.

Record screenshots, JSON payloads, and plain-text diagnostics from Swift Testing so a failed test tells you what actually happened.

Convert a realistic XCTestCase into Swift Testing with @Suite, @Test, #expect, #require, async tests, parameterized tests, tags, and coexistence notes.