Swift Testing Baseline

When to invoke

• Starting a new project and choosing a test framework.
• Writing the first test target / first @Test case.
• Introducing CloudKit / GameKit / any network service and deciding whether to run integration tests on CI.
• Setting up SwiftUI snapshot testing.
• User asks "XCTest or swift-testing", "how do I do snapshots", "should CI connect to iCloud".

Default decisions

Framework

• swift-testing (Apple's official framework) for unit / integration tests; do not use XCTest at all.
• With no legacy code, the switch is zero-cost; swift-testing pairs well with Swift 6 / async.
• Name files by the type under test (<Type>Tests.swift) and group related cases with @Suite.

Snapshot testing