Swift Testing Migration

Swift Testing for unit and integration tests; XCTest stays for UI tests under cmuxUITests/ (Swift Testing has no XCUIApplication support).

New tests

import Testing

@Suite
struct ExampleTests {
    @Test
    func computesValue() {
        #expect(1 + 1 == 2)
    }
}

Use try #require(...) when a value must be unwrapped before continuing.

XCTest conversion mapping

Convert in place only when an edit naturally crosses the file; do not bulk-rewrite untouched tests.

Parameterized tests

@Test(arguments: [
    ("input-a", "output-a"),
    ("input-b", "output-b"),
])
func formats(input: String, expected: String) {
    #expect(format(input) == expected)
}

Parallel execution

Tests run in parallel by default, including across suites. Prefer isolated temp directories and injected dependencies; use @Suite(.serialized) only when a suite genuinely needs ordering or guards shared mutable state.