application/json-seqでテストの状況を出力するぽい。受け取る側はパイプを渡す。 @swift-main testing -- --event-stream-output-path event-stream.json

@Test func helloWorld() { let greeting = "Hello, world!" #expect(greeting == "Hello, world!") // Expectation failed: (greeting → "Hello, world!") == "Hello" }