XCTMetric面白い。 class PerformanceTests: XCTestCase { override func measure(_ block: () -> Void) { if #available(macOS 10.15, iOS 13, tvOS 13, *) { let metrics: [XCTMetric] = [XCTClockMetric(), XCTCPUMetric(), XCTMemoryMetric(), XCTStorageMetric()] super.measure(metrics: metrics, block: block) } else { super.measure(block) } } …