Basic XCTestCase Benchmark

XCTestCase+Benchmark.swift

extension XCTestCase {
    func benchmark(_ label: String, block: () -> Void) {
        var measures: [TimeInterval] = []

        for i in (0..<1_010) {
            let start = Date()
            block()

            if i >= 10 { // only measure after it is warmed-up
                let stop = Date()
                measures.append(stop.timeIntervalSince(start))
            }
        }

        let sum = measures.reduce(0, +)
        let avg = sum / Double(measures.count)

        print("⭐️ AVG in \(label): \(avg * 1_000) ms")
    }
}