Basic XCTestCase Benchmark

XCTestCase+Benchmark.swift

extension XCTestCase {
    func benchmark(_ label: String, iterations: Int = 100, block: () throws -> Void) rethrows {
        var measures: [TimeInterval] = []
        let warmUp = iterations / 10

        for i in (0..<iterations) {
            let start = Date()
            try block()

            if i >= warmUp { // 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")
    }
}