tests.swift

//-----------------------------------------------------------------------------
// MARK: Time Test
//-----------------------------------------------------------------------------

import Foundation

/// Prints the elapsed time to execute a block under whatever optimization
/// conditions are currently in use by the compiler
public func timetest(_ note: String, block: () -> Void) {
  print("Starting Test:", note)
  let now = ProcessInfo().systemUptime
  block()
  let timeInterval = ProcessInfo().systemUptime - now
  print("Ending Test:", note); print("Elapsed time: \(timeInterval)")
}

extension Int {
  var isOdd: Bool { return !self.isMultiple(of: 2) }
}

public func test() {
  let TESTCOUNT = 100_000
  let VALUECOUNT = 1_000
  var nums: [Int] = []
  
  // Fill up with random numbers, so the tests should never succeed
  for _ in 1 ... VALUECOUNT {
    nums.append(Int.random(in: 1 ... 1_000_000))
  }
  
  print("Running \(TESTCOUNT) tests on an array of \(VALUECOUNT) values")
  
  timetest("contains") {
    var wins = 0
    for _ in 1 ... TESTCOUNT {
      // every element is 9
      let success1 = !nums.contains(where: { $0 != 9 })
      // every element is odd
      let success2 = !nums.contains(where: { !$0.isOdd })
      wins += success1 || success2 ? 1 : 0
    }
    print("Note: wincount sink: \(wins)")
  }
  timetest("reduce") {
    var wins = 0
    for _ in 1 ... TESTCOUNT {
      // every element is 9
      let success1 = nums.reduce(true, { $0 && $1 == 9 })
      // every element is odd
      let success2 = nums.reduce(true, { $0 && $1.isOdd })
      wins += success1 || success2 ? 1 : 0
    }
    print("Note: wincount sink: \(wins)")
  }
  timetest("allSatisfy") {
    var wins = 0
    for _ in 1 ... TESTCOUNT {
      // every element is 9
      let success1 = nums.allSatisfy({ $0 == 9 })
      // every element is odd
      let success2 = nums.allSatisfy({ $0.isOdd })
      wins += success1 || success2 ? 1 : 0
    }
    print("Note: wincount sink: \(wins)")
  }
  timetest("filter") {
    var wins = 0
    for _ in 1 ... TESTCOUNT {
      // every element is 9
      let success1 =  nums.filter({ $0 != 9 }).isEmpty
      // every element is odd
      let success2 = nums.filter({ !$0.isOdd }).isEmpty
      wins += success1 || success2 ? 1 : 0
    }
    print("Note: wincount sink: \(wins)")
  }
}