Simple Unit Test

UnitTestExample.swift

// Project: ExampleTestApp

// ViewController.swift

func isNumberEven(num: Int) -> Bool {
  if num %2 == 0 {
    return true
  } else {
    return false
  }
}

// ViewControllerTests.swift

import XCTest
@testable import ExampleTestApp

class ViewControllerTests: XCTestCase {
  
  func testIsNumberEven() {
    let viewController = ViewController()
    let odd = 5
    let even = 4
    
    XCTAssertTrue(viewController.isNumberEven(num: even))
    XCTAssertFalse(viewController.isNumberEven(num: odd))
}
  
  // Test should pass