public FibonacciNumberHandlerTests()
 {
     _sut = new FibonacciNumberHandler();
 }
        public EvenFibonacciNumberSumIntegrationTests()
        {
            var fibonacciNumberHandler = new FibonacciNumberHandler();

            _sut = new EvenFibonacciNumbersSum(fibonacciNumberHandler);
        }