public void BinarySearchTest_WithNullArray()
 => Assert.Throws <ArgumentNullException>(() => BinarySearchEngine.BinarySearch(null, 4));
 public void BinarySearchTest_WithNullValue()
 => Assert.Throws <ArgumentNullException>(() => BinarySearchEngine.BinarySearch(new string[] { "1", "2", "4" }, null));
 public int?BinarySearchTest(int[] array, int value)
 => BinarySearchEngine.BinarySearch(array, value);