public void TestGetValuebyIndex(int[] intArray, int index, int expectedResult)
        {
            BL.Test2 question2BL = new BL.Test2();

            // Act
            int result = question2BL.GetValuebyIndex(intArray, index);

            // Assert
            Assert.That(result == expectedResult);
        }
        public void TestGetValuebyIndexException()
        {
            BL.Test2 question2BL = new BL.Test2();

            // Act
            var result = Assert.Throws <IndexOutOfRangeException>(() => question2BL.GetValuebyIndex(new int[] { 1, 2, 3 }, 4)).Message;

            // Assert
            Assert.AreEqual("Index was outside the bounds of the array.", result);
        }