How do I put new List {1} in an NUNIT TestCase?

Question

I have the method:

public static int Add(List numbers)
    {
        if (numbers == null || numbers.Count == 0)
            return 0;

        if          


        

Answer 1

use array as parameter new [] {1, 2} for the Testcases and convert it to List inside the test method numbers.ToList().

using System.Linq
...

[TestCase(new [] {1}, 1)]
[TestCase(new [] {1, 2}, 3)]
[TestCase(new [] {1, 2, 3}, 6)]
public void Return_sum_of_numbers(int[] numbers, int expectedSum)
{
    var sum = CalculatorLibrary.CalculatorFunctions.Add(numbers.ToList());

    Assert.AreEqual(expectedSum, sum );
    // much cooler with FluentAssertions nuget:
    // sum.Should.Be(expectedSum);
}