如何在nunit TestCases中使用元组？

private static IEnumerable<(int, int)> TestData()
{
    yield return (2, 4);
    yield return (3, 9);
    yield return (4, 16);
}

[TestFixture]
public class MyTests
{
    [Test]
    [TestCaseSource(nameof(TestData))]
    public void MyTest((int input, int expected) testCase)
    {
        int result = Square(testCase.input);
        Assert.AreEqual(testCase.expected, result);
    }

    private int Square(int num)
    {
        return num * num;
    }
}