如何用"out"参数编写私有函数的C#测试用例？

private bool PrivateFunction(out int result)
{
    // 在这里执行私有函数的逻辑
    result = 42;
    return true;
}

public bool PublicFunction(out int result)
{
    return PrivateFunction(out result);
}

using NUnit.Framework;

[TestFixture]
public class TestClass
{
    [Test]
    public void TestPrivateFunction()
    {
        int result;
        bool success = PublicFunction(out result);
        Assert.IsTrue(success);
        Assert.AreEqual(42, result);
    }
}