C# xUnit conversion issue when using InlineData

Question

Let's say I have the following model:

public class A
{
   public decimal? Property { get; set; }
}

And I want to test a method, depending on that "Property", passing values as a parameter. I thought this will work, but I'm not surprised it doesn't, since the InlineData attribute accepts an array of objects.

[Theory]
[InlineData(-10.0)]
[InlineData(0)]
[InlineData(null)]
public void Test(decimal? property)
{
    var a = new A();
    a.Property = property;
    // Unit test logic
}

When running the tests, it passes for the null value, but the numeric values throw "ArgumentException" exception:

System.ArgumentException : Object of type 'System.Double' cannot be converted to type 'System.Nullable`1[System.Decimal]'.

My question is: is it possible to use [Theory] & [InlineData] for such cases? Or should I have a separate test for each?

Answer 1

I found this question

The second answer is a workaround that seems to work, change the signature to receive a double? and then cast it to decimal?

[Theory]
[InlineData(-10.0)]
[InlineData(0)]
[InlineData(null)]
public void Test(double? property)
{
    var a = new A();
    a.Property = (decimal?) property;
    // Unit test logic
}