How to mock methods that take Span<T>?

[asaf92]

Question Is it possible to mock methods that take Span<T> and capture the arguments? Using Arg.Do, I'm getting an error that:

The type 'Span<...>' may not be used as a type argument

Example:

public interface IFoo
{
    public void Bar(Span<int> nums);
    public void Bar(IList<int> nums);
}

[Test]
public void MockDemo()
{
    var sum = 0;
    var mock = Substitute.For<IFoo>();
    mock.Bar(Arg.Do<IList<int>>(x => sum += x[0])); // This works
    // mock.Bar(Arg.Do<Span<int>>(x => sum += x[0])); // Error CS0306
}

[304NotModified]

I think we have to add support for Spans to get this working. So I tag this a feature request

[artkolisnyk]

It has been 4 years. Any updates regarding this feature?

I'm facing a similar issue where I need a Span<byte> in Arg.Is() call.

[304NotModified]

Unfortunately not. A PR is more than welcome