❔ Unit Test | Mocking class with unsafe methods

Hi, I am having trouble writing unit tests, because I dont know how to mock/setup the underlying instance/its methods.

The class

Silk.NET.OpenCL.CL

Silk.NET.OpenCL.CL

(https://github.com/dotnet/Silk.NET/blob/main/src/OpenCL/Silk.NET.OpenCL/CL.gen.cs) does not implement an interface and the methods are unsafe and non virtual.
This would be one of the methods I need to mock:

public unsafe int GetPlatformIDs(uint num_entries, nint* platforms, out uint num_platforms);

public unsafe int GetPlatformIDs(uint num_entries, nint* platforms, out uint num_platforms);

(instead of

out uint num_platforms

out uint num_platforms

I could also use

uint* num_platforms

uint* num_platforms

, if that matters)

I tried using Moq, but I run into errors for the null pointer and count parameter:

        unsafe
        {
            var cl = new Mock<CL>();
            cl.Setup(instance => instance.GetPlatformIDs(0, null, out var count)).Returns(0);
            // ....
        }

        unsafe
        {
            var cl = new Mock<CL>();
            cl.Setup(instance => instance.GetPlatformIDs(0, null, out var count)).Returns(0);
            // ....
        }

CS1944: An expression tree may not contain an unsafe pointer operation
CS8198: An expression tree may not contain an out argument variable declaration

( I tried also other libraries like Pose, but they all use

System.Linq.Expressions.Expression

System.Linq.Expressions.Expression

so I always ran into the same errors)

Any idea how to do that?

C#•3y ago•

3 replies

cap5lut

❔ Unit Test | Mocking class with unsafe methods

Hi, I am having trouble writing unit tests, because I dont know how to mock/setup the underlying instance/its methods.

The class

Silk.NET.OpenCL.CL

Silk.NET.OpenCL.CL

public unsafe int GetPlatformIDs(uint num_entries, nint* platforms, out uint num_platforms);

public unsafe int GetPlatformIDs(uint num_entries, nint* platforms, out uint num_platforms);

(instead of

out uint num_platforms

out uint num_platforms

I could also use

uint* num_platforms

uint* num_platforms

, if that matters)

I tried using Moq, but I run into errors for the null pointer and count parameter:

        unsafe
        {
            var cl = new Mock<CL>();
            cl.Setup(instance => instance.GetPlatformIDs(0, null, out var count)).Returns(0);
            // ....
        }

        unsafe
        {
            var cl = new Mock<CL>();
            cl.Setup(instance => instance.GetPlatformIDs(0, null, out var count)).Returns(0);
            // ....
        }

CS1944: An expression tree may not contain an unsafe pointer operation
CS8198: An expression tree may not contain an out argument variable declaration

( I tried also other libraries like Pose, but they all use

System.Linq.Expressions.Expression

System.Linq.Expressions.Expression

so I always ran into the same errors)

Any idea how to do that?

❔ Unit Test | Mocking class with unsafe methods

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