FsCheck.Xunit doesn't support C# async tests

With a test like:

[Property]
public async Task TestWhatever(int i)
{
    Assert.True(await DoSomething(i));
}

The Xunit runner fails with:

 System.Exception:
 No instances of class FsCheck.Testable+Testable`1[a] for type System.Threading.Tasks.Task

[kurtschelfthout]

I think it’s fine to use it - I’ve been considering getting 3.0 out pretty much as is, and moving all the long term stuff to a subsequent version.

[kurtschelfthout]

This is now in pre-release in NuGet in 3.0-alpha1: https://www.nuget.org/packages/FsCheck/3.0.0-alpha1

Please try it out and open new issues in case of problems.