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Thank you for reporting this! The example should be something like

public static class Testing
{
    public static Task<ImmutableArray<Resource>> RunAsync<T>() where T : Stack, new()
    {
        var mocks = new Mock<IMocks>();
        mocks.Setup(m => m.NewResourceAsync(It.IsAny<MockResourceArgs>()))
            .ReturnsAsync((MockResourceArgs args) => (args.Id, args.Inputs));
        mocks.Setup(m => m.CallAsync(It.IsAny<MockCallArgs>()))
            .ReturnsAsync((MockCallArgs args) => args.Args);
        return Deployment.TestAsync<T>(mocks.Object, new TestOptions { IsPreview = false });
    }
}

So it sort of works, it does return the resource properties, but the resource name is null

I guess you’d need to set it manually in the callback. Was it working in 2.0?

Yeah it was

Which resources are you testing? Azure Native? Was it also Azure Native in 2.0?