I have this Azure Function orchestrator

using Microsoft.Azure.Functions.Worker;
using Microsoft.DurableTask;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace Functions.Triggers.Orchestration.StudentEnrollments
{
    public class SimpleOrchestrator
    {
        [Function("O_Simple")]
        public async Task<bool> RunAsync([OrchestrationTrigger] TaskOrchestrationContext ctx)
        {
            var aTest = await ctx.CallHttpAsync(HttpMethod.Get, new Uri("https://learn.microsoft.com/en-us/azure/azure-functions/dotnet-isolated-process-guide?tabs=linux"));

            if (aTest.StatusCode == System.Net.HttpStatusCode.OK)
            {
                return true;
            }

            return false;
        }
    }
}

And this test

using Microsoft.Azure.Functions.Worker.Extensions.DurableTask.Http;
using Microsoft.DurableTask;
using Moq;
using Functions.Triggers.Orchestration.StudentEnrollments;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Xunit;

namespace tests.UnitTests
{
    public class SimpleTest
    {
        [Fact]
        public async Task Test_SimpleTestOrchestrator()
        {
            var test = new SimpleOrchestrator();
            var mockContext = new Mock<TaskOrchestrationContext>();
            mockContext
                .Setup(x => x.CallHttpAsync(HttpMethod.Get, new Uri("https://learn.microsoft.com/en-us/azure/azure-functions/dotnet-isolated-process-guide?tabs=linux"), null, null))
                .ReturnsAsync(new DurableHttpResponse(System.Net.HttpStatusCode.OK));
            var sut = await test.RunAsync(mockContext.Object);
            Assert.True(sut);
        }
    }
}

I get the error

System.NotSupportedException : Unsupported expression: x => x.CallHttpAsync(HttpMethod.Get, ltiUserGetUrl, null, null) Extension methods (here: TaskOrchestrationContextExtensionMethods.CallHttpAsync) may not be used in setup / verification expressions.

This is how I was able to mock CallHttpAsync for the in process model but I can’t seem to find out how to do it for .net isolated.