I have the following Azure Function:

[Function("O_StudentEnrollmentUpdated")]
public async Task<bool> StudentEnrollmentUpdated(
    [OrchestrationTrigger] TaskOrchestrationContext ctx,
    StudentEnrollment studentEnrollment
)
{
    var log = ctx.CreateReplaySafeLogger("O_StudentEnrollmentUpdated");
    ...
    ...
    ...
}

I am attempting to write a test for this, but I get an Exception on the very first line of code:

System.NullReferenceException HResult=0x80004003 Message=Object
reference not set to an instance of an object.
Source=Microsoft.DurableTask.Abstractions StackTrace: at
Microsoft.DurableTask.TaskOrchestrationContext.CreateReplaySafeLogger(String
categoryName)

This is the test, I’m thinking something is wrong with the Mock, but unsure:

[Fact]
public async Task TestStudentEnrollmentUpdatedOrchestrator()
{

    var mockClient = new Mock<ServiceBusClient>();
    var taskContextMock = new Mock<TaskOrchestrationContext>();

    var _sut = new StudentEnrollmentUpdatedOrchestrator(mockClient.Object);
    StudentEnrollment se = new StudentEnrollment()
    {
        CourseId = 1,
        UserId = 2
    };
    var run = await _sut.StudentEnrollmentUpdated(taskContextMock.Object, se);
    Assert.True(run);
}

The documentation for testing isolated functions seems to be very lacking as of now so I’m having trouble figuring out what I’m doing wrong here.