how to set body for mock of ServiceBusReceivedMessage

I am trying to create mock for ServiceBusReceivedMessage with the body. How to do it?

I have data variable which I want to set as message body, how to do it?

var data = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(eventData));

var message = new Mock<ServiceBusReceivedMessage>().Object;
        
//message.Body;

I tried below code, compile no error, but while running giving error:

> System.NotSupportedException : Unsupported expression: x => x.Body
Non-overridable members (here: ServiceBusReceivedMessage.get_Body) may not be used in setup / verification expressions.

var mockMessage = new Mock<ServiceBusReceivedMessage>();
var messageBody = new BinaryData(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(eventData)));
mockMessage.Setup(x => x.Body).Returns(new BinaryData(messageBody));
var message = mockMessage.Object;

What's wrong here?

From what I understand, you want to create an instance of a class with specific data in it, for which I would recommend to use AutoFixture from Nuget store

Example:

var fixture = new Fixture();
var messageBody = new BinaryData(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(eventData)));
var mockedServiceBusReceivedMessage = fixture
    .Build<ServiceBusReceivedMessage>()
    .With(e => e.Body, messageBody)
    .Create();

If you want to avoid generating automatic data for other properties, add .OmitAutoProperties() before .Create().

If you want to use Moq for ServiceBusReceivedMessage, first you should create an interface for your class:

public interface IServiceBusReceivedMessage
{
    BinaryData Body { get; }
}

And then substitute your class to this interface:

public class ServiceBusReceivedMessage : IServiceBusReceivedMessage
{
    BinaryData Body { get; set; }
}

Then you could use IServiceBusReceivedMessage to setup mocked response for Body as in your example, but I doubt that you need to construct BinaryData from BinaryData, so it would probably be:

var mockMessage = new Mock<IServiceBusReceivedMessage>();
var messageBody = new BinaryData(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(eventData)));
mockMessage.Setup(x => x.Body).Returns(messageBody);
var message = mockMessage.Object;

And maybe I'm stating obvious here, but still will note this down:
Everywhere where there's ServiceBusReceivedMessage parameter, it should be changed to IServiceBusReceivedMessage for this new mocked object to be accepted.