How to mock ProcessMessageEventArgs object to pass as a parameter in a method from a test method in c#

Question

I am writing a test method for below mention method -

Method in my concrete class -

public async Task ReadServiceBusMessage(ProcessMessageEventArgs args)
{
 // Some code

}

-- In my test method-

public async Test_ReadServiceBusMessage()
{
        private Mock<ProcessMessageEventArgs> _eventArgs;

        **_eventArgs = new Mock<ProcessMessageEventArgs>(MockBehavior.Strict);**

         await concreteClassObj.ReadServiceBusMessage(_eventArgs.Object);

}

this object creation (highighted in bold) is giving below exception message

Property ProcessMessageEventArgs.Message does not have a setter

Answer 1

You'll need to pass the message to the constructor. For example:

Mock<ServiceBusReceiver> mockReceiver = new();

mockReceiver
    .Setup(receiver => receiver.CompleteMessageAsync(
        It.IsAny<ServiceBusReceivedMessage>(),
        It.IsAny<CancellationToken>()))
    .Returns(Task.CompletedTask);

ServiceBusReceivedMessage message = ServiceBusModelFactory.ServiceBusReceivedMessage(
        body: new BinaryData("message"),
        messageId: "messageId",        
        /* << SNIP for brevity, more fields available >> */
);

ProcessMessageEventArgs processArgs = new(
    message: message,
    receiver: mockReceiver.Object,
    cancellationToken: CancellationToken.None);

More context and further examples can be found in the Mocking Client Types sample.