I have a controller action that use multi mediator, but I don't know to how can I write unit test for this action. help me please

var userObject = await _mediator.Send(new CreateUserCommand(contract),                
            cancellationToken);
var productObject = await _mediator.Send(new CreateProductCommand(contract), 
           cancellationToken);
var userProductObject = await _mediator.Send(new GetUserProductQuery(contract), 
           cancellationToken);