public async Task GetMessageByIdHandler_ShouldReturnMessage_WhenMessageExists()
{
// Arrange
GetMessageByIdQuery request = new GetMessageByIdQuery {
MessageId = 1
};
IQueryable <Message> expectedMessage = new[]
{
new Message {
MessageId = 1
}
}
.AsQueryable()
.BuildMock()
.Object;
_unitOfWorkMock
.Setup(m => m.Messages.GetById(request.MessageId))
.Returns(expectedMessage);
GetMessageByIdQuery.Handler handler = new GetMessageByIdQuery.Handler(_mapperMock, _unitOfWorkMock.Object, _userProviderMock.Object);
// Act
MessageResource message = await handler.Handle(request);
// Assert
Assert.NotNull(message);
}
public async Task <ActionResult <MessageResource> > GetMessageById([FromRoute] int messageId, CancellationToken cancellationToken = default)
{
// Check if the message exists
MessageExistsQuery existsQuery = new MessageExistsQuery {
MessageId = messageId
};
bool exists = await _mediator.Send(existsQuery, cancellationToken);
if (!exists)
{
return(NotFound(new ErrorResource
{
StatusCode = StatusCodes.Status404NotFound,
Message = $"Message with ID '{messageId}' does not exist"
}));
}
// Check if the user is allowed to see the message
CanAccessMessageQuery canAccessQuery = new CanAccessMessageQuery {
MessageId = messageId
};
bool canAccess = await _mediator.Send(canAccessQuery, cancellationToken);
if (!canAccess)
{
return(StatusCode(StatusCodes.Status403Forbidden, new ErrorResource
{
StatusCode = StatusCodes.Status403Forbidden,
Message = "The user is not permitted to see this message. He may only see messages that he received or wrote himself"
}));
}
// Get the message
GetMessageByIdQuery fetchQuery = new GetMessageByIdQuery {
MessageId = messageId
};
MessageResource message = await _mediator.Send(fetchQuery, cancellationToken);
return(Ok(message));
}
