public async Task GetAttachmentDetails_UnprocessableEntity()
{
// Arrange
int attachmentId = -1;
string expectedError = $"Invalid AttachmentId: {attachmentId}";
// Act
ActionResult <AttachmentItemModel> response = await _sut.GetAttachmentDetails(attachmentId);
// Assert
await _mockAttachmentsService.DidNotReceiveWithAnyArgs().RetrieveAsync(default);