public async Task AddDocument_Valid_Test()
{
// Arrange
CityDocumentsViewModel document = new CityDocumentsViewModel();
_mapper
.Setup(m => m.Map <CityDocumentsViewModel, CityDocumentsDTO>(It.IsAny <CityDocumentsViewModel>()))
.Returns(new CityDocumentsDTO());
_cityDocumentsService
.Setup(c => c.AddDocumentAsync(It.IsAny <CityDocumentsDTO>()));
_logger
.Setup(l => l.LogInformation(It.IsAny <string>()));
CitiesController citycon = CreateCityController;
// Act
var result = await citycon.AddDocument(document);
// Assert
Assert.NotNull(result);
Assert.IsInstanceOf <OkObjectResult>(result);
}