public async Task CountShouldReturnCorrectCountOfPicturesByAdvertisementId()
{
// Arrange
var db = this.Context;
this.PopulateData(db);
var picturesService = new PictureService(db);
var advertisementId = 1;
// Act
var result = await picturesService.Count(advertisementId);
// Assert
result
.Should()
.Be(3);
}