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);
        }