public async Task ExistsShouldReturnBooleanDependsOfAdvertisment()
{
// Arrange
var db = this.Context;
this.PopulateData(db);
var advertisementsService = new AdvertisementService(db);
var advertisementId = 1;
// Act
var result = await advertisementsService.Exists(advertisementId);
// Assert
result
.Should()
.Be(true);
}