public ShopService(IDbDriver dbDriver, ILogger logger) { this.dbDriver = dbDriver; this.logger = logger; article1 = new Article(1, "Article 1 from supplier 1", 458); article2 = new Article(2, "Article 2 from supplier 2", 459); article3 = new Article(3, "Article 3 from supplier 3", 460); article4 = new Article(1, "Article 1 from supplier 3", 457); supplier1 = new Supplier(1); dbDriver.SaveSupplier(supplier1); dbDriver.SaveArticle(supplier1, article1); supplier2 = new Supplier(2); dbDriver.SaveSupplier(supplier2); dbDriver.SaveArticle(supplier2, article2); supplier3 = new Supplier(3); dbDriver.SaveSupplier(supplier3); dbDriver.SaveArticle(supplier3, article3); dbDriver.SaveArticle(supplier3, article4); }