public void IsDrugInStock_True()
        {
            // Arrange
            Drug drug = new Drug("Ibuprophen");
            Fakes.FakeStockProvider stockProvider = new Fakes.FakeStockProvider(1);

            Stock stock = new Stock(stockProvider);

            // Act
            bool isDrugInStock = stock.IsDrugInStock(drug);

            // Assert
            Assert.That(isDrugInStock, Is.True);
        }