internal static void Main(string[] args)
{
// Setup the expectatons of the mock GST rate provider
MockRepository repository = new MockRepository();
IGstRateProvider provider = repository.CreateMock <IGstRateProvider>();
provider.GetGstRate("Bread").WillReturn(0.00M);
provider.GetGstRate("Milk").WillReturn(0.00M);
provider.DefaultGstRate.WillReturn(0.10M);
repository.ReplayAll();
// Test the GST Calculator using the mock provider (instead of, say, the database
// GST rate provider it would use in production).
GstCalculator calculator = new GstCalculator(provider);
Assert.AreEqual(2.57M, calculator.ApplyGst("Bread", 2.57M), "Bread should be exempt from GST");
Assert.AreEqual(4.00M, calculator.ApplyGst("Milk", 4.00M), "Milk should be exempt from GST");
Assert.AreEqual(2200M, calculator.ApplyGst("Laptop", 2000M), "Laptops should not be exempt from GST");
Assert.AreEqual(26400M, calculator.ApplyGst("Car", 24000M), "Cars should not be exempt from GST");
repository.VerifyAll();
Console.ReadKey();
}
/// <summary>
/// Applies the GST.
/// </summary>
public decimal ApplyGst(string product, decimal grossPrice)
{
decimal gstRate = _rateProvider.GetGstRate(product) ?? _rateProvider.DefaultGstRate;
return(grossPrice * (1.00M + gstRate));
}
