public void Given_PostalCodeTaxResolver_Should_StartWith_4TaxCalculators()
{
//-------------------Setup---------------------------------------
//--------------------Execute------------------------------------
var postalTaxResolver = new PostalCodeTaxResolver(new Mock <IIncomeValidator>().Object);
//--------------------Assert-------------------------------------
Assert.AreEqual(4, postalTaxResolver.Count());
Assert.IsInstanceOf <ProgressiveTaxCalculator>(postalTaxResolver.GetTaxCalculator("7441"));
Assert.IsInstanceOf <FlatValueTaxCalculator>(postalTaxResolver.GetTaxCalculator("A100"));
Assert.IsInstanceOf <FlatRateTaxCalculator>(postalTaxResolver.GetTaxCalculator("7000"));
Assert.IsInstanceOf <ProgressiveTaxCalculator>(postalTaxResolver.GetTaxCalculator("1000"));
}
public void Given_GetTaxCalculator_When_Id_Does_Exist_Should_ReturnTaxCalculator()
{
//------------Setup---------------------------------
var taxCalculator = new FlatRateTaxCalculator(new Mock <IIncomeValidator>().Object);
const string identifier = "Flat Rate";
var taxResolver = new PostalCodeTaxResolver(new Mock <IIncomeValidator>().Object);
taxResolver.RegisterTaxCalculator(identifier, taxCalculator);
//------------Execute--------------------------------
var returnedTaxCalculator = taxResolver.GetTaxCalculator(identifier);
//------------Assert--------------------------------
Assert.AreEqual(taxCalculator, returnedTaxCalculator);
}
public void Given_GetTaxCalculator_When_Id_DoesNot_Exist_Should_ThrowException()
{
//------------Setup---------------------------------
var taxCalculator = new FlatRateTaxCalculator(new Mock <IIncomeValidator>().Object);
const string identifier = "Flat Rate";
var taxResolver = new PostalCodeTaxResolver(new Mock <IIncomeValidator>().Object);
taxResolver.RegisterTaxCalculator(identifier, taxCalculator);
//------------Execute--------------------------------
try
{
taxResolver.GetTaxCalculator("SomeRandomTaxCalculator");
}
catch (System.Exception e)
{
//------------Assert--------------------------------
Assert.AreEqual("No Tax Calculator found", e.Message);
}
}