public void GetTax_WhenBothAmountAndLowerBoundAreZero_ReturnZero()
{
var taxBand = TaxBand.Create(20, "band1");
var tax = taxBand.GetTax(0, 0);
tax.Should().Be(0);
}
public void GetTax_WhenUpperBoundIsNull_ReturnsProductOfRateAndDifferenceOfAmountAndLowerBound()
{
var taxBand = TaxBand.Create(20, "band1");
var tax = taxBand.GetTax(2000m, 10000m);
tax.Should().Be((10000m - 2000) * (20 / 100m));
}
public void GetTax_WhenLowerBoundLargerThanAmount_ReturnZero(decimal lowerBound, decimal amount)
{
var taxBand = TaxBand.Create(20, "band1", 10000);
var tax = taxBand.GetTax(lowerBound, amount);
tax.Should().Be(0);
}
public void GetTax_WhenAmountLargerThanUpperBound_ReturnsProductOfRateAndDifferenceOfUpperBoundAndLowerBound()
{
var taxBand = TaxBand.Create(20, "band1", 10000);
var tax = taxBand.GetTax(2000, 12000);
tax.Should().Be((10000m - 2000) * (20 / 100m));
}
public void GetTax_WhenAmountLessThanOrEqualToUpperBound_ReturnsProductOfRateAndDifferenceOfAmountAndLowerBound(decimal amount)
{
var taxBand = TaxBand.Create(20, "band1", 10000);
var tax = taxBand.GetTax(2000, amount);
tax.Should().Be((amount - 2000) * (20 / 100m));
}
public void CompareTo_Test(decimal?upperBound1, decimal?upperBound2, int expectedResult)
{
var taxBand1 = TaxBand.Create(20, "band1", upperBound1);
var taxBand2 = TaxBand.Create(20, "band2", upperBound2);
var result = taxBand1.CompareTo(taxBand2);
result.Should().Be(expectedResult);
}
public void IntegrationTest_WithMockProvider()
{
(var taxBandProviderMock, _, _) = GetMocks();
var band1 = TaxBand.Create(0, "band1", 12_500m);
var band2 = TaxBand.Create(20, "band2", 50_000m);
var band3 = TaxBand.Create(40, "band3", 150_000m);
var band4 = TaxBand.Create(45, "band4");
var taxBands = new List <TaxBand>()
{
band1, band2, band3, band4
};
taxBandProviderMock.Setup(x => x.GetAll()).Returns(taxBands);
var service = new CalculateTaxService(taxBandProviderMock.Object, new TaxBandHelper());
(var tax, _) = service.GetTax(52_000m);
tax.Should().Be(8_300m);
}
public void GetTax_WhenLowerBoundLessThanZero_ThrowError()
{
var taxBand = TaxBand.Create(20, "band1");
taxBand.Invoking(x => x.GetTax(-1m, 1m)).Should().Throw <InvalidOperationException>();
}