public void CalculateIncomeTax_NoBaseTaxAmountSpecified_ReturnsTaxAmountOverMinIncome()
{
//= 7,491.25 / 12 months
//= 624.27083333333333333333333333333
// arrange, act & assert
TaxRate.Create(37001M, maxIncome: 87000M, rateValue: 0.325M)
.CalculateIncomeTax(60050M).ShouldBe(624M);
}
public void CalculateIncomeTax_RateForDollarsOverMinIncomeNotSpecified_ReturnsBaseTaxAmount()
{
// arrange
const decimal wholeBaseTaxAmountPerMonth = 298M;
// act & assert
TaxRate.Create(37001M, 87000M, baseTaxAmount: 3572M)
.CalculateIncomeTax(60050M)
.ShouldBe(wholeBaseTaxAmountPerMonth);
}
public void CalculateTaxAmountOverMinIncome_RateValueSet_ReturnsTaxOverMinIncome()
{
const decimal salary = 60050M;//$60,050
//(60,050 - 37,000) x 0.325
//
var taxRate = TaxRate.Create(37001M, 87000M, rateValue: 0.325M);
taxRate.CalculateTaxAmountOverMinIncome(salary)
.ShouldBe(7491.25M);
}
public void CalculateIncomeTax()
{
//$87,001 - $180,000 $19,822 plus 37c for each $1 over $87,000
TaxRate.Create(87001M, 180000M, 0.37M, 19822M).CalculateIncomeTax(120000M).ShouldBe(2669M);
TaxRate.Create(37001M, 87000M, 0.325M, 3572M).CalculateIncomeTax(60050M).ShouldBe(922M);
}
public void IsWithinIncomeRange_SalaryWithinRange_ReturnsTrue(decimal minIncome, decimal?maxIncome, decimal income, bool result)
{
TaxRate.Create(minIncome, maxIncome).IsWithinIncomeRange(income).ShouldBe(result);
}
public void Ctor_InvalidIncomeRanges_ThrowsArgumentOutOfRangeException()
{
Assert.Throws <ArgumentOutOfRangeException>(() => TaxRate.Create(-1M, 0M, 0M, 0M));
Assert.Throws <ArgumentOutOfRangeException>(() => TaxRate.Create(0M, -1M, 0M, 0M));
Assert.Throws <ArgumentOutOfRangeException>(() => TaxRate.Create(0M, -1M, -1M, 0M));
}
