public void CalculateIncomeTax_ShouldThrowArgumentException_IfGrossSalaryIsNegative()
{
//Arrange
double grossSalaryNegative = -1;
IncomeTaxCalculator incomeTaxCalculator = new IncomeTaxCalculator();
//Action
var exception = Assert.Throws <ArgumentException>(() => incomeTaxCalculator.CalculateIncomeTax(grossSalaryNegative));
//Assert
Assert.That(exception.Message, Is.EqualTo(GlobalConstants.NegativeGrossSalaryMessage));
}
public void CalculateIncomeTax_ShouldReturnValidIncomeTax_IfGrossSalaryIsAboveMinGrossSalary()
{
//Arrange
IncomeTaxCalculator incomeTaxCalculator = new IncomeTaxCalculator();
double grossSalaryAboveMinGrossSalary = GlobalConstants.MinGrossSalary + 1;
double expectedIncomeTax = (grossSalaryAboveMinGrossSalary - GlobalConstants.MinGrossSalary) * GlobalConstants.IncomeTaxPercent / 100;
//Action
double resultIncomeTax = incomeTaxCalculator.CalculateIncomeTax(grossSalaryAboveMinGrossSalary);
//Assert
Assert.AreEqual(expectedIncomeTax, resultIncomeTax, $"Result income tax was not equal to {expectedIncomeTax}");
}
public void CalculateIncomeTax_ShouldReturn0_IfGrossSalaryIsBelowOrMinGrossSalary()
{
//Arrange
IncomeTaxCalculator incomeTaxCalculator = new IncomeTaxCalculator();
double grossSalaryBelowOrMin = GlobalConstants.MinGrossSalary - 1;
double expectedIncomeTax = 0;
//Action
double resultIncomeTax = incomeTaxCalculator.CalculateIncomeTax(grossSalaryBelowOrMin);
//Assert
Assert.AreEqual(expectedIncomeTax, resultIncomeTax, $"Result income tax was not equal to {expectedIncomeTax}");
}