public void CalculateTax_ShouldReturn_Correct()
{
var grossSalary = 3400m;
var expectedResult = 540m;
var servicesCollection = new List <ITaxCalculator>
{
new SocialTaxService(),
new IncomeTaxService()
};
var salaryService = new SalaryService(servicesCollection);
var result = salaryService.CalculateTaxes(grossSalary);
Assert.AreEqual(expectedResult, result);
}