public void ShouldCreateAIntersetCalculatorClass()
{
var intrestCalculator = new IntrestCalculator();
Assert.That(intrestCalculator, Is.Not.Null);
}
public void ShouldCalculateSimpleIntreset()
{
var intrestCalculator = new IntrestCalculator("SI");
string calculatedIntrest = intrestCalculator.CalculateIntrest();
Assert.That(calculatedIntrest, Is.EqualTo("SI"));
}