public void ReturnsZero_If_InputIsEmpty()
{
var inverter = new CaptchaInverter(string.Empty);
var sum = inverter.GetSum();
sum.Should().Be(0);
}
public void Returns_Expected(string input, int expected)
{
var inverter = new CaptchaInverter(input);
var sum = inverter.GetSum();
sum.Should().Be(expected);
}
public void ReturnsDigit_If_InputContainsSameTwoDigits()
{
var inverter = new CaptchaInverter("11");
var sum = inverter.GetSum();
sum.Should().Be(2);
}
public void ReturnsDigit_If_InputContainsDifferentTwoDigits()
{
var inverter = new CaptchaInverter("12");
var sum = inverter.GetSum();
sum.Should().Be(0);
}
public void ReturnsDigit_If_InputContainsExactlyOneDigit()
{
var inverter = new CaptchaInverter("9");
var sum = inverter.GetSum();
sum.Should().Be(9);
}