public void FibonacciLoop_NumberIs6_ShouldReturn8()
{
// Arrange
NumbersUtility numbersUtility = new NumbersUtility();
// Act
var result = numbersUtility.FibonacciLoop(6);
// Assert
Assert.AreEqual(8, result);
}
public void FibonacciLoop_NumberIsNegative_ShouldThrowInvalidOperationException()
{
// Arrange
NumbersUtility numbersUtility = new NumbersUtility();
// Act
Action action = () => numbersUtility.FibonacciLoop(-1);
// Assert
Assert.ThrowsException <InvalidOperationException>(action);
}