public void Previous_ShouldReturnPreviousIndex()
{
// Assign
var list = new CircularList<int>(GetNumbers());
// Act
int current = list.Current;
int next0 = list.Previous();
int next1 = list.Previous();
int next2 = list.Previous();
int next3 = list.Previous();
int next4 = list.Previous();
int next5 = list.Previous();
int next6 = list.Previous();
// Assert
Assert.AreEqual(0, current);
Assert.AreEqual(4, next0);
Assert.AreEqual(3, next1);
Assert.AreEqual(2, next2);
Assert.AreEqual(1, next3);
Assert.AreEqual(0, next4);
Assert.AreEqual(4, next5);
Assert.AreEqual(3, next6);
}