public void What_is_previous_value_of_A() { ILearning a = new Alphabet('A'); string expected = "Z"; string actual = a.Previous(); Assert.AreEqual(expected, actual); }
public void What_is_NextLetter_after_Z() { ILearning a = new Alphabet('Z'); string expected = "A"; string actual = a.Next(); Assert.AreEqual(expected, actual); }