public void ReturnCharsInCorrectOrder() { var text = "abc"; var sut = new TextWindow(text); Assert.Equal('a', sut.PeekChar()); sut.ConsumeChar(); Assert.Equal('b', sut.PeekChar()); sut.ConsumeChar(); Assert.Equal('c', sut.PeekChar()); sut.ConsumeChar(); Assert.True(sut.IsEof()); }