public void GetNext_ShouldBeReturnTheCharValue(string text, char firstChar)
{
var myStream = new MyStream(text);
Assert.Equal(firstChar, myStream.getNext());
}
public void GetNext_ShouldBeThrowIndexOutOfRangeException()
{
var myStream = new MyStream(string.Empty);
Assert.Throws <IndexOutOfRangeException>(() => myStream.getNext());
}