public void Reading()
{
var buffer = new ConsoleInputBuffer();
buffer.Insert("abcd");
buffer.Read(0).Should().BeEmpty();
buffer.Read(1).Should().ContainInOrder('a');
buffer.Read(2).Should().ContainInOrder('a', 'b');
buffer.Read(3).Should().ContainInOrder('a', 'b', 'c');
buffer.Read(4).Should().ContainInOrder('a', 'b', 'c', 'd');
((Action)(() => buffer.Read(5))).ShouldThrow<ArgumentException>();
}
