Robot practice for TDD

It's been long since I have practiced TDD in true spirit. This is an attempt to do it.

Thanks to this repo

Problem definition

A Robot is placed at an initial location in a hypothetical infinite grid. It is capable of moving in specific directions and letting you know its position. Here are the things that it can do -

• It can receive some directions to move in the grid
  • Directions could be LEFT / RIGHT / UP / DOWN. A sample direction input is LLRRUUD
• On receiving a direction, it changes its position
• It can also move in just one direction, Left Or Right or Up or Down
• It lets you ask its final position in (x,y) format