Workshop tasks

[yurynix]

1. Complete game winning logic: write unit tests for the different game winning scenarios (all rows, columns/diagonals/tie).
2. Write a component test verifiying a user cannot press a non empty cell.
3. Write a component test for a tie (show a "It's a tie!" message).
4. Write a browser/component test for marking next user in a special color (show 'X' and 'O' users and mark next user in special color).
5. Write a browser/component test for hiding registration form after game starts.
6. Write a browser/component test for hiding game board before game starts.
7. Bonus: Write a browser test for user saving / loading existing game state (use local storage for that)
8. Bonus: Write a browser test for displaying the number of wins next to each user: Win a game. Press a "new game" button, and win the game again. (Use local storage for that as well)