❌ tic tak toe ⭕

Is a good problem to work through during learn tech as it touches on:

• TDD Skill
• ATDD
• (Clean) Architecture
• SOLID Principles

Requirements

Using the discipline of TDD, build a game of tic tac toe.

• The game should allow a human to play against an AI.
• The AI should be unbeatable.
• The game should have a user interface of some kind.

Rules

1. The game is played on a 3x3 grid.

2. You are X, your opponent is O. Players take turns putting their marks in empty squares.

3. The first player to get 3 of their marks in a row (up, down, across, or diagonally) is the winner.

4. If all 9 squares are full and no player has 3 marks in a row, the game is over.

Mod session with Craig

• Test doubles
  • Fakes - InMemory
  • Spies - to have_received(..)
  • Stub - double(game: …)
• Acceptance Testing
• Clean Architecture
  • Request response hashes for use cases
• Mutable domain object gateway(game)
• Micro-design decisions + evolving architecture
  • Discussed difference between 2grid vs flat array
  • Discussed difference between positions vs coordinates x,y vs coordinates tuple
• Different data in acceptance tests vs unit tests
• Making note of unfinished stuff to come back to
• Lots of files (major drawback)