TDD the Chess\Eval\ActivityEval class

[programarivm]

A few recently added tests are now refuting Blab's theorem of chess oscillations:

• tests/unit/SanSignalTest.php

More specifically:

• 1.a4 h5
• 1.a4 a5

This is due to a lack of evaluation features that still need to be implemented.

• 🛰 Blab's theorem of chess oscillations #698

In order to fix these exceptions, a new evaluation feature called Activity needs to be implemented in the php-chess/src/Eval folder. The PHPUnit tests are to be written in the php-chess/tests/unit/Eval/ActivityEvalTest.php file accordingly.

The activity of a piece is the number of squares it can move to in the next turn — not to confuse with Space, the number of squares controlled by each player.

See:

• Glossary of chess

active: Describes a piece that threatens a number of squares, or that has a number of squares available for its next move. It may also describe an aggressive style of play.