Use Scalacheck for testing pgn parser about scalachess

[lenguyenthanh]

The idea is we want to generate valid PGN string and parse it using scalacheck. And the way to do it is generate it's AST a.k. San.

We are already using this technique in some places: BitboardTest, ByColorTest.

But I'm not sure what is the best way to generate those PGN, like if we use legalMoves to generate those, it can be slow, if not the generated PGN can be illegal (but still valid). And do we really care if generated PGNs are legal or not.

[lenguyenthanh]

Can someone please assign me to this!

[Oziomajnr]

Do you mind explaining this a little more? Why do we an AST to test PGN parser?