Sokoban without pygame (#77)

* add minified version of https://github.com/xbandrade/sokoban-solver-generator

---------

Co-authored-by: Rich Jones <miserlou@gmail.com>

tests/test_sokoban.py

@@ -0,0 +1,50 @@
+import pytest
+
+from reasoning_gym.games.sokoban import SokobanConfig, SokobanDataset
+
+
+def test_sokoban():
+    """Test basic properties and solution of generated items"""
+
+    # Easy
+    config = SokobanConfig(seed=42, size=20)
+    dataset = SokobanDataset(config)
+
+    for item in dataset:
+        assert isinstance(item, dict)
+        assert "question" in item
+        assert "answer" in item
+        assert "metadata" in item
+
+        # Test the scoring
+        assert dataset.score_answer(answer=item["answer"], entry=item) == 1.0
+        assert dataset.score_answer(answer="RU", entry=item) == 0.1
+        assert dataset.score_answer(answer=None, entry=item) == 0.0
+
+    # Medium
+    config = SokobanConfig(seed=42, min_h=40, max_h=50, min_w=40, max_w=50, min_boxes=20, max_boxes=30, size=3)
+    dataset = SokobanDataset(config)
+
+    for item in dataset:
+        assert isinstance(item, dict)
+        assert "question" in item
+        assert "answer" in item
+        assert "metadata" in item
+
+        # Test the scoring
+        assert dataset.score_answer(answer=item["answer"], entry=item) == 1.0
+        assert dataset.score_answer(answer=None, entry=item) == 0.0
+
+    # Hard
+    config = SokobanConfig(seed=42, min_h=400, max_h=500, min_w=400, max_w=500, min_boxes=50, max_boxes=50, size=1)
+    dataset = SokobanDataset(config)
+
+    for item in dataset:
+        assert isinstance(item, dict)
+        assert "question" in item
+        assert "answer" in item
+        assert "metadata" in item
+
+        # Test the scoring
+        assert dataset.score_answer(answer=item["answer"], entry=item) == 1.0
+        assert dataset.score_answer(answer=None, entry=item) == 0.0