add rectangle count dataset

tests/test_rectangle_count.py

@@ -0,0 +1,19 @@
+import pytest
+
+from reasoning_gym.cognition.rectangle_count import RectangleCountConfig, RectangleCountDataset
+
+
+def test_dice():
+    """Test basic properties and solution of generated items"""
+    config = RectangleCountConfig(seed=42, size=50, max_rectangles=15, width=40, height=40)
+    dataset = RectangleCountDataset(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