Revert "Restructure {reasoning_gym, tests}/{core, exercises, curricula}"

This reverts commit 10dbb374b0.

tests/test_rubiks_cube.py

@@ -0,0 +1,59 @@
+import pytest
+
+from reasoning_gym.cognition.rubiks_cube import RubiksCubeConfig, RubiksCubeDataset
+
+
+def test_rubikscube_config_validation():
+    """Test that invalid configs raise appropriate errors"""
+    with pytest.raises(AssertionError):
+        config = RubiksCubeConfig(cube_size=1)  # Too small
+        config.validate()
+
+    with pytest.raises(AssertionError):
+        config = RubiksCubeConfig(scramble_steps=0)  # Don't give an unscrambled cube
+        config.validate()
+
+
+def test_rubikscube_deterministic():
+    """Test that dataset generates same items with same seed"""
+    config = RubiksCubeConfig(seed=42, size=15)  # Only check first 15 entries for speed
+    dataset1 = RubiksCubeDataset(config)
+    dataset2 = RubiksCubeDataset(config)
+    assert len(dataset1) == 15
+    assert len(dataset2) == 15
+
+    for i in range(len(dataset1)):
+        assert dataset1[i] == dataset2[i]
+
+
+def test_rubikscube_items():
+    """Test basic properties and solution of generated items"""
+    config = RubiksCubeConfig(
+        cube_size=3,
+        scramble_steps=4,
+        size=100,
+    )
+    dataset = RubiksCubeDataset(config)
+
+    for item in dataset:
+        assert isinstance(item, dict)
+        assert "question" in item
+        assert "answer" in item
+        assert "metadata" in item
+
+        # Check metadata contains required fields
+        assert "cube_size" in item["metadata"]
+        assert "cube_size" in item["metadata"]
+        assert "scramble_steps" in item["metadata"]
+        assert "scramble_moves" in item["metadata"]
+        assert "example_correct_answer" in item["metadata"]
+
+        assert dataset.score_answer(answer=item["metadata"]["example_correct_answer"], entry=item) == 1.0
+        assert dataset.score_answer(answer="a wrong solution", entry=item) == 0.01
+        assert dataset.score_answer(answer=None, entry=item) == 0.0
+
+        if item["metadata"]["example_correct_answer"] != "R":
+            assert dataset.score_answer(answer="R", entry=item) == 0.05
+
+        if len(item["metadata"]["example_correct_answer"]) > 0:
+            assert dataset.score_answer(answer="", entry=item) == 0.01