Cleanup LRUCache, fix bug, add unit tests (pytest).

tests/test_lrucache.py

@@ -0,0 +1,55 @@
+import pytest
+from unittest.mock import Mock
+from time import sleep
+from cista.lrucache import LRUCache  # Replace with actual import
+
+def mock_open(key):
+    mock = Mock()
+    mock.close = Mock()
+    mock.content = f"content-{key}"
+    return mock
+
+def test_contains():
+    cache = LRUCache(open=mock_open, capacity=2, maxage=10)
+    assert "key1" not in cache
+    cache["key1"]
+    assert "key1" in cache
+
+def test_getitem():
+    cache = LRUCache(open=mock_open, capacity=2, maxage=10)
+    assert cache["key1"].content == "content-key1"
+
+def test_capacity():
+    cache = LRUCache(open=mock_open, capacity=2, maxage=10)
+    item1 = cache["key1"]
+    item2 = cache["key2"]
+    cache["key3"]
+    assert "key1" not in cache
+    item1.close.assert_called()
+
+def test_expiry():
+    cache = LRUCache(open=mock_open, capacity=2, maxage=0.1)
+    item = cache["key1"]
+    sleep(0.2)  # Wait for expiration
+    cache.expire_items()
+    assert "key1" not in cache
+    item.close.assert_called()
+
+def test_close():
+    cache = LRUCache(open=mock_open, capacity=2, maxage=10)
+    item = cache["key1"]
+    cache.close()
+    assert "key1" not in cache
+    item.close.assert_called()
+
+def test_lru_mechanism():
+    cache = LRUCache(open=mock_open, capacity=2, maxage=10)
+    item1 = cache["key1"]
+    item2 = cache["key2"]
+    cache["key1"]  # Make key1 recently used
+    cache["key3"]  # This should remove key2
+    assert "key1" in cache
+    assert "key2" not in cache
+    assert "key3" in cache
+    item2.close.assert_called()
+    item1.close.assert_not_called()