Add deepcopy coverage

Author: cmanallen

tests/test_lru_cache.py

@@ -1,5 +1,7 @@
 import pytest
 
+from copy import deepcopy
+
 from sentry_sdk._lru_cache import LRUCache
 
 
@@ -58,3 +60,29 @@ def test_cache_get_all():
     assert cache.get_all() == [(1, 1), (2, 2), (3, 3)]
     cache.get(1)
     assert cache.get_all() == [(2, 2), (3, 3), (1, 1)]
+
+
+def test_cache_copy():
+    cache = LRUCache(3)
+    cache.set(0, 0)
+    cache.set(1, 1)
+
+    copied = deepcopy(cache)
+    cache.set(2, 2)
+    cache.set(3, 3)
+    assert copied.get_all() == [(0, 0), (1, 1)]
+    assert cache.get_all() == [(1, 1), (2, 2), (3, 3)]
+
+    copied = deepcopy(cache)
+    cache.get(1)
+    assert copied.get_all() == [(1, 1), (2, 2), (3, 3)]
+    assert cache.get_all() == [(2, 2), (3, 3), (1, 1)]
+
+
+def test_cache_pollution():
+    cache1 = LRUCache(max_size=2)
+    cache1.set(1, True)
+    cache2 = deepcopy(cache1)
+    cache2.set(1, False)
+    assert cache1.get(1) is True
+    assert cache2.get(1) is False