tests(LRUDict): Add failing test

Author: Michael Brewer

Diff for: tests/unit/test_lru_cache.py

@@ -56,3 +56,14 @@ def test_setitem_moves_to_end(populated_cache):
 
     assert last_item == f"key_{random_value}"
     assert populated_cache[f"key_{random_value}"] == f"new_val_{random_value}"
+
+
+def test_lru_pop_failing():
+    cache = LRUDict()
+    key = "test"
+    cache[key] = "value"
+    try:
+        cache.pop(key, None)
+        pytest.fail("GitHub #300: LRUDict pop bug has been fixed :)")
+    except KeyError as e:
+        assert e.args[0] == key