1 files changed, 50 insertions, 0 deletions
diff --git a/tests/test_lfu.py b/tests/test_lfu.py
new file mode 100644
index 0000000..6679a88
--- /dev/null
+++ b/tests/test_lfu.py
@@ -0,0 +1,50 @@
+import unittest
+
+from cachetools import LFUCache
+
+from . import CacheTestMixin
+
+
+class LFUCacheTest(unittest.TestCase, CacheTestMixin):
+
+    Cache = LFUCache
+
+    def test_lfu(self):
+        cache = LFUCache(maxsize=2)
+
+        cache[1] = 1
+        cache[1]
+        cache[2] = 2
+        cache[3] = 3
+
+        self.assertEqual(len(cache), 2)
+        self.assertEqual(cache[1], 1)
+        self.assertTrue(2 in cache or 3 in cache)
+        self.assertTrue(2 not in cache or 3 not in cache)
+
+        cache[4] = 4
+        self.assertEqual(len(cache), 2)
+        self.assertEqual(cache[4], 4)
+        self.assertEqual(cache[1], 1)
+
+    def test_lfu_getsizeof(self):
+        cache = LFUCache(maxsize=3, getsizeof=lambda x: x)
+
+        cache[1] = 1
+        cache[2] = 2
+
+        self.assertEqual(len(cache), 2)
+        self.assertEqual(cache[1], 1)
+        self.assertEqual(cache[2], 2)
+
+        cache[3] = 3
+
+        self.assertEqual(len(cache), 1)
+        self.assertEqual(cache[3], 3)
+        self.assertNotIn(1, cache)
+        self.assertNotIn(2, cache)
+
+        with self.assertRaises(ValueError):
+            cache[4] = 4
+        self.assertEqual(len(cache), 1)
+        self.assertEqual(cache[3], 3)