1 files changed, 50 insertions, 0 deletions
diff --git a/tests/test_mru.py b/tests/test_mru.py
new file mode 100644
index 0000000..d11dba4
--- /dev/null
+++ b/tests/test_mru.py
@@ -0,0 +1,50 @@
+import unittest
+
+from cachetools import MRUCache
+
+from . import CacheTestMixin
+
+
+class MRUCacheTest(unittest.TestCase, CacheTestMixin):
+
+    Cache = MRUCache
+
+    def test_evict__writes_only(self):
+        cache = MRUCache(maxsize=2)
+
+        cache[1] = 1
+        cache[2] = 2
+        cache[3] = 3  # Evicts 1 because nothing's been used yet
+
+        assert len(cache) == 2
+        assert 1 not in cache, "Wrong key was evicted. Should have been '1'."
+        assert 2 in cache
+        assert 3 in cache
+
+    def test_evict__with_access(self):
+        cache = MRUCache(maxsize=2)
+
+        cache[1] = 1
+        cache[2] = 2
+        cache[1]
+        cache[2]
+        cache[3] = 3  # Evicts 2
+        assert 2 not in cache, "Wrong key was evicted. Should have been '2'."
+        assert 1 in cache
+        assert 3 in cache
+
+    def test_evict__with_delete(self):
+        cache = MRUCache(maxsize=2)
+
+        cache[1] = 1
+        cache[2] = 2
+        del cache[2]
+        cache[3] = 3  # Doesn't evict anything because we just deleted 2
+
+        assert 2 not in cache
+        assert 1 in cache
+
+        cache[4] = 4  # Should evict 1 as we just accessed it with __contains__
+        assert 1 not in cache
+        assert 3 in cache
+        assert 4 in cache