1 files changed, 111 insertions, 0 deletions
diff --git a/test/test_collections.py b/test/test_collections.py
new file mode 100644
index 0000000..f8275e0
--- /dev/null
+++ b/test/test_collections.py
@@ -0,0 +1,111 @@
+import unittest
+
+from urllib3._collections import RecentlyUsedContainer as Container
+from urllib3.packages import six
+xrange = six.moves.xrange
+
+class TestLRUContainer(unittest.TestCase):
+    def test_maxsize(self):
+        d = Container(5)
+
+        for i in xrange(5):
+            d[i] = str(i)
+
+        self.assertEqual(len(d), 5)
+
+        for i in xrange(5):
+            self.assertEqual(d[i], str(i))
+
+        d[i+1] = str(i+1)
+
+        self.assertEqual(len(d), 5)
+        self.assertFalse(0 in d)
+        self.assertTrue(i+1 in d)
+
+    def test_expire(self):
+        d = Container(5)
+
+        for i in xrange(5):
+            d[i] = str(i)
+
+        for i in xrange(5):
+            d.get(0)
+
+        # Add one more entry
+        d[5] = '5'
+
+        # Check state
+        self.assertEqual(list(d.keys()), [0, 2, 3, 4, 5])
+
+    def test_pruning(self):
+        d = Container(5)
+
+        for i in xrange(5):
+            d[i] = str(i)
+
+        # Contend 2 entries for the most-used slot to balloon the heap
+        for i in xrange(100):
+            d.get(i % 2)
+
+        self.assertTrue(len(d.access_log) <= d.CLEANUP_FACTOR * d._maxsize)
+
+    def test_same_key(self):
+        d = Container(5)
+
+        for i in xrange(10):
+            d['foo'] = i
+
+        self.assertEqual(list(d.keys()), ['foo'])
+
+        d._prune_invalidated_entries()
+
+        self.assertEqual(len(d.access_log), 1)
+
+    def test_access_ordering(self):
+        d = Container(5)
+
+        for i in xrange(10):
+            d[i] = True
+
+        self.assertEqual(d._get_ordered_access_keys(), [9,8,7,6,5])
+
+        new_order = [7,8,6,9,5]
+        for k in reversed(new_order):
+            d[k]
+
+        self.assertEqual(d._get_ordered_access_keys(), new_order)
+
+    def test_delete(self):
+        d = Container(5)
+
+        for i in xrange(5):
+            d[i] = True
+
+        del d[0]
+        self.assertFalse(0 in d)
+
+        d.pop(1)
+        self.assertFalse(1 in d)
+
+        d.pop(1, None)
+
+    def test_get(self):
+        d = Container(5)
+
+        for i in xrange(5):
+            d[i] = True
+
+        r = d.get(4)
+        self.assertEqual(r, True)
+
+        r = d.get(5)
+        self.assertEqual(r, None)
+
+        r = d.get(5, 42)
+        self.assertEqual(r, 42)
+
+        self.assertRaises(KeyError, lambda: d[5])
+
+
+if __name__ == '__main__':
+    unittest.main()