From fea3466093936116d57606b0e5083f5d1121f146 Mon Sep 17 00:00:00 2001
From: Yury Selivanov <yury@magic.io>
Date: Sun, 1 Apr 2018 18:01:18 -0400
Subject: Implement Map.__hash__

---
 tests/test_map.py | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'tests/test_map.py')

diff --git a/tests/test_map.py b/tests/test_map.py
index 06c82b9..91050a2 100644
--- a/tests/test_map.py
+++ b/tests/test_map.py
@@ -757,6 +757,33 @@ class MapTest(unittest.TestCase):
         self.assertTrue(repr(h).startswith(
             '<immutables.Map({{...}: 1}) at 0x'))
 
+    def test_hash_1(self):
+        h = Map()
+        self.assertNotEqual(hash(h), -1)
+        self.assertEqual(hash(h), hash(h))
+
+        h = h.set(1, 2).set('a', 'b')
+        self.assertNotEqual(hash(h), -1)
+        self.assertEqual(hash(h), hash(h))
+
+        self.assertEqual(
+            hash(h.set(1, 2).set('a', 'b')),
+            hash(h.set('a', 'b').set(1, 2)))
+
+    def test_hash_2(self):
+        h = Map()
+        A = HashKey(100, 'A')
+
+        m = h.set(1, 2).set(A, 3).set(3, 4)
+        with self.assertRaises(HashingError):
+            with HaskKeyCrasher(error_on_hash=True):
+                hash(m)
+
+        m = h.set(1, 2).set(2, A).set(3, 4)
+        with self.assertRaises(HashingError):
+            with HaskKeyCrasher(error_on_hash=True):
+                hash(m)
+
 
 if __name__ == "__main__":
     unittest.main()
-- 
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