commit 79fbcc597dfd039d3261fffcb519b5ec5a18df9d
author Raymond Hettinger <rhettinger@users.noreply.github.com> Sat Feb 23 22:19:01 2019 -0800
committer Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Sat Feb 23 22:19:01 2019 -0800
tree 9d56ae7f0a317d315533aac7ae2efd425a9efb05
parent e895de3e7f3cc2f7213b87621cfe9812ea4343f0

bpo-36018: Make __pos__ return a distinct instance of NormDist (GH-12009)



https://bugs.python.org/issue36018

Lib/test/test_statistics.py

diff --git a/Lib/test/test_statistics.py b/Lib/test/test_statistics.py
index a65fbe8..9549240 100644
--- a/Lib/test/test_statistics.py
+++ b/Lib/test/test_statistics.py
@@ -2128,6 +2128,18 @@
         with self.assertRaises(statistics.StatisticsError):
             Y.cdf(90)
 
+    def test_unary_operations(self):
+        NormalDist = statistics.NormalDist
+        X = NormalDist(100, 12)
+        Y = +X
+        self.assertIsNot(X, Y)
+        self.assertEqual(X.mu, Y.mu)
+        self.assertEqual(X.sigma, Y.sigma)
+        Y = -X
+        self.assertIsNot(X, Y)
+        self.assertEqual(X.mu, -Y.mu)
+        self.assertEqual(X.sigma, Y.sigma)
+
     def test_same_type_addition_and_subtraction(self):
         NormalDist = statistics.NormalDist
         X = NormalDist(100, 12)