commit fd52afd1928643a715202147b1ce5b0d130ec252
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Tue Sep 28 05:56:52 2021 -0700
committer GitHub <noreply@github.com> Tue Sep 28 05:56:52 2021 -0700
tree 28a65cc5dc175d275bf70eb3a1b036af453b37bd
parent acd46feff3c06d3f1d00ab850e530c519445a737

bpo-35606: Fix math.prod tests using 'start' as keyword parameter (GH-28595)

(cherry picked from commit 84975146a7ce64f1d50dcec8311b7f7188a5c962)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>

Lib/test/test_math.py

diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
index 3d12874..e5f4e2b 100644
--- a/Lib/test/test_math.py
+++ b/Lib/test/test_math.py
@@ -1783,16 +1783,22 @@ def test_prod(self):
         self.assertRaises(TypeError, prod)
         self.assertRaises(TypeError, prod, 42)
         self.assertRaises(TypeError, prod, ['a', 'b', 'c'])
-        self.assertRaises(TypeError, prod, ['a', 'b', 'c'], '')
-        self.assertRaises(TypeError, prod, [b'a', b'c'], b'')
+        self.assertRaises(TypeError, prod, ['a', 'b', 'c'], start='')
+        self.assertRaises(TypeError, prod, [b'a', b'c'], start=b'')
         values = [bytearray(b'a'), bytearray(b'b')]
-        self.assertRaises(TypeError, prod, values, bytearray(b''))
+        self.assertRaises(TypeError, prod, values, start=bytearray(b''))
         self.assertRaises(TypeError, prod, [[1], [2], [3]])
         self.assertRaises(TypeError, prod, [{2:3}])
-        self.assertRaises(TypeError, prod, [{2:3}]*2, {2:3})
-        self.assertRaises(TypeError, prod, [[1], [2], [3]], [])
+        self.assertRaises(TypeError, prod, [{2:3}]*2, start={2:3})
+        self.assertRaises(TypeError, prod, [[1], [2], [3]], start=[])
+
+        # Some odd cases
+        self.assertEqual(prod([2, 3], start='ab'), 'abababababab')
+        self.assertEqual(prod([2, 3], start=[1, 2]), [1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2])
+        self.assertEqual(prod([], start={2: 3}), {2:3})
+
         with self.assertRaises(TypeError):
-            prod([10, 20], [30, 40])     # start is a keyword-only argument
+            prod([10, 20], 1)     # start is a keyword-only argument
 
         self.assertEqual(prod([0, 1, 2, 3]), 0)
         self.assertEqual(prod([1, 0, 2, 3]), 0)