[2.0.x] Refs #28814 -- Fixed test_runner failure on Python 3.7.

Due to https://bugs.python.org/issue30399.

Backport of 9d1d3b2d2fe0bef995b024368088eeabbdf73629 from master

1 files changed, 4 insertions, 2 deletions

diff --git a/tests/test_runner/test_parallel.py b/tests/test_runner/test_parallel.py
index 0b575a606a..5892532e24 100644
--- a/tests/test_runner/test_parallel.py
+++ b/tests/test_runner/test_parallel.py
@@ -1,3 +1,4 @@
+import sys
 import unittest
 
 from django.test import SimpleTestCase
@@ -79,7 +80,8 @@ class RemoteTestResultTest(SimpleTestCase):
         event = events[1]
         self.assertEqual(event[0], 'addSubTest')
         self.assertEqual(str(event[2]), 'dummy_test (test_runner.test_parallel.SampleFailingSubtest) (index=0)')
-        self.assertEqual(repr(event[3][1]), "AssertionError('0 != 1',)")
+        trailing_comma = '' if sys.version_info >= (3, 7) else ','
+        self.assertEqual(repr(event[3][1]), "AssertionError('0 != 1'%s)" % trailing_comma)
 
         event = events[2]
-        self.assertEqual(repr(event[3][1]), "AssertionError('2 != 1',)")
+        self.assertEqual(repr(event[3][1]), "AssertionError('2 != 1'%s)" % trailing_comma)