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Approvals:
  Xqt: Looks good to me, approved
  jenkins-bot: Verified

[tests] Show a more informative message with failing test

TestTerminalOutput.test_exception_tb fails for Python 3.11.
Show additional information about the reason.

Bug: T297044
Change-Id: I924498656d0e419d6548d7e44e32690d7bce0f37
---
M tests/ui_tests.py
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/ui_tests.py b/tests/ui_tests.py
index 2718610..fc7c75f 100644
--- a/tests/ui_tests.py
+++ b/tests/ui_tests.py
@@ -212,7 +212,11 @@
         self.assertEqual(stderrlines[1], 'Traceback (most recent call last):')
         self.assertEqual(stderrlines[3],
                          "    raise TestExceptionError('Testing Exception')")
-        self.assertTrue(stderrlines[4].endswith(': Testing Exception'))
+        end_str = ': Testing Exception'
+        traceback_line = stderrlines[4]
+        self.assertTrue(traceback_line.endswith(end_str),
+                        '\n{!r} does not end with {!r}'
+                        .format(traceback_line, end_str))
 
         self.assertNotEqual(stderrlines[-1], '\n')

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