Issue #10990: Prevent tests from clobbering a set trace function.
Many tests simply didn't care if they unset a pre-existing trace function. This
made test coverage impossible. This patch fixes various tests to put back any
pre-existing trace function. It also introduces test.support.no_tracing as a
decorator which will temporarily unset the trace function for tests which
simply fail otherwise.
Thanks to Kristian Vlaardingerbroek for helping to find the cause of various
trace function unsets.
diff --git a/Lib/test/test_richcmp.py b/Lib/test/test_richcmp.py
index f8f3717..0b629dc 100644
--- a/Lib/test/test_richcmp.py
+++ b/Lib/test/test_richcmp.py
@@ -220,6 +220,7 @@
for func in (do, operator.not_):
self.assertRaises(Exc, func, Bad())
+ @support.no_tracing
def test_recursion(self):
# Check that comparison for recursive objects fails gracefully
from collections import UserList