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_pdb.py b/Lib/test/test_pdb.py
index d861df5..c197aff 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -20,9 +20,12 @@
def __enter__(self):
self.real_stdin = sys.stdin
sys.stdin = _FakeInput(self.input)
+ self.orig_trace = sys.gettrace() if hasattr(sys, 'gettrace') else None
def __exit__(self, *exc):
sys.stdin = self.real_stdin
+ if self.orig_trace:
+ sys.settrace(self.orig_trace)
def test_pdb_displayhook():