Issue #10992: make tests pass when run under coverage.
Various tests fail when run under coverage. A primary culprit is refcount tests
which fail as the counts are thrown off by the coverage code. A new decorator
-- test.support.refcount_test -- is used to decorate tests which test refcounts
and to skip them when running under coverage. Other tests simply fail because
of changes in the system (e.g., __local__ suddenly appearing).
Thanks to Kristian Vlaardingerbroek for helping to diagnose the test failures.
diff --git a/Lib/test/support.py b/Lib/test/support.py
index f037a7a..9300aae 100644
--- a/Lib/test/support.py
+++ b/Lib/test/support.py
@@ -1124,6 +1124,17 @@
return wrapper
+def refcount_test(test):
+ """Decorator for tests which involve reference counting.
+
+ To start, the decorator does not run the test if is not run by CPython.
+ After that, any trace function is unset during the test to prevent
+ unexpected refcounts caused by the trace function.
+
+ """
+ return no_tracing(cpython_only(test))
+
+
def _run_suite(suite):
"""Run tests from a unittest.TestSuite-derived class."""
if verbose: