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-rw-r--r--Lib/test/libregrtest/runtest.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/libregrtest/runtest.py b/Lib/test/libregrtest/runtest.py
index fda4ca1..0210409 100644
--- a/Lib/test/libregrtest/runtest.py
+++ b/Lib/test/libregrtest/runtest.py
@@ -103,6 +103,9 @@ def runtest(ns, test):
faulthandler.dump_traceback_later(ns.timeout, exit=True)
try:
support.match_tests = ns.match_tests
+ # reset the environment_altered flag to detect if a test altered
+ # the environment
+ support.environment_altered = False
if ns.failfast:
support.failfast = True
if output_on_failure: