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-rw-r--r--Lib/test/support/os_helper.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/test/support/os_helper.py b/Lib/test/support/os_helper.py
index d9807a1..ce01417 100644
--- a/Lib/test/support/os_helper.py
+++ b/Lib/test/support/os_helper.py
@@ -599,6 +599,10 @@ class EnvironmentVarGuard(collections.abc.MutableMapping):
def unset(self, envvar):
del self[envvar]
+ def copy(self):
+ # We do what os.environ.copy() does.
+ return dict(self)
+
def __enter__(self):
return self