test: don't complain if an environment variable we don't want doesn't exist

nedbat · nedbat · commit c19658365310 · 2021-04-11T09:13:36.000-04:00
diff --git a/tests/mixins.py b/tests/mixins.py
@@ -47,7 +47,7 @@ def set_environ(self, name, value):
 
     def del_environ(self, name):
         """Delete an environment variable, unless we set it."""
-        self._monkeypatch.delenv(name)
+        self._monkeypatch.delenv(name, raising=False)
 
 
 class TempDirMixin(object):
