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-rw-r--r--cloudinit/tests/helpers.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/cloudinit/tests/helpers.py b/cloudinit/tests/helpers.py
index 70f6bad7..8adb9e75 100644
--- a/cloudinit/tests/helpers.py
+++ b/cloudinit/tests/helpers.py
@@ -363,6 +363,7 @@ class FilesystemMockingTestCase(ResourceUsingTestCase):
root = self.tmp_dir()
self.patchUtils(root)
self.patchOS(root)
+ self.patchOpen(root)
return root
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