From afa3bdf2c7c22dd2e532d9b8971c96d90122548e Mon Sep 17 00:00:00 2001
From: Mitch Burton <mitch.burton@canonical.com>
Date: Tue, 26 Nov 2024 17:44:15 -0800
Subject: [PATCH] fix: get tests passing on plucky

---
 landscape/lib/testing.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/landscape/lib/testing.py b/landscape/lib/testing.py
index 1c13b962d..b9c6e06c9 100644
--- a/landscape/lib/testing.py
+++ b/landscape/lib/testing.py
@@ -685,7 +685,12 @@ def fake():
             # because the call might cancel it!
             call._data = self.call_later(seconds, fake)._data
             try:
-                f(*args, **kwargs)
+                deferred = f(*args, **kwargs)
+
+                if hasattr(deferred, "result") and isinstance(deferred.result, Failure):
+                    # Required for some failures to get GC'd properly flushed.
+                    # Twisted did this in versions < 24.10, but now we have to.
+                    deferred.result.cleanFailure()
             except Exception:
                 if call.active:
                     self.cancel_call(call)