[gnome-settings-daemon/benzea/tests-output-checker-testing] tests: cleanup on __del__

[Benjamin Berg <bberg src gnome org>]

commit 7ca3fc4e1883542c87a94dfadeec0f8869553d3a
Author: Benjamin Berg <bberg redhat com>
Date:   Mon Feb 15 15:27:02 2021 +0100

    tests: cleanup on __del__

 tests/output_checker.py | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/tests/output_checker.py b/tests/output_checker.py
index 36be8225..b5f055d8 100644
--- a/tests/output_checker.py
+++ b/tests/output_checker.py
@@ -168,3 +168,10 @@ class OutputChecker(object):
     def writer_attached(self):
         pass
 
+    def __del__(self):
+        if self._pipe_fd_r > 0:
+            os.close(self._pipe_fd_r)
+        if self._pipe_fd_w > 0:
+            os.close(self._pipe_fd_w)
+
+        assert not self._thread.is_alive()