--- a/tests/test-obsolete.t	Sun Jan 14 23:59:17 2018 -0800
+++ b/tests/test-obsolete.t	Sun Jan 14 00:02:40 2018 -0800
@@ -340,6 +340,17 @@
 
   $ cd ..
 
+Can disable transaction summary report
+
+  $ hg init transaction-summary
+  $ cd transaction-summary
+  $ mkcommit a
+  $ mkcommit b
+  $ hg up -q null
+  $ hg --config experimental.evolution.report-instabilities=false debugobsolete `getid a`
+  obsoleted 1 changesets
+  $ cd ..
+
 Exchange Test
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