--- a/tests/test-setdiscovery.t Thu Jul 16 19:48:49 2020 +0200
+++ b/tests/test-setdiscovery.t Wed Jul 15 09:51:11 2020 +0200
@@ -1112,3 +1112,40 @@
* @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> found 101 common and 1 unknown server heads, 1 roundtrips in *.????s (glob)
* @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> -R r1 outgoing r2 *-T{rev} * --config *extensions.blackbox=* exited 0 after *.?? seconds (glob)
$ cd ..
+
+Even if the set of revs to discover is restricted, unrelated revs may be
+returned as common heads.
+
+ $ mkdir ancestorsof
+ $ cd ancestorsof
+ $ hg init a
+ $ hg clone a b -q
+ $ cd b
+ $ hg debugbuilddag '.:root *root *root'
+ $ hg log -G -T '{node|short}'
+ o fa942426a6fd
+ |
+ | o 66f7d451a68b
+ |/
+ o 1ea73414a91b
+
+ $ hg push -r 66f7d451a68b -q
+ $ hg debugdiscovery --verbose --rev fa942426a6fd
+ comparing with $TESTTMP/ancestorsof/a
+ searching for changes
+ elapsed time: * seconds (glob)
+ heads summary:
+ total common heads: 1
+ also local heads: 1
+ also remote heads: 1
+ both: 1
+ local heads: 2
+ common: 1
+ missing: 1
+ remote heads: 1
+ common: 1
+ unknown: 0
+ local changesets: 3
+ common: 2
+ missing: 1
+ common heads: 66f7d451a68b