diff --git a/tests/test-setdiscovery.t b/tests/test-setdiscovery.t
--- a/tests/test-setdiscovery.t
+++ b/tests/test-setdiscovery.t
@@ -402,9 +402,20 @@
   comparing with r2
   searching for changes
   101 102 103 104 105 106 107 108 109 110  (no-eol)
+#if no-chg
   $ hg -R r1 --config extensions.blackbox= blackbox
   * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> outgoing r2 *-T{rev} * (glob)
   * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> found 101 common and 1 unknown server heads, 2 roundtrips in *.????s (glob)
   * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> -R r1 outgoing r2 *-T{rev} * --config *extensions.blackbox=* exited 0 after *.?? seconds (glob)
   * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> blackbox (glob)
+#else
+The first line of blackbox output will correspond to the chg master server.
+Therefore, glob first line when chg is running.
+  $ hg -R r1 --config extensions.blackbox= blackbox
+  * (glob)
+  * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> outgoing r2 *-T{rev} * (glob)
+  * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> found 101 common and 1 unknown server heads, 2 roundtrips in *.????s (glob)
+  * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> -R r1 outgoing r2 *-T{rev} * --config *extensions.blackbox=* exited 0 after *.?? seconds (glob)
+  * @5d0b986a083e0d91f116de4691e2aaa54d5bbec0 (*)> blackbox (glob)
+#endif
   $ cd ..