diff -r 0a507da7d8ea -r 15a79ac823e8 tests/test-merge-default.t
--- a/tests/test-merge-default.t	Sat Jun 24 15:11:05 2017 -0700
+++ b/tests/test-merge-default.t	Sat Jun 24 23:09:21 2017 -0400
@@ -49,6 +49,19 @@
   $ hg merge 2
   0 files updated, 1 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
+  $ hg id -Tjson
+  [
+   {
+    "bookmarks": [],
+    "branch": "default",
+    "changed": "+",
+    "id": "f25cbe84d8b3+2d95304fed5d+",
+    "node": "ffffffffffffffffffffffffffffffffffffffff",
+    "p1": [{"node": "f25cbe84d8b320e298e7703f18a25a3959518c23", "rev": 4}],
+    "p2": [{"node": "2d95304fed5d89bc9d70b2a0d02f0d567469c3ab", "rev": 2}],
+    "tags": ["tip"]
+   }
+  ]
   $ hg commit -mm1
 
 Should succeed - 2 heads:
@@ -65,6 +78,17 @@
   (branch merge, don't forget to commit)
   $ hg commit -mm2
 
+  $ hg id -r 1 -Tjson
+  [
+   {
+    "bookmarks": [],
+    "branch": "default",
+    "id": "1846eede8b68",
+    "node": "1846eede8b6886d8cc8a88c96a687b7fe8f3b9d1",
+    "tags": []
+   }
+  ]
+
 Should fail because at tip:
 
   $ hg merge