revlog: add test for 7659eecd9da2 (issue1678)

tests/test-revlog-group-emptyiter

@@ -0,0 +1,23 b''
+#! /bin/sh
+
+# issue 1678
+
+echo "# -- setting up base repo"
+hg init a
+cd a
+touch a
+hg ci -Am a
+cd ..
+
+echo "# -- cloning base repo"
+hg clone a b
+cd b
+
+echo "# -- setting up cset to push"
+hg up null
+touch a
+hg ci -Am b # different msg so we get a clog new entry
+
+echo "# -- pushing"
+hg push -f ../a
+

tests/test-revlog-group-emptyiter.out

@@ -0,0 +1,16 b''
+# -- setting up base repo
+adding a
+# -- cloning base repo
+updating working directory
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+# -- setting up cset to push
+0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+adding a
+created new head
+# -- pushing
+pushing to ../a
+searching for changes
+adding changesets
+adding manifests
+adding file changes
+added 1 changesets with 0 changes to 0 files (+1 heads)