diff --git a/tests/test-committer b/tests/test-committer
--- a/tests/test-committer
+++ b/tests/test-committer
@@ -10,3 +10,17 @@ touch asdf
 hg add asdf
 hg commit -d '1000000 0' -m commit-1
 hg tip
+
+unset EMAIL
+echo 1 > asdf
+hg commit -d '1000000 0' -m commit-1
+hg commit -d '1000000 0' -u "foo@bar.com" -m commit-1
+hg tip
+echo "[ui]" >> .hg/hgrc
+echo "username = foobar <foo@bar.com>" >> .hg/hgrc
+echo 12 > asdf
+hg commit -d '1000000 0' -m commit-1
+hg tip
+echo 1 > asdf
+hg commit -d '1000000 0' -u "foo@bar.com" -m commit-1
+hg tip