+test_begin_subtest "reference loop ordered by date"
+threadid=$(notmuch search --output=threads id:mid-loop-12@example.org)
+notmuch show --format=mbox $threadid | grep '^Date' > OUTPUT
+cat <<EOF > EXPECTED
+Date: Thu, 16 Jun 2016 22:14:41 -0400
+Date: Fri, 17 Jun 2016 22:14:41 -0400
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+