result=$(($subtotal == $total-1))
test_expect_equal 1 "$result"
+if [ $NOTMUCH_HAVE_SFSEXP -eq 1 ]; then
+ test_begin_subtest 'exclude one message using negative lastmod (sexp)'
+ total=$(notmuch count '*')
+ notmuch tag +${RANDOM} id:4EFC743A.3060609@april.org
+ count=$(notmuch count --query=sexp '(lastmod -1 *)')
+ test_expect_equal 1 "$count"
+fi
+
test_done