+test_begin_subtest "--output=files --format=json --duplicate=2"
+notmuch search --format=json --output=files --duplicate=2 '*' | sed -e "s,$MAIL_DIR,MAIL_DIR," >OUTPUT
+cat <<EOF >EXPECTED
+["MAIL_DIR/cur/51:2,"]
+EOF
+test_expect_equal_file OUTPUT EXPECTED
+