diff --git a/tests/bonsai/fop.sh b/tests/bonsai/fop.sh
new file mode 100755
index 0000000..2a4e4a9
--- /dev/null
+++ b/tests/bonsai/fop.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
+# SPDX-License-Identifier: FSFAP
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and this
+# notice are preserved.  This file is offered as-is, without any warranty.
+
+. tests/bonsai/aliases
+
+! fop -h
+
+"$BIN/strcmp" "$(printf 'test0␞test1␞test2\n' | fop 1 sed 's/1/4/g')" \
+	'test0␞test4␞test2'
+
+"$BIN/strcmp" "$(printf 'test0 test1 test2\n' | fop -d' ' 2 sed 's/2/4/g')" \
+	'test0 test1 test4'
+
+! printf 'test\n' | fop 1 cat
+! printf 'test\n' | fop 'test' cat
+! printf 'test\n' | fop -d'test' cat