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diff --git a/tests/misc/cat-self.sh b/tests/misc/cat-self.sh
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+#!/bin/sh
+# Check that cat operates correctly when the input is the same as the output.
+
+# Copyright 2014-2022 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ cat
+
+echo x >out || framework_failure_
+echo x >out1 || framework_failure_
+returns_ 1 cat out >>out || fail=1
+compare out out1 || fail=1
+
+# This example is taken from the POSIX spec for 'cat'.
+echo x >doc || framework_failure_
+echo y >doc.end || framework_failure_
+cat doc doc.end >doc || fail=1
+compare doc doc.end || fail=1
+
+Exit $fail