tests: tee: add a test for --append

* tests/tee/append.sh: New file.
* tests/local.mk (all_tests): Add the test.

diff --git a/tests/local.mk b/tests/local.mk
index f84dd4f4190ccbe3b5537427b1180bca36c0455c..53560de0f73fe0cd25e3674e7170dab72d09f0e3 100644 (file)
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -464,6 +464,7 @@ all_tests =                                 \
   tests/tac/tac-locale.sh                      \
   tests/tac/tac-2-nonseekable.sh               \
   tests/tail/tail.pl                           \
+  tests/tee/append.sh                          \
   tests/misc/tee.sh                            \
   tests/test/test-N.sh                         \
   tests/test/test-diag.pl                      \

diff --git a/tests/tee/append.sh b/tests/tee/append.sh
new file mode 100755 (executable)
index 0000000..df6ed18
--- /dev/null
+++ b/tests/tee/append.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+# test the behavior of 'tee --append'
+
+# Copyright (C) 2025 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/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ tee
+
+# Test the short and long option.
+for opt in -a --append; do
+  echo 'line 1' > inp || framework_failure_
+  cat inp > exp || framework_failure_
+  # POSIX says: "Processing of at least 13 file operands shall be supported."
+  files=$(seq 13)
+  # Setup and verify the files.
+  tee $files <inp >out || fail=1
+  for f in out $files; do
+    compare exp $f || fail=1
+  done
+  echo 'line 2' > inp || framework_failure_
+  cat inp >> exp || framework_failure_
+  # Only one -a or --append option is needed, but check that 'tee' behaves the
+  # same with duplicate options.
+  opts=$(for f in $files; do printf -- ' %s %s' $opt $f; done)
+  tee $opts < inp > out || framework_failure_
+  # Standard output should only have the line we appended.
+  compare inp out || fail=1
+  # The files should have line 1 and line 2.
+  for f in $files; do
+    compare exp $f || fail=1
+  done
+done
+
+Exit $fail