New test, for the bug fixed below.

diff --git a/tests/rm/isatty b/tests/rm/isatty
new file mode 100755 (executable)
index 0000000..e3a0317
--- /dev/null
+++ b/tests/rm/isatty
@@ -0,0 +1,58 @@
+#!/bin/sh
+# Make sure `chown 0 f; rm f' prompts before removing f.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  rm --version
+fi
+
+. $srcdir/../lang-default
+
+pwd=`pwd`
+tmp=isatty.$$
+trap 'status=$?; cd $pwd; rm -rf $tmp && exit $status' 0
+trap '(exit $?); exit' 1 2 13 15
+
+framework_failure=0
+mkdir $tmp || framework_failure=1
+cd $tmp || framework_failure=1
+
+if test $framework_failure = 1; then
+  echo 'failure in testing framework' 1>&2
+  (exit 1); exit
+fi
+
+fail=0
+
+# Skip this test if there is no /dev/stdin file.
+ls /dev/stdin >/dev/null 2>&1 \
+  || { (exit 77); exit; }
+
+touch f
+chmod 0 f
+rm f < /dev/stdin > out 2>&1 &
+pid=$!
+
+# Wait a second, to give a buggy rm (as in fileutils-4.0.40)
+# enough time to remove the file.
+sleep 1
+
+# The file must still exist.
+test -f f || fail=1
+
+kill $pid
+
+# Note the trailing `x' -- so I don't have to have a trailing
+# blank in this file :-)
+cat > exp <<\EOF
+rm: remove write-protected file `f'? x
+EOF
+#`
+
+# Append an `x' and a newline.
+echo x >> out
+
+cmp out exp || fail=1
+test $fail = 1 && diff out exp 2> /dev/null
+
+(exit $fail); exit