From fa3af3ce5010740f28faed22e0a1e819491f26b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@FreeBSD.org>
Date: Thu, 16 Mar 2023 15:36:49 +0000
Subject: [PATCH] tail: Verify correct behavior when input does not end in a
 newline.

Sponsored by:	Klara, Inc.
Reviewed by:	kevans
Differential Revision:	https://reviews.freebsd.org/D39116
---
 usr.bin/tail/tests/tail_test.sh | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/usr.bin/tail/tests/tail_test.sh b/usr.bin/tail/tests/tail_test.sh
index e8263864f28..36d6cdb6869 100755
--- a/usr.bin/tail/tests/tail_test.sh
+++ b/usr.bin/tail/tests/tail_test.sh
@@ -392,6 +392,19 @@ si_number_body() {
 	atf_check cmp outfile expectfile
 }
 
+atf_test_case no_lf_at_eof
+no_lf_at_eof_head()
+{
+	atf_set "descr" "File does not end in newline"
+}
+no_lf_at_eof_body()
+{
+	printf "a\nb\nc" >infile
+	atf_check -o inline:"c" tail -1 infile
+	atf_check -o inline:"b\nc" tail -2 infile
+	atf_check -o inline:"a\nb\nc" tail -3 infile
+	atf_check -o inline:"a\nb\nc" tail -4 infile
+}
 
 atf_init_test_cases()
 {
@@ -416,4 +429,5 @@ atf_init_test_cases()
 	atf_add_test_case silent_header
 	atf_add_test_case verbose_header
 	atf_add_test_case si_number
+	atf_add_test_case no_lf_at_eof
 }