Add some basic -s flag testcases for cut(1)

The remaining functionality seems to be covered in one form or
another via the NetBSD ATF testcase.

MFC after:	3 weeks
Sponsored by:	Dell EMC Isilon

usr.bin/cut/tests/Makefile

@@ -2,6 +2,7 @@
 
 PACKAGE=	tests
 
+ATF_TESTS_SH+=	cut2_test
 NETBSD_ATF_TESTS_SH=	cut_test
 
 ${PACKAGE}FILES=		d_basic.out

usr.bin/cut/tests/cut2_test.sh

@@ -0,0 +1,51 @@
+#
+# Copyright (c) 2017 Dell EMC
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+
+atf_test_case s_flag
+s_flag_head()
+{
+	atf_set "descr" "Check -s flag"
+}
+
+s_flag_body()
+{
+	cat >input<<EOF
+a,b,c,d
+b,c,d
+c,d
+d
+EOF
+	atf_check -o inline:'a\nb\nc\n' cut -d, -f 1 -s < input
+	atf_check -o inline:'d\n\n\n' cut -d, -f 4 -s < input
+	atf_check -o inline:'a,b,\nb,\n\n' cut -d 'c' -f 1 -s < input
+	atf_check -o empty cut -d'!' -f 1 -s < input
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case s_flag
+}