Add simple factor/primes regression tests

This will help ensure that the change following this
one to support OpenSSL 3 is sane.

MFC after:	1 week
Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D40297

etc/mtree/BSD.tests.dist

@@ -1036,6 +1036,8 @@
         ..
         du
         ..
+        factor
+        ..
         file2c
         ..
         file

usr.bin/factor/Makefile

@@ -17,4 +17,7 @@ MAN=	factor.6
 MLINKS+=factor.6 primes.6
 .PATH:	${SRCTOP}/usr.bin/primes
 
+HAS_TESTS=
+SUBDIR.${MK_TESTS}+=	tests
+
 .include <bsd.prog.mk>

usr.bin/factor/tests/Makefile

@@ -0,0 +1,4 @@
+ATF_TESTS_SH+=	factor_tests
+ATF_TESTS_SH+=	primes_tests
+
+.include <bsd.test.mk>

usr.bin/factor/tests/factor_tests.sh

@@ -0,0 +1,85 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright 2023 (C) Enji Cooper
+#
+# 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.
+
+atf_test_case float_non_prime
+float_non_prime_head()
+{
+	atf_set "descr" "Test with a float non-prime number"
+}
+float_non_prime_body()
+{
+	atf_check -o inline:"1: 1\n" factor 1.44
+}
+
+atf_test_case float_prime
+float_prime_head()
+{
+	atf_set "descr" "Test with a float prime number"
+}
+float_prime_body()
+{
+	pi="3.141592653589793238462643383279502884197"
+	atf_check -o inline:"3: 3\n" factor $pi
+}
+
+atf_test_case int_non_prime
+int_non_prime_head()
+{
+	atf_set "descr" "Test with an integral prime number"
+}
+int_non_prime_body()
+{
+	atf_check -o inline:"8: 2 2 2\n" factor 8
+}
+
+atf_test_case int_prime
+int_prime_head()
+{
+	atf_set "descr" "Test with an integral prime number"
+}
+int_prime_body()
+{
+	atf_check -o inline:"31: 31\n" factor 31
+}
+
+atf_test_case negative_numbers_not_allowed
+negative_numbers_not_allowed_head()
+{
+	atf_set "descr" "Verify that negative numbers are not allowed."
+}
+negative_numbers_not_allowed_body()
+{
+	atf_check -s not-exit:0 -e inline:"factor: negative numbers aren't permitted.\n" factor -- -4
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case float_non_prime
+	atf_add_test_case float_prime
+	atf_add_test_case int_non_prime
+	atf_add_test_case int_prime
+	atf_add_test_case negative_numbers_not_allowed
+}

usr.bin/factor/tests/primes_tests.sh

@@ -0,0 +1,75 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright 2023 (C) Enji Cooper
+#
+# 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.
+
+atf_test_case invalid_range
+invalid_range_head()
+{
+	atf_set "descr" "Verify that invalid ranges are not allowed."
+}
+invalid_range_body()
+{
+	atf_check -s not-exit:0 -e inline:"primes: start value must be less than stop value.\n" primes -- 2 1
+}
+
+atf_test_case negative_numbers_not_allowed
+negative_numbers_not_allowed_head()
+{
+	atf_set "descr" "Verify that negative numbers are not allowed."
+}
+negative_numbers_not_allowed_body()
+{
+	atf_check -s not-exit:0 -e inline:"primes: negative numbers aren't permitted.\n" primes -- -1 0
+}
+
+atf_test_case no_primes_between_between_20_and_22
+no_primes_between_between_20_and_22_head()
+{
+	atf_set "descr" "Show that no primes exist between [20, 22]."
+}
+
+no_primes_between_between_20_and_22_body()
+{
+	atf_check primes 20 22
+}
+
+atf_test_case primes_in_20_to_50_range
+primes_in_20_to_50_range_head()
+{
+	atf_set "descr" "Find all primes between [20, 50]."
+}
+
+primes_in_20_to_50_range_body()
+{
+	atf_check -o inline:"23\n29\n31\n37\n41\n43\n47\n" primes 20 50
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case invalid_range
+	atf_add_test_case negative_numbers_not_allowed
+	atf_add_test_case no_primes_between_between_20_and_22
+	atf_add_test_case primes_in_20_to_50_range
+}