pwd: Add tests

MFC after:	1 week
Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D55153

bin/pwd/Makefile

@@ -1,4 +1,8 @@
-PACKAGE=runtime
-PROG=	pwd
+.include <src.opts.mk>
+
+PACKAGE=		runtime
+PROG=			pwd
+HAS_TESTS=
+SUBDIR.${MK_TESTS}=	tests
 
 .include <bsd.prog.mk>

bin/pwd/tests/Makefile

@@ -0,0 +1,4 @@
+PACKAGE=	tests
+ATF_TESTS_SH=	pwd_test
+
+.include <bsd.test.mk>

bin/pwd/tests/pwd_test.sh

@@ -0,0 +1,73 @@
+#
+# Copyright (c) 2026 Dag-Erling Smørgrav
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+
+atf_test_case logical
+logical_head()
+{
+	atf_set "descr" "Cases where pwd prints the " \
+		"logical working directory"
+}
+logical_body()
+{
+	root=$(realpath $PWD)
+	atf_check mkdir -p phy/baz
+	atf_check ln -s phy log
+	cd log/baz
+
+	# explicitly request logical
+	export PWD="$root/log/baz"
+	atf_check -o inline:"$root/log/baz\n" pwd -L
+	atf_check -o inline:"$root/log/baz\n" pwd -P -L
+
+	# logical is also the default
+	export PWD="$root/log/baz"
+	atf_check -o inline:"$root/log/baz\n" pwd
+}
+
+atf_test_case physical
+physical_head()
+{
+	atf_set "descr" "Cases where pwd prints the " \
+		"physical working directory"
+}
+physical_body()
+{
+	root=$(realpath $PWD)
+	atf_check mkdir -p phy/baz
+	atf_check ln -s phy log
+	cd log/baz
+
+	# explicitly request physical
+	export PWD="$root/log/baz"
+	atf_check -o inline:"$root/phy/baz\n" pwd -P
+	atf_check -o inline:"$root/phy/baz\n" pwd -L -P
+
+	# request logical but $PWD is relative
+	export PWD="log/baz"
+	atf_check -o inline:"$root/phy/baz\n" pwd -L
+
+	# request logical but $PWD contains dot
+	export PWD="$root/log/./baz"
+	atf_check -o inline:"$root/phy/baz\n" pwd -L
+
+	# request logical but $PWD contains dot-dot
+	export PWD="$root/log/../log/baz"
+	atf_check -o inline:"$root/phy/baz\n" pwd -L
+
+	# request logical but $PWD does not exist
+	export PWD="$root/baz"
+	atf_check -o inline:"$root/phy/baz\n" pwd -L
+
+	# request logical but $PWD does not match
+	export PWD="$root/log"
+	atf_check -o inline:"$root/phy/baz\n" pwd -L
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case logical
+	atf_add_test_case physical
+}

etc/mtree/BSD.tests.dist

@@ -49,6 +49,8 @@
         ..
         pwait
         ..
+        pwd
+        ..
         rm
         ..
         rmdir