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diff --git a/etc/mtree/BSD.tests.dist b/etc/mtree/BSD.tests.dist
--- a/etc/mtree/BSD.tests.dist
+++ b/etc/mtree/BSD.tests.dist
@@ -1097,6 +1097,8 @@
..
du
..
+ env
+ ..
factor
..
file
diff --git a/usr.bin/env/Makefile b/usr.bin/env/Makefile
--- a/usr.bin/env/Makefile
+++ b/usr.bin/env/Makefile
@@ -1,7 +1,12 @@
+.include <src.opts.mk>
+
PACKAGE= runtime
PROG= env
SRCS= env.c envopts.c
LIBADD= util
+HAS_TESTS=
+SUBDIR.${MK_TESTS}= tests
+
.include <bsd.prog.mk>
diff --git a/usr.bin/env/tests/Makefile b/usr.bin/env/tests/Makefile
new file mode 100644
--- /dev/null
+++ b/usr.bin/env/tests/Makefile
@@ -0,0 +1,6 @@
+PACKAGE= tests
+
+ATF_TESTS_SH= env_test
+BINDIR= ${TESTSDIR}
+
+.include <bsd.test.mk>
diff --git a/usr.bin/env/tests/env_test.sh b/usr.bin/env/tests/env_test.sh
new file mode 100644
--- /dev/null
+++ b/usr.bin/env/tests/env_test.sh
@@ -0,0 +1,100 @@
+#
+# Copyright (c) 2024 Klara, Inc.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+
+magic_words="Squeamish $$ Ossifrage"
+
+atf_test_case basic
+basic_head()
+{
+ atf_set "descr" "Basic test case"
+}
+basic_body()
+{
+ atf_check -o match:"^magic_words=${magic_words}\$" \
+ env magic_words="${magic_words}"
+ export MAGIC_WORDS="${magic_words}"
+ atf_check -o match:"^MAGIC_WORDS=${magic_words}\$" \
+ env
+ unset MAGIC_WORDS
+}
+
+atf_test_case unset
+unset_head()
+{
+ atf_set "descr" "Unset a variable"
+}
+unset_body()
+{
+ export MAGIC_WORDS="${magic_words}"
+ atf_check -o not-match:"^MAGIC_WORDS=" \
+ env -u MAGIC_WORDS
+ unset MAGIC_WORDS
+}
+
+atf_test_case empty
+empty_head()
+{
+ atf_set "descr" "Empty environment"
+}
+empty_body()
+{
+ atf_check env -i
+}
+
+atf_test_case true
+true_head()
+{
+ atf_set "descr" "Run true"
+}
+true_body()
+{
+ atf_check env true
+}
+
+atf_test_case false
+false_head()
+{
+ atf_set "descr" "Run false"
+}
+false_body()
+{
+ atf_check -s exit:1 env false
+}
+
+atf_test_case false
+false_head()
+{
+ atf_set "descr" "Run false"
+}
+false_body()
+{
+ atf_check -s exit:1 env false
+}
+
+atf_test_case altpath
+altpath_head()
+{
+ atf_set "descr" "Use alternate path"
+}
+altpath_body()
+{
+ echo "echo ${magic_words}" >magic_words
+ chmod 0755 magic_words
+ atf_check -s exit:127 -e match:"No such file" \
+ env magic_words
+ atf_check -o inline:"${magic_words}\n" \
+ env -P "${PWD}" magic_words
+}
+
+atf_init_test_cases()
+{
+ atf_add_test_case basic
+ atf_add_test_case unset
+ atf_add_test_case empty
+ atf_add_test_case true
+ atf_add_test_case false
+ atf_add_test_case altpath
+}

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