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diff --git a/contrib/atf/atf-c++/detail/env_test.cpp b/contrib/atf/atf-c++/detail/env_test.cpp
new file mode 100644
index 000000000000..a7b681d14e11
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+++ b/contrib/atf/atf-c++/detail/env_test.cpp
@@ -0,0 +1,91 @@
+//
+// Automated Testing Framework (atf)
+//
+// Copyright (c) 2007 The NetBSD Foundation, Inc.
+// 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+//
+
+#include "../macros.hpp"
+
+#include "env.hpp"
+
+// ------------------------------------------------------------------------
+// Test cases for the free functions.
+// ------------------------------------------------------------------------
+
+ATF_TEST_CASE(has_get);
+ATF_TEST_CASE_HEAD(has_get)
+{
+    set_md_var("descr", "Tests the has and get functions");
+}
+ATF_TEST_CASE_BODY(has_get)
+{
+    ATF_REQUIRE(atf::env::has("PATH"));
+    ATF_REQUIRE(!atf::env::get("PATH").empty());
+
+    ATF_REQUIRE(!atf::env::has("_UNDEFINED_VARIABLE_"));
+}
+
+ATF_TEST_CASE(set);
+ATF_TEST_CASE_HEAD(set)
+{
+    set_md_var("descr", "Tests the set function");
+}
+ATF_TEST_CASE_BODY(set)
+{
+    ATF_REQUIRE(atf::env::has("PATH"));
+    const std::string& oldval = atf::env::get("PATH");
+    atf::env::set("PATH", "foo-bar");
+    ATF_REQUIRE(atf::env::get("PATH") != oldval);
+    ATF_REQUIRE_EQ(atf::env::get("PATH"), "foo-bar");
+
+    ATF_REQUIRE(!atf::env::has("_UNDEFINED_VARIABLE_"));
+    atf::env::set("_UNDEFINED_VARIABLE_", "foo2-bar2");
+    ATF_REQUIRE_EQ(atf::env::get("_UNDEFINED_VARIABLE_"), "foo2-bar2");
+}
+
+ATF_TEST_CASE(unset);
+ATF_TEST_CASE_HEAD(unset)
+{
+    set_md_var("descr", "Tests the unset function");
+}
+ATF_TEST_CASE_BODY(unset)
+{
+    ATF_REQUIRE(atf::env::has("PATH"));
+    atf::env::unset("PATH");
+    ATF_REQUIRE(!atf::env::has("PATH"));
+}
+
+// ------------------------------------------------------------------------
+// Main.
+// ------------------------------------------------------------------------
+
+ATF_INIT_TEST_CASES(tcs)
+{
+    // Add the test cases for the free functions.
+    ATF_ADD_TEST_CASE(tcs, has_get);
+    ATF_ADD_TEST_CASE(tcs, set);
+    ATF_ADD_TEST_CASE(tcs, unset);
+}