* test/lisp/env-tests.el: New file.

lisp/env.el

@@ -1,6 +1,6 @@
 ;;; env.el --- functions to manipulate environment variables  -*- lexical-binding:t -*-
 
-;; Copyright (C) 1991, 1994, 2000-2022 Free Software Foundation, Inc.
+;; Copyright (C) 1991-2022 Free Software Foundation, Inc.
 
 ;; Maintainer: emacs-devel@gnu.org
 ;; Keywords: processes, unix

test/lisp/env-tests.el

@@ -0,0 +1,40 @@
+;;; env-tests.el --- Tests for env.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2022 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'env)
+(require 'ert)
+
+(ert-deftest test-substitute-env-in-file-name ()
+  (should (equal (substitute-env-in-file-name "foo_${HOME}_bar")
+                 (concat "foo_" (getenv "HOME") "_bar"))))
+
+(ert-deftest test-getenv-setenv ()
+  (should (equal (setenv "EMACS_ENV_EL_TEST_VAR" "foobar") "foobar"))
+  (should (equal (getenv "EMACS_ENV_EL_TEST_VAR") "foobar"))
+  (should-not (getenv "LIKELY_TO_BE_NON_EXISTENT_FOO_BAR_BAZ")))
+
+(ert-deftest test-with-environment-variables ()
+  (let ((A "TEST") (B "/foo/bar"))
+    (with-environment-variables ((A B))
+      (should (equal (getenv A) B)))))
+
+(provide 'env-tests)
+;;; env-tests.el ends here