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diff --git a/test/lisp/eshell/esh-opt-tests.el b/test/lisp/eshell/esh-opt-tests.el
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+;;; tests/esh-opt-tests.el --- esh-opt test suite
+
+;; Copyright (C) 2018 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 'ert)
+(require 'esh-opt)
+
+(ert-deftest esh-opt-process-args-test ()
+  "Unit tests which verify correct behavior of `eshell--process-args'."
+  (should
+   (equal '(t)
+          (eshell--process-args
+           "sudo"
+           '("-a")
+           '((?a "all" nil show-all "")))))
+  (should
+   (equal '(nil)
+          (eshell--process-args
+           "sudo"
+           '("-g")
+           '((?a "all" nil show-all "")))))
+  (should
+   (equal '("root" "world")
+          (eshell--process-args
+           "sudo"
+           '("-u" "root" "world")
+           '((?u "user" t user "execute a command as another USER")))))
+  (should
+   (equal '(nil "emerge" "-uDN" "world")
+          (eshell--process-args
+           "sudo"
+           '("emerge" "-uDN" "world")
+           '((?u "user" t user "execute a command as another USER")
+             :parse-leading-options-only))))
+  (should
+   (equal '("root" "emerge" "-uDN" "world")
+          (eshell--process-args
+           "sudo"
+           '("-u" "root" "emerge" "-uDN" "world")
+           '((?u "user" t user "execute a command as another USER")
+             :parse-leading-options-only))))
+  (should
+   (equal '("world" "emerge")
+          (eshell--process-args
+           "sudo"
+           '("-u" "root" "emerge" "-uDN" "world")
+           '((?u "user" t user "execute a command as another USER"))))))
+
+(ert-deftest test-eshell-eval-using-options ()
+  "Tests for `eshell-eval-using-options'."
+  (eshell-eval-using-options
+   "sudo" '("-u" "root" "whoami")
+   '((?u "user" t user "execute a command as another USER")
+     :parse-leading-options-only)
+   (should (equal user "root")))
+  (eshell-eval-using-options
+   "sudo" '("--user" "root" "whoami")
+   '((?u "user" t user "execute a command as another USER")
+     :parse-leading-options-only)
+   (should (equal user "root")))
+
+  (eshell-eval-using-options
+   "sudo" '("emerge" "-uDN" "world")
+   '((?u "user" t user "execute a command as another USER"))
+   (should (equal user "world")))
+  (eshell-eval-using-options
+   "sudo" '("emerge" "-uDN" "world")
+   '((?u "user" t user "execute a command as another USER")
+     :parse-leading-options-only)
+   (should (eq user nil)))
+
+  (eshell-eval-using-options
+   "ls" '("-I" "*.txt" "/dev/null")
+   '((?I "ignore" t ignore-pattern
+	 "do not list implied entries matching pattern"))
+   (should (equal ignore-pattern "*.txt")))
+
+  (eshell-eval-using-options
+   "ls" '("-l" "/dev/null")
+   '((?l nil long-listing listing-style
+	 "use a long listing format"))
+   (should (eql listing-style 'long-listing)))
+  (eshell-eval-using-options
+   "ls" '("/dev/null")
+   '((?l nil long-listing listing-style
+	 "use a long listing format"))
+   (should (eq listing-style nil)))
+
+  (eshell-eval-using-options
+   "ls" '("/dev/null" "-h")
+   '((?h "human-readable" 1024 human-readable
+	 "print sizes in human readable format"))
+   (should (eql human-readable 1024)))
+  (eshell-eval-using-options
+   "ls" '("/dev/null" "--human-readable")
+   '((?h "human-readable" 1024 human-readable
+	 "print sizes in human readable format"))
+   (should (eql human-readable 1024)))
+  (eshell-eval-using-options
+   "ls" '("/dev/null")
+   '((?h "human-readable" 1024 human-readable
+	 "print sizes in human readable format"))
+   (should (eq human-readable nil))))
+
+(provide 'esh-opt-tests)
+
+;;; esh-opt-tests.el ends here