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+;;; em-basic-tests.el --- em-basic test suite  -*- 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/>.
+
+;;; Commentary:
+
+;; Tests for basic Eshell commands.
+
+;;; Code:
+
+(require 'ert)
+(require 'em-basic)
+
+(require 'eshell-tests-helpers
+         (expand-file-name "eshell-tests-helpers"
+                           (file-name-directory (or load-file-name
+                                                    default-directory))))
+
+;;; Tests:
+
+(ert-deftest em-basic-test/umask-print-numeric ()
+  "Test printing umask numerically."
+  (cl-letf (((symbol-function 'default-file-modes) (lambda () #o775)))
+    (eshell-command-result-equal "umask" "002\n"))
+  (cl-letf (((symbol-function 'default-file-modes) (lambda () #o654)))
+    (eshell-command-result-equal "umask" "123\n"))
+  ;; Make sure larger numbers don't cause problems.
+  (cl-letf (((symbol-function 'default-file-modes) (lambda () #o1775)))
+    (eshell-command-result-equal "umask" "002\n")))
+
+(ert-deftest em-basic-test/umask-read-symbolic ()
+  "Test printing umask symbolically."
+  (cl-letf (((symbol-function 'default-file-modes) (lambda () #o775)))
+    (eshell-command-result-equal "umask -S"
+                                 "u=rwx,g=rwx,o=rx\n"))
+  (cl-letf (((symbol-function 'default-file-modes) (lambda () #o654)))
+    (eshell-command-result-equal "umask -S"
+                                 "u=wx,g=rx,o=x\n"))
+  ;; Make sure larger numbers don't cause problems.
+  (cl-letf (((symbol-function 'default-file-modes) (lambda () #o1775)))
+    (eshell-command-result-equal "umask -S"
+                                 "u=rwx,g=rwx,o=rx\n")))
+
+(ert-deftest em-basic-test/umask-set ()
+  "Test setting umask."
+  (let ((file-modes 0))
+    (cl-letf (((symbol-function 'set-default-file-modes)
+               (lambda (mode) (setq file-modes mode))))
+      (eshell-test-command-result "umask 002")
+      (should (= file-modes #o775))
+      (eshell-test-command-result "umask 123")
+      (should (= file-modes #o654))
+      (eshell-test-command-result "umask $(identity #o222)")
+      (should (= file-modes #o555)))))
+
+;; em-basic-tests.el ends here