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diff --git a/test/lisp/password-cache-tests.el b/test/lisp/password-cache-tests.el
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+++ b/test/lisp/password-cache-tests.el
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+;;; password-cache-tests.el --- Tests for password-cache.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2019 Free Software Foundation, Inc.
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; 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:
+
+;;; Code:
+
+(require 'ert)
+(require 'password-cache)
+
+(ert-deftest password-cache-tests-add-and-remove ()
+  (let ((password-data (copy-hash-table password-data)))
+    (password-cache-add "foo" "bar")
+    (should (equal (password-in-cache-p "foo") "bar"))
+    (password-cache-remove "foo")
+    (should (not (password-in-cache-p "foo")))))
+
+(ert-deftest password-cache-tests-read-from-cache ()
+  (let ((password-data (copy-hash-table password-data)))
+    (password-cache-add "foo" "bar")
+    (should (equal (password-read-from-cache "foo") "bar"))
+    (should (not (password-read-from-cache nil)))))
+
+(ert-deftest password-cache-tests-in-cache-p ()
+  (let ((password-data (copy-hash-table password-data)))
+    (password-cache-add "foo" "bar")
+    (should (password-in-cache-p "foo"))
+    (should (not (password-read-from-cache nil)))))
+
+(ert-deftest password-cache-tests-read ()
+  (let ((password-data (copy-hash-table password-data)))
+    (password-cache-add "foo" "bar")
+    (should (equal (password-read nil "foo") "bar"))))
+
+(ert-deftest password-cache-tests-reset ()
+  (let ((password-data (copy-hash-table password-data)))
+    (password-cache-add "foo" "bar")
+    (password-reset)
+    (should (not (password-in-cache-p "foo")))))
+
+(ert-deftest password-cache-tests-add/expires-key ()
+  :tags '(:expensive-test)
+  (let ((password-data (copy-hash-table password-data))
+        (password-cache-expiry 0.01))
+    (password-cache-add "foo" "bar")
+    (sit-for 0.1)
+    (should (not (password-in-cache-p "foo")))))
+
+(ert-deftest password-cache-tests-no-password-cache ()
+  (let ((password-data (copy-hash-table password-data))
+        (password-cache nil))
+    (password-cache-add "foo" "bar")
+    (should (not (password-in-cache-p "foo")))
+    (should (not (password-read-from-cache "foo")))))
+
+(provide 'password-cache-tests)
+;;; password-cache-tests.el ends here