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+;;; flow-fill-tests.el --- Tests for flow-fill.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2019-2022 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:
+
+;;; Code:
+
+(require 'ert)
+(require 'flow-fill)
+
+(ert-deftest fill-flow-tests-fill-flowed-decode ()
+  (let ((input
+         (concat
+          "> Thou villainous ill-breeding spongy dizzy-eyed \n"
+          "> reeky elf-skinned pigeon-egg! \n"
+          ">> Thou artless swag-bellied milk-livered \n"
+          ">> dismal-dreaming idle-headed scut!\n"
+          ">>> Thou errant folly-fallen spleeny reeling-ripe \n"
+          ">>> unmuzzled ratsbane!\n"
+          ">>>> Henceforth, the coding style is to be strictly \n"
+          ">>>> enforced, including the use of only upper case.\n"
+          ">>>>> I've noticed a lack of adherence to \n"
+          ">>>>> the coding \n"
+          ">>>>> styles, of late.\n"
+          ">>>>>> Any complaints?\n"))
+        (output
+         (concat
+          "> Thou villainous ill-breeding spongy dizzy-eyed reeky elf-skinned\n"
+          "> pigeon-egg! \n"
+          ">> Thou artless swag-bellied milk-livered dismal-dreaming idle-headed\n"
+          ">> scut!\n"
+          ">>> Thou errant folly-fallen spleeny reeling-ripe unmuzzled ratsbane!\n"
+          ">>>> Henceforth, the coding style is to be strictly enforced,\n"
+          ">>>> including the use of only upper case.\n"
+          ">>>>> I've noticed a lack of adherence to the coding styles, of late.\n"
+          ">>>>>> Any complaints?\n"))
+        (fill-flowed-display-column 69))
+    (with-temp-buffer
+      (insert input)
+      (fill-flowed)
+      (message "foo")
+      (should (equal (buffer-string) output)))))
+
+(ert-deftest fill-flow-tests-fill-flowed-encode ()
+  (let ((input
+         (concat
+          "> Thou villainous ill-breeding spongy dizzy-eyed \n"
+          "> reeky elf-skinned pigeon-egg! \n"
+          ">> Thou artless swag-bellied milk-livered \n"
+          ">> dismal-dreaming idle-headed scut!\n"
+          ">>> Thou errant folly-fallen spleeny reeling-ripe \n"
+          ">>> unmuzzled ratsbane!\n"
+          ">>>> Henceforth, the coding style is to be strictly \n"
+          ">>>> enforced, including the use of only upper case.\n"
+          ">>>>> I've noticed a lack of adherence to the coding \n"
+          ">>>>> styles, of late.\n"
+          ">>>>>> Any complaints?\n"))
+        (output
+         (concat
+          "> Thou villainous ill-breeding spongy dizzy-eyed \n"
+          "> reeky elf-skinned pigeon-egg! \n"
+          ">> Thou artless swag-bellied milk-livered \n"
+          ">> dismal-dreaming idle-headed scut!\n"
+          ">>> Thou errant folly-fallen spleeny reeling-ripe \n"
+          ">>> unmuzzled ratsbane!\n"
+          ">>>> Henceforth, the coding style is to be strictly \n"
+          ">>>> enforced, including the use of only upper case.\n"
+          ">>>>> I've noticed a lack of adherence to the coding \n"
+          ">>>>> styles, of late.\n"
+          ">>>>>> Any complaints?\n"))
+        (fill-flowed-display-column 69))
+    (with-temp-buffer
+      (insert input)
+      (fill-flowed-encode)
+      (should (equal (buffer-string) output)))))
+
+(ert-deftest fill-flow-tests-fill-flowed-stuffed ()
+  (let ((input
+         (concat
+          " > From space-stuffed with a \n"
+          "continuation.\n"))
+        (output
+         "> From space-stuffed with a continuation.\n")
+        (fill-flowed-display-column 69))
+    (with-temp-buffer
+      (insert input)
+      (fill-flowed)
+      (should (equal (buffer-string) output)))))
+
+(provide 'flow-fill-tests)
+;;; flow-fill-tests.el ends here