test/src/xdisp-tests.el: New file

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diff --git a/test/src/xdisp-tests.el b/test/src/xdisp-tests.el
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+;;; xdisp-tests.el --- tests for xdisp.c functions -*- lexical-binding: t -*-
+
+;; Copyright (C) 2020 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)
+
+(ert-deftest xdisp-tests--minibuffer-resizing () ;; bug#43519
+  ;; FIXME: This test returns success when run in batch but
+  ;; it's only a lucky accident: it also returned success
+  ;; when bug#43519 was not fixed.
+  (should
+   (equal
+    t
+    (catch 'result
+      (minibuffer-with-setup-hook
+          (lambda ()
+            (insert "hello")
+            (let ((ol (make-overlay (point) (point)))
+                  (max-mini-window-height 1)
+                  (text "askdjfhaklsjdfhlkasjdfhklasdhflkasdhflkajsdhflkashdfkljahsdlfkjahsdlfkjhasldkfhalskdjfhalskdfhlaksdhfklasdhflkasdhflkasdhflkajsdhklajsdgh"))
+             ;; (save-excursion (insert text))
+             ;; (sit-for 2)
+             ;; (delete-region (point) (point-max))
+             (put-text-property 0 1 'cursor t text)
+             (overlay-put ol 'after-string text)
+             (redisplay 'force)
+             (throw 'result
+                    ;; Make sure we do the see "hello" text.
+                    (prog1 (equal (window-start) (point-min))
+                      ;; (list (window-start) (window-end) (window-width))
+                      (delete-overlay ol)))))
+        (let ((executing-kbd-macro t)) ;Force real minibuffer in `read-string'.
+          (read-string "toto: ")))))))
+
+;;; xdisp-tests.el ends here