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;;; test-pearl-surface.el --- Tests for surfacing the active buffer -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Craig Jennings
;; Author: Craig Jennings <c@cjennings.net>
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Tests for `pearl--surface-buffer': bring the active org buffer to a window
;; after a command updates it, gated on `pearl-surface-buffer', focus-following
;; gated on `pearl-surface-select-window', and skipped when the buffer is dead
;; or already visible.
;;; Code:
(require 'test-bootstrap (expand-file-name "test-bootstrap.el"))
(require 'cl-lib)
(ert-deftest test-pearl-surface-buffer-disabled-is-noop ()
"With `pearl-surface-buffer' nil, nothing is displayed."
(let ((pearl-surface-buffer nil) (shown nil))
(cl-letf (((symbol-function 'display-buffer) (lambda (&rest _) (setq shown t)))
((symbol-function 'pop-to-buffer) (lambda (&rest _) (setq shown t))))
(with-temp-buffer
(pearl--surface-buffer (current-buffer))
(should-not shown)))))
(ert-deftest test-pearl-surface-buffer-shows-when-buried ()
"A live, un-displayed buffer is shown via `display-buffer' by default."
(let ((pearl-surface-buffer t) (pearl-surface-select-window nil) (shown nil))
(cl-letf (((symbol-function 'get-buffer-window) (lambda (&rest _) nil))
((symbol-function 'display-buffer) (lambda (b &rest _) (setq shown b)))
((symbol-function 'pop-to-buffer) (lambda (&rest _) (setq shown 'pop))))
(with-temp-buffer
(pearl--surface-buffer (current-buffer))
(should (eq shown (current-buffer)))))))
(ert-deftest test-pearl-surface-buffer-skips-when-already-shown ()
"A buffer already visible in some window is left alone."
(let ((pearl-surface-buffer t) (shown nil))
(cl-letf (((symbol-function 'get-buffer-window) (lambda (&rest _) 'a-window))
((symbol-function 'display-buffer) (lambda (&rest _) (setq shown t)))
((symbol-function 'pop-to-buffer) (lambda (&rest _) (setq shown t))))
(with-temp-buffer
(pearl--surface-buffer (current-buffer))
(should-not shown)))))
(ert-deftest test-pearl-surface-buffer-select-window-uses-pop-to-buffer ()
"With `pearl-surface-select-window' non-nil, focus follows via `pop-to-buffer'."
(let ((pearl-surface-buffer t) (pearl-surface-select-window t) (how nil))
(cl-letf (((symbol-function 'get-buffer-window) (lambda (&rest _) nil))
((symbol-function 'display-buffer) (lambda (&rest _) (setq how 'display)))
((symbol-function 'pop-to-buffer) (lambda (&rest _) (setq how 'pop))))
(with-temp-buffer
(pearl--surface-buffer (current-buffer))
(should (eq how 'pop))))))
(ert-deftest test-pearl-surface-buffer-dead-buffer-is-noop ()
"A killed buffer is never surfaced."
(let ((pearl-surface-buffer t) (shown nil) (buf (generate-new-buffer "x")))
(kill-buffer buf)
(cl-letf (((symbol-function 'display-buffer) (lambda (&rest _) (setq shown t)))
((symbol-function 'pop-to-buffer) (lambda (&rest _) (setq shown t))))
(pearl--surface-buffer buf)
(should-not shown))))
(provide 'test-pearl-surface)
;;; test-pearl-surface.el ends here
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