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;;; test-music-config--ensure-playlist-buffer.el --- Tests for playlist buffer creation -*- coding: utf-8; lexical-binding: t; -*-
;;
;; Author: Craig Jennings <c@cjennings.net>
;;
;;; Commentary:
;; Unit tests for cj/music--ensure-playlist-buffer function.
;; Tests buffer creation, mode setup, and global variable assignment.
;;
;; Test organization:
;; - Normal Cases: Creates new buffer, returns existing buffer
;; - Boundary Cases: Wrong mode gets corrected, sets global variable
;; - Error Cases: Killed buffer gets recreated, returns live buffer
;;
;;; Code:
(require 'ert)
;; Stub missing dependencies before loading music-config
(defvar-keymap cj/custom-keymap
:doc "Stub keymap for testing")
;; Add EMMS elpa directory to load path for batch testing
(let ((emms-dir (car (file-expand-wildcards
(expand-file-name "elpa/emms-*" user-emacs-directory)))))
(when emms-dir
(add-to-list 'load-path emms-dir)))
(require 'emms)
(require 'emms-playlist-mode)
(require 'music-config)
;;; Test helpers
(defun test-ensure--teardown ()
"Clean up test playlist buffer."
(when-let ((buf (get-buffer cj/music-playlist-buffer-name)))
(kill-buffer buf)))
;;; Normal Cases
(ert-deftest test-music-config--ensure-playlist-buffer-normal-creates-buffer-when-none-exists ()
"Creates a new playlist buffer when none exists."
(unwind-protect
(progn
;; Kill any existing buffer
(when-let ((buf (get-buffer cj/music-playlist-buffer-name)))
(kill-buffer buf))
(let ((result (cj/music--ensure-playlist-buffer)))
(should (bufferp result))
(should (buffer-live-p result))
(should (equal (buffer-name result) cj/music-playlist-buffer-name))))
(test-ensure--teardown)))
(ert-deftest test-music-config--ensure-playlist-buffer-normal-returns-existing-buffer ()
"Returns existing buffer without recreating it."
(unwind-protect
(let* ((buf1 (cj/music--ensure-playlist-buffer))
(buf2 (cj/music--ensure-playlist-buffer)))
(should (eq buf1 buf2)))
(test-ensure--teardown)))
;;; Boundary Cases
(ert-deftest test-music-config--ensure-playlist-buffer-boundary-wrong-mode-corrected ()
"Buffer in wrong mode gets corrected to emms-playlist-mode."
(unwind-protect
(progn
;; Create buffer in fundamental-mode
(let ((buf (get-buffer-create cj/music-playlist-buffer-name)))
(with-current-buffer buf
(fundamental-mode)))
(let ((result (cj/music--ensure-playlist-buffer)))
(with-current-buffer result
(should (eq major-mode 'emms-playlist-mode)))))
(test-ensure--teardown)))
(ert-deftest test-music-config--ensure-playlist-buffer-boundary-sets-global-variable ()
"Sets emms-playlist-buffer to the returned buffer."
(unwind-protect
(let ((result (cj/music--ensure-playlist-buffer)))
(should (eq emms-playlist-buffer result)))
(test-ensure--teardown)))
(ert-deftest test-music-config--ensure-playlist-buffer-boundary-sets-buffer-local-flag ()
"Sets emms-playlist-buffer-p to t in the buffer."
(unwind-protect
(let ((result (cj/music--ensure-playlist-buffer)))
(with-current-buffer result
(should (eq emms-playlist-buffer-p t))))
(test-ensure--teardown)))
;;; Error Cases
(ert-deftest test-music-config--ensure-playlist-buffer-error-killed-buffer-recreated ()
"After buffer is killed, calling again creates a new live buffer."
(unwind-protect
(progn
(let ((buf1 (cj/music--ensure-playlist-buffer)))
(kill-buffer buf1))
(let ((buf2 (cj/music--ensure-playlist-buffer)))
(should (buffer-live-p buf2))
(should (equal (buffer-name buf2) cj/music-playlist-buffer-name))))
(test-ensure--teardown)))
(provide 'test-music-config--ensure-playlist-buffer)
;;; test-music-config--ensure-playlist-buffer.el ends here
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