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;;; test-music-config--playlist-tracks.el --- Tests for playlist track extraction -*- coding: utf-8; lexical-binding: t; -*-
;;
;; Author: Craig Jennings <c@cjennings.net>
;;
;;; Commentary:
;; Unit tests for cj/music--playlist-tracks function.
;; Tests reading track names from the current EMMS playlist buffer.
;;
;; Test organization:
;; - Normal Cases: Single and multiple tracks
;; - Boundary Cases: Empty playlist, order preservation
;; - Error Cases: No playlist buffer, tracks without names
;;
;;; 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-tracks--setup-playlist-buffer (track-names)
"Create an EMMS playlist buffer with TRACK-NAMES and return it.
Each entry in TRACK-NAMES becomes a file track in the playlist."
(let ((buf (get-buffer-create cj/music-playlist-buffer-name)))
(with-current-buffer buf
(emms-playlist-mode)
(setq emms-playlist-buffer-p t)
(let ((inhibit-read-only t))
(erase-buffer)
(dolist (name track-names)
(emms-playlist-insert-track (emms-track 'file name)))))
(setq emms-playlist-buffer buf)
buf))
(defun test-tracks--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--playlist-tracks-normal-multiple-tracks-returns-list ()
"Multiple tracks in playlist returns list of track names."
(unwind-protect
(let ((tracks '("/music/a.mp3" "/music/b.mp3" "/music/c.mp3")))
(test-tracks--setup-playlist-buffer tracks)
(should (equal (cj/music--playlist-tracks) tracks)))
(test-tracks--teardown)))
(ert-deftest test-music-config--playlist-tracks-normal-single-track-returns-list ()
"Single track in playlist returns single-element list."
(unwind-protect
(let ((tracks '("/music/only.mp3")))
(test-tracks--setup-playlist-buffer tracks)
(should (equal (cj/music--playlist-tracks) tracks)))
(test-tracks--teardown)))
;;; Boundary Cases
(ert-deftest test-music-config--playlist-tracks-boundary-empty-playlist-returns-nil ()
"Empty playlist returns nil (empty list)."
(unwind-protect
(progn
(test-tracks--setup-playlist-buffer '())
(should-not (cj/music--playlist-tracks)))
(test-tracks--teardown)))
(ert-deftest test-music-config--playlist-tracks-boundary-preserves-insertion-order ()
"Track order matches insertion order."
(unwind-protect
(let ((tracks '("/music/z.mp3" "/music/a.mp3" "/music/m.mp3")))
(test-tracks--setup-playlist-buffer tracks)
(should (equal (cj/music--playlist-tracks) tracks)))
(test-tracks--teardown)))
(ert-deftest test-music-config--playlist-tracks-boundary-url-tracks-included ()
"URL tracks are included alongside file tracks."
(unwind-protect
(let* ((buf (get-buffer-create cj/music-playlist-buffer-name)))
(with-current-buffer buf
(emms-playlist-mode)
(setq emms-playlist-buffer-p t)
(let ((inhibit-read-only t))
(erase-buffer)
(emms-playlist-insert-track (emms-track 'file "/music/local.mp3"))
(emms-playlist-insert-track (emms-track 'url "http://stream.example.com/radio"))))
(setq emms-playlist-buffer buf)
(let ((result (cj/music--playlist-tracks)))
(should (= 2 (length result)))
(should (equal (nth 0 result) "/music/local.mp3"))
(should (equal (nth 1 result) "http://stream.example.com/radio"))))
(test-tracks--teardown)))
;;; Error Cases
(ert-deftest test-music-config--playlist-tracks-error-no-buffer-creates-one ()
"When playlist buffer doesn't exist, ensure-playlist-buffer creates it."
(unwind-protect
(progn
;; Kill any existing buffer
(when-let ((buf (get-buffer cj/music-playlist-buffer-name)))
(kill-buffer buf))
;; Should create buffer and return empty list
(should-not (cj/music--playlist-tracks))
;; Buffer should now exist
(should (get-buffer cj/music-playlist-buffer-name)))
(test-tracks--teardown)))
(provide 'test-music-config--playlist-tracks)
;;; test-music-config--playlist-tracks.el ends here
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