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;;; test-ai-term--next-single-agent.el --- cj/ai-term-next sole-agent message -*- lexical-binding: t; -*-
;;; Commentary:
;; When M-SPC fires with a single ai-term open and that agent's window
;; selected, `cj/ai-term-next' has nowhere to go: the rotation wraps back
;; to the same agent. Instead of a misleading "Agent: <name>" swap
;; message, it should say there are no other ai-terms to switch to.
;; A sole agent that is displayed but NOT selected still gets selected
;; (the swap key doubles as "take me to the agent"), and a sole agent
;; with no window still gets shown.
;;; Code:
(require 'ert)
(require 'cl-lib)
(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
(require 'ai-term)
(defun test-ai-term-next-single--buffer-name (dir)
"Deterministic fake agent buffer name for DIR."
(concat "agent-buf-" dir))
(ert-deftest test-ai-term-next-single-agent-focused-messages-no-others ()
"Normal: sole agent focused -> echo 'no other ai-terms', no swap."
(let ((buf (get-buffer-create "agent-buf-a"))
(captured nil)
(shown 0))
(unwind-protect
(progn
(set-window-buffer (selected-window) buf)
(cl-letf (((symbol-function 'cj/--ai-term-active-agent-dirs)
(lambda (&rest _) '("a")))
((symbol-function 'cj/--ai-term-displayed-agent-window)
(lambda (&rest _) (selected-window)))
((symbol-function 'cj/--ai-term-buffer-name)
#'test-ai-term-next-single--buffer-name)
((symbol-function 'cj/--ai-term-process-live-p)
(lambda (&rest _) t))
((symbol-function 'cj/--ai-term-show-or-create)
(lambda (&rest _) (setq shown (1+ shown))))
((symbol-function 'message)
(lambda (fmt &rest args)
(when fmt (setq captured (apply #'format fmt args))))))
(cj/ai-term-next)
(should (equal captured "No other ai-terms to switch to"))
(should (= shown 0))
(should (eq (window-buffer (selected-window)) buf))))
(kill-buffer buf))))
(ert-deftest test-ai-term-next-single-agent-undisplayed-shows-it ()
"Normal: sole agent with no window -> shown, not the no-others message."
(let ((captured nil)
(shown 0))
(cl-letf (((symbol-function 'cj/--ai-term-active-agent-dirs)
(lambda (&rest _) '("a")))
((symbol-function 'cj/--ai-term-displayed-agent-window)
(lambda (&rest _) nil))
((symbol-function 'cj/--ai-term-buffer-name)
#'test-ai-term-next-single--buffer-name)
((symbol-function 'cj/--ai-term-process-live-p)
(lambda (&rest _) t))
((symbol-function 'cj/--ai-term-show-or-create)
(lambda (&rest _) (setq shown (1+ shown))))
((symbol-function 'message)
(lambda (fmt &rest args)
(when fmt (setq captured (apply #'format fmt args))))))
(cj/ai-term-next)
(should (= shown 1))
(should-not (equal captured "No other ai-terms to switch to")))))
(ert-deftest test-ai-term-next-single-agent-unselected-window-gets-selected ()
"Boundary: sole agent displayed in another window -> selected, no message change."
(skip-unless (not noninteractive)) ; window splitting is unreliable in batch
(let ((buf (get-buffer-create "agent-buf-a"))
(captured nil))
(unwind-protect
(let* ((w1 (selected-window))
(w2 (split-window)))
(set-window-buffer w2 buf)
(cl-letf (((symbol-function 'cj/--ai-term-active-agent-dirs)
(lambda (&rest _) '("a")))
((symbol-function 'cj/--ai-term-displayed-agent-window)
(lambda (&rest _) w2))
((symbol-function 'cj/--ai-term-buffer-name)
#'test-ai-term-next-single--buffer-name)
((symbol-function 'cj/--ai-term-process-live-p)
(lambda (&rest _) t))
((symbol-function 'message)
(lambda (fmt &rest args)
(when fmt (setq captured (apply #'format fmt args))))))
(select-window w1)
(cj/ai-term-next)
(should (eq (selected-window) w2))
(should-not (equal captured "No other ai-terms to switch to"))))
(delete-other-windows)
(kill-buffer buf))))
(ert-deftest test-ai-term-next-two-agents-still-swaps ()
"Normal: two agents, one focused -> swaps silently to the other.
The modeline announces the agent (buffer name + eat state), so the swap
emits no echo-area message (2026-07-02: the \"Agent: <name>\" echo was
dropped as clutter duplicating the modeline)."
(let ((buf-a (get-buffer-create "agent-buf-a"))
(buf-b (get-buffer-create "agent-buf-b"))
(captured nil))
(unwind-protect
(progn
(set-window-buffer (selected-window) buf-a)
(cl-letf (((symbol-function 'cj/--ai-term-active-agent-dirs)
(lambda (&rest _) '("a" "b")))
((symbol-function 'cj/--ai-term-displayed-agent-window)
(lambda (&rest _) (selected-window)))
((symbol-function 'cj/--ai-term-buffer-name)
#'test-ai-term-next-single--buffer-name)
((symbol-function 'cj/--ai-term-process-live-p)
(lambda (&rest _) t))
((symbol-function 'message)
(lambda (fmt &rest args)
(when fmt (setq captured (apply #'format fmt args))))))
(cj/ai-term-next)
(should (eq (window-buffer (selected-window)) buf-b))
(should-not captured)))
(kill-buffer buf-a)
(kill-buffer buf-b))))
(provide 'test-ai-term--next-single-agent)
;;; test-ai-term--next-single-agent.el ends here
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