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+;;; test-vterm-toggle--display.el --- Tests for the F12 display-saved action -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Covers the F12-side equivalents of the ai-vterm display tests:
+;; geometry capture (window-direction, window-size with 'below
+;; default), capture-state writing module-level vars, and the custom
+;; display action mapping cardinal -> edge directions.  Tests stub
+;; `display-buffer-in-direction' to capture the alist that would
+;; have reached it.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'eshell-vterm-config)
+
+(ert-deftest test-vterm-toggle--window-direction-single-window-defaults-to-below ()
+  "Boundary: full-frame window -> default 'below for F12."
+  (save-window-excursion
+    (delete-other-windows)
+    (should (eq (cj/--vterm-toggle-window-direction (selected-window))
+                'below))))
+
+(ert-deftest test-vterm-toggle--window-direction-below-split ()
+  "Normal: bottom window of horizontal split -> 'below."
+  (save-window-excursion
+    (delete-other-windows)
+    (let ((below (split-window (selected-window) nil 'below)))
+      (should (eq (cj/--vterm-toggle-window-direction below) 'below)))))
+
+(ert-deftest test-vterm-toggle--window-direction-right-split ()
+  "Normal: right window of vertical split -> 'right."
+  (save-window-excursion
+    (delete-other-windows)
+    (let ((right (split-window (selected-window) nil 'right)))
+      (should (eq (cj/--vterm-toggle-window-direction right) 'right)))))
+
+(ert-deftest test-vterm-toggle--window-size-returns-body ()
+  "Normal: returns body-width for right/left, body-height for below/above."
+  (save-window-excursion
+    (delete-other-windows)
+    (let ((below (split-window (selected-window) nil 'below)))
+      (should (= (cj/--vterm-toggle-window-size below 'below)
+                 (window-body-height below))))))
+
+(ert-deftest test-vterm-toggle--capture-state-records-direction-and-size ()
+  "Normal: capture-state writes direction and integer body size."
+  (save-window-excursion
+    (delete-other-windows)
+    (let ((below (split-window (selected-window) nil 'below))
+          (cj/--vterm-toggle-last-direction nil)
+          (cj/--vterm-toggle-last-size nil))
+      (cj/--vterm-toggle-capture-state below)
+      (should (eq cj/--vterm-toggle-last-direction 'below))
+      (should (integerp cj/--vterm-toggle-last-size))
+      (should (= cj/--vterm-toggle-last-size (window-body-height below))))))
+
+(ert-deftest test-vterm-toggle--capture-state-noop-on-dead-window ()
+  "Boundary: nil window -> state remains unchanged."
+  (let ((cj/--vterm-toggle-last-direction 'sentinel)
+        (cj/--vterm-toggle-last-size 0.123))
+    (cj/--vterm-toggle-capture-state nil)
+    (should (eq cj/--vterm-toggle-last-direction 'sentinel))
+    (should (= cj/--vterm-toggle-last-size 0.123))))
+
+(ert-deftest test-vterm-toggle--display-saved-defaults-when-state-nil ()
+  "Normal: nil state -> direction=bottom, size=cj/vterm-toggle-window-height."
+  (let (received-alist
+        (cj/--vterm-toggle-last-direction nil)
+        (cj/--vterm-toggle-last-size nil)
+        (cj/vterm-toggle-window-height 0.7))
+    (cl-letf (((symbol-function 'display-buffer-in-direction)
+               (lambda (_b a) (setq received-alist a) 'fake-window)))
+      (cj/--vterm-toggle-display-saved 'fake-buf '((inhibit-same-window . t))))
+    (should (eq (cdr (assq 'direction received-alist)) 'bottom))
+    (should (= (cdr (assq 'window-height received-alist)) 0.7))
+    (should (eq (cdr (assq 'inhibit-same-window received-alist)) t))))
+
+(ert-deftest test-vterm-toggle--display-saved-maps-cardinal-to-edge ()
+  "Normal: saved 'below maps to bottom edge; integer size wraps in body-lines."
+  (let (received-alist
+        (cj/--vterm-toggle-last-direction 'below)
+        (cj/--vterm-toggle-last-size 12))
+    (cl-letf (((symbol-function 'display-buffer-in-direction)
+               (lambda (_b a) (setq received-alist a) 'fake-window)))
+      (cj/--vterm-toggle-display-saved 'fake-buf nil))
+    (should (eq (cdr (assq 'direction received-alist)) 'bottom))
+    (should (equal (cdr (assq 'window-height received-alist))
+                   '(body-lines . 12)))
+    (should-not (assq 'window-width received-alist))))
+
+(ert-deftest test-vterm-toggle--display-saved-strips-conflicting-alist-entries ()
+  "Boundary: caller-supplied direction/size are stripped, saved values win."
+  (let (received-alist
+        (cj/--vterm-toggle-last-direction 'right)
+        (cj/--vterm-toggle-last-size 30))
+    (cl-letf (((symbol-function 'display-buffer-in-direction)
+               (lambda (_b a) (setq received-alist a) 'fake-window)))
+      (cj/--vterm-toggle-display-saved
+       'fake-buf
+       '((direction . above)
+         (window-width . 0.2)
+         (window-height . 0.3)
+         (inhibit-same-window . t))))
+    (should (eq (cdr (assq 'direction received-alist)) 'rightmost))
+    (should (equal (cdr (assq 'window-width received-alist))
+                   '(body-columns . 30)))
+    (let ((wh-cells (cl-remove-if-not
+                     (lambda (cell) (eq (car-safe cell) 'window-height))
+                     received-alist)))
+      (should (null wh-cells)))))
+
+(provide 'test-vterm-toggle--display)
+;;; test-vterm-toggle--display.el ends here