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+;;; test-prog-general--find-file-respecting-split.el --- split-aware file open -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; `cj/--find-file-respecting-split' opens a file in another window when the
+;; frame is split and in the current window otherwise.  It backs
+;; `cj/open-project-root-todo' (C-c p t) so the project todo lands in the
+;; other pane instead of replacing the buffer in the selected window.
+;;
+;; `find-file' / `find-file-other-window' are stubbed -- they are the file-I/O
+;; boundary -- while the window layout is real.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'prog-general)
+
+(ert-deftest test-prog-general--find-file-respecting-split-single-window-uses-current ()
+  "Normal: a single-window frame opens the file in the current window."
+  (save-window-excursion
+    (delete-other-windows)
+    (let (current-arg other-called)
+      (cl-letf (((symbol-function 'find-file)
+                 (lambda (f) (setq current-arg f)))
+                ((symbol-function 'find-file-other-window)
+                 (lambda (_f) (setq other-called t))))
+        (cj/--find-file-respecting-split "/tmp/proj/todo.org"))
+      (should (equal current-arg "/tmp/proj/todo.org"))
+      (should-not other-called))))
+
+(ert-deftest test-prog-general--find-file-respecting-split-two-windows-uses-other ()
+  "Normal: a two-window split opens the file in the other window."
+  (save-window-excursion
+    (delete-other-windows)
+    (split-window-right)
+    (let (other-arg current-called)
+      (cl-letf (((symbol-function 'find-file-other-window)
+                 (lambda (f) (setq other-arg f)))
+                ((symbol-function 'find-file)
+                 (lambda (_f) (setq current-called t))))
+        (cj/--find-file-respecting-split "/tmp/proj/todo.org"))
+      (should (equal other-arg "/tmp/proj/todo.org"))
+      (should-not current-called))))
+
+(ert-deftest test-prog-general--find-file-respecting-split-three-windows-uses-other ()
+  "Boundary: more than two windows still counts as split -> other window."
+  (save-window-excursion
+    (delete-other-windows)
+    (split-window-right)
+    (split-window-below)
+    (let (other-called current-called)
+      (cl-letf (((symbol-function 'find-file-other-window)
+                 (lambda (_f) (setq other-called t)))
+                ((symbol-function 'find-file)
+                 (lambda (_f) (setq current-called t))))
+        (cj/--find-file-respecting-split "/tmp/proj/todo.org"))
+      (should other-called)
+      (should-not current-called))))
+
+(provide 'test-prog-general--find-file-respecting-split)
+;;; test-prog-general--find-file-respecting-split.el ends here