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+;;; test-org-config--org-follow-link-same-window.el --- same-window link follow -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; `cj/--org-follow-link-same-window' follows the Org link at point, opening
+;; file: links in the *current* window instead of org's default other-window
+;; (`org-link-frame-setup' file entry).  It is the kernel behind the S-mouse-1
+;; and mouse-3 bindings (`cj/org-follow-link-at-mouse-same-window').  Off a
+;; link it does nothing, so a right-click in empty space is a silent no-op
+;; rather than org's "No link found" user-error.
+;;
+;; `org-open-at-point' (the visit boundary) is stubbed to record whether it
+;; was called and what the file entry of `org-link-frame-setup' resolved to at
+;; call time; real temp Org buffers place point on / off a link.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(require 'org)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'org-config)
+
+(ert-deftest test-org-config-follow-link-same-window-file-link ()
+  "Normal: on a file link, follow it with the file frame-setup as find-file."
+  (with-temp-buffer
+    (let ((org-mode-hook nil)
+          (frame-file nil)
+          (called nil))
+      (insert "see [[file:/tmp/notes.org][notes]] here")
+      (org-mode)
+      (goto-char (point-min))
+      (search-forward "notes]")
+      (backward-char 2)                 ; land inside the link's description
+      (cl-letf (((symbol-function 'org-open-at-point)
+                 (lambda (&rest _)
+                   (setq called t
+                         frame-file (cdr (assq 'file org-link-frame-setup))))))
+        (cj/--org-follow-link-same-window))
+      (should called)
+      (should (eq frame-file 'find-file)))))
+
+(ert-deftest test-org-config-follow-link-same-window-off-link-noop ()
+  "Boundary: off any link, do nothing (no error, no visit)."
+  (with-temp-buffer
+    (let ((org-mode-hook nil)
+          (called nil))
+      (insert "plain text, no link at all")
+      (org-mode)
+      (goto-char (point-min))
+      (cl-letf (((symbol-function 'org-open-at-point)
+                 (lambda (&rest _) (setq called t))))
+        (cj/--org-follow-link-same-window))
+      (should-not called))))
+
+(ert-deftest test-org-config-follow-link-same-window-http-link ()
+  "Boundary: on a non-file link, still follow it (frame-setup is harmless)."
+  (with-temp-buffer
+    (let ((org-mode-hook nil)
+          (called nil))
+      (insert "site [[https://example.com][example]] end")
+      (org-mode)
+      (goto-char (point-min))
+      (search-forward "example]")
+      (backward-char 2)
+      (cl-letf (((symbol-function 'org-open-at-point)
+                 (lambda (&rest _) (setq called t))))
+        (cj/--org-follow-link-same-window))
+      (should called))))
+
+(provide 'test-org-config--org-follow-link-same-window)
+;;; test-org-config--org-follow-link-same-window.el ends here