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diff --git a/tests/test-keybindings--jump-open-var.el b/tests/test-keybindings--jump-open-var.el
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+;;; test-keybindings--jump-open-var.el --- Tests for cj/jump-open-var -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for `cj/jump-open-var' in keybindings.el.  The helper takes a
+;; variable symbol, validates that the variable is bound, holds a
+;; non-empty string, and points at an existing file, then opens it via
+;; `find-file'.  Each failure path raises `user-error'.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'keybindings)
+
+(defvar test-keybindings--fixture-var nil
+  "Shared fixture variable for `cj/jump-open-var' tests.
+Declared at top level so `let'-binding inside tests sees it as special
+under lexical-binding.")
+
+(defmacro test-keybindings--with-find-file-mock (capture-var &rest body)
+  "Run BODY with `find-file' replaced by a mock that captures its arg.
+CAPTURE-VAR is set to the path passed to `find-file', or stays nil if
+the mock is never called."
+  (declare (indent 1) (debug t))
+  `(cl-letf (((symbol-function 'find-file)
+              (lambda (path) (setq ,capture-var path))))
+     ,@body))
+
+(defmacro test-keybindings--with-fixture (value &rest body)
+  "Bind `test-keybindings--fixture-var' to VALUE for BODY, then reset."
+  (declare (indent 1) (debug t))
+  `(unwind-protect
+       (progn (setq test-keybindings--fixture-var ,value) ,@body)
+     (setq test-keybindings--fixture-var nil)))
+
+;;; Normal cases
+
+(ert-deftest test-keybindings-jump-open-var-existing-file-calls-find-file ()
+  "Normal: bound var holding a path to an existing file calls `find-file'."
+  (let ((tmp (make-temp-file "jump-test-")))
+    (unwind-protect
+        (test-keybindings--with-fixture tmp
+          (let (captured)
+            (test-keybindings--with-find-file-mock captured
+              (cj/jump-open-var 'test-keybindings--fixture-var)
+              (should (equal captured tmp)))))
+      (when (file-exists-p tmp) (delete-file tmp)))))
+
+;;; Boundary / Error cases
+
+(ert-deftest test-keybindings-jump-open-var-unbound-raises ()
+  "Error: an unbound variable raises `user-error' naming the variable."
+  (let ((sym (make-symbol "test-keybindings--unbound")))
+    (let ((err (should-error (cj/jump-open-var sym) :type 'user-error)))
+      (should (string-match-p (symbol-name sym)
+                              (error-message-string err))))))
+
+(ert-deftest test-keybindings-jump-open-var-nil-value-raises ()
+  "Error: a variable bound to nil raises `user-error'."
+  (test-keybindings--with-fixture nil
+    (should-error (cj/jump-open-var 'test-keybindings--fixture-var)
+                  :type 'user-error)))
+
+(ert-deftest test-keybindings-jump-open-var-non-string-raises ()
+  "Error: a variable bound to a non-string raises `user-error'."
+  (test-keybindings--with-fixture 42
+    (should-error (cj/jump-open-var 'test-keybindings--fixture-var)
+                  :type 'user-error)))
+
+(ert-deftest test-keybindings-jump-open-var-empty-string-raises ()
+  "Error: a variable bound to the empty string raises `user-error'."
+  (test-keybindings--with-fixture ""
+    (should-error (cj/jump-open-var 'test-keybindings--fixture-var)
+                  :type 'user-error)))
+
+(ert-deftest test-keybindings-jump-open-var-missing-file-raises ()
+  "Error: a path to a non-existent file raises `user-error' naming the path."
+  (let ((missing-path (concat temporary-file-directory
+                              "definitely-not-here-"
+                              (number-to-string (random 1000000)) ".org")))
+    (should-not (file-exists-p missing-path))
+    (test-keybindings--with-fixture missing-path
+      (let ((err (should-error
+                  (cj/jump-open-var 'test-keybindings--fixture-var)
+                  :type 'user-error)))
+        (should (string-match-p (regexp-quote missing-path)
+                                (error-message-string err)))))))
+
+(provide 'test-keybindings--jump-open-var)
+;;; test-keybindings--jump-open-var.el ends here