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+;;; test-dirvish-config-file-manager-program.el --- Tests for the file-manager dispatch -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; `cj/--file-manager-program-for' is the pure dispatch behind
+;; `cj/dirvish-open-file-manager-here'.  Given whether xdg-open is
+;; present and the running `system-type', it returns the program name
+;; the wrapper should call -- or nil to signal the wrapper should fall
+;; back to a shell-command.  Keeping `executable-find' and `system-type'
+;; outside lets the helper be tested without faking the live machine.
+
+;;; Code:
+
+(require 'ert)
+(require 'package)
+
+(setq package-user-dir (expand-file-name "elpa" user-emacs-directory))
+(package-initialize)
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(add-to-list 'load-path (expand-file-name "elpa/dirvish-2.3.0/extensions"
+                                          user-emacs-directory))
+(require 'user-constants)
+(require 'keybindings)
+(require 'dirvish-config)
+
+(ert-deftest test-cj--file-manager-program-for-xdg-open-on-linux ()
+  "Normal: xdg-open present on Linux returns xdg-open."
+  (should (equal (cj/--file-manager-program-for t 'gnu/linux)
+                 "xdg-open")))
+
+(ert-deftest test-cj--file-manager-program-for-xdg-open-wins-on-macos ()
+  "Boundary: xdg-open present even on macOS returns xdg-open (Linux-isms ported)."
+  (should (equal (cj/--file-manager-program-for t 'darwin)
+                 "xdg-open")))
+
+(ert-deftest test-cj--file-manager-program-for-darwin-no-xdg ()
+  "Normal: macOS without xdg-open returns open."
+  (should (equal (cj/--file-manager-program-for nil 'darwin)
+                 "open")))
+
+(ert-deftest test-cj--file-manager-program-for-windows-no-xdg ()
+  "Normal: Windows without xdg-open returns explorer."
+  (should (equal (cj/--file-manager-program-for nil 'windows-nt)
+                 "explorer")))
+
+(ert-deftest test-cj--file-manager-program-for-linux-without-xdg-falls-back ()
+  "Boundary: Linux without xdg-open returns nil so the wrapper shells out."
+  (should-not (cj/--file-manager-program-for nil 'gnu/linux)))
+
+(ert-deftest test-cj--file-manager-program-for-unknown-system-falls-back ()
+  "Boundary: an unknown `system-type' with no xdg-open returns nil."
+  (should-not (cj/--file-manager-program-for nil 'haiku)))
+
+(provide 'test-dirvish-config-file-manager-program)
+;;; test-dirvish-config-file-manager-program.el ends here