implemented

tests/basic.rkt

@@ -3,8 +3,17 @@
 (require rackunit
          racket-tray)
 
-;; The public module must be loadable on non-Windows platforms as well.
+;; The public module must be loadable on every platform, even when no tray
+;; backend is available for the current operating system.
 (check-true (procedure? mk-tray))
 (check-true (procedure? tray-close))
 (check-true (procedure? tray-set-icon!))
 (check-true (procedure? tray-set-menu!))
+
+;; Keep the keyword part of the public API testable without constructing a GUI
+;; window or depending on Windows being available on the package build host.
+(define-values (required-keywords allowed-keywords)
+  (procedure-keywords mk-tray))
+
+(check-equal? required-keywords '())
+(check-not-false (member '#:hide-on-minimize? allowed-keywords))