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ref: d356142c8d2e4518614ea28acce1f9a5d7b8044c
dir: /tests/variable.zuo/

#lang zuo

(require "harness.zuo")

(alert "variables")

(check (variable? (variable 'alice)))
(check (not (variable? 'alice)))

(check-fail (variable-ref (variable 'alice)) "undefined: alice")
(check-fail (variable-ref 'alice) "not a variable")

(check (let ([a (variable 'alice)])
         (variable-set! a 'home)
         (list (variable-ref a) (variable-ref a)))
       '(home home))
(check-fail (let ([a (variable 'alice)])
              (variable-set! a 'home)
              (variable-set! a 'home))
            "variable already has a value")
(check-fail (variable-set! 'alice 'home) "not a variable")

(check-arg-fail (variable 10) "not a symbol")