USING: accessors boxes namespaces tools.test ;

{ } [ <box> "b" set ] unit-test

{ } [ 3 "b" get >box ] unit-test

{ t } [ "b" get occupied>> ] unit-test

[ 4 "b" >box ] must-fail

{ 3 } [ "b" get box> ] unit-test

{ f } [ "b" get occupied>> ] unit-test

[ "b" get box> ] must-fail

{ f f } [ "b" get ?box ] unit-test

{ } [ 12 "b" get >box ] unit-test

{ 12 t } [ "b" get ?box ] unit-test

{ f } [ "b" get occupied>> ] unit-test