add provide+safe to `sugar/test`

sugar/main.rkt

@@ -19,4 +19,5 @@
 (r+p "list.rkt")
 (r+p "misc.rkt")
 (r+p "string.rkt")
+(r+p "test.rkt")
 (r+p "xml.rkt")

sugar/test.rkt

@@ -1,7 +1,7 @@
 #lang racket/base
 (require (for-syntax racket/base))
-(provide (all-defined-out))
-
+(require sugar/define)
+(provide+safe module-test-external module-test-internal module-test-internal+external)
 
 ;; tests using module-boundary contracts
 (define-syntax (module-test-external stx)