add dependencies from test modules

htdp-trace/info.rkt

@@ -2,7 +2,9 @@
 
 (define collection "htdp-trace")
 (define deps '("base"))
-(define build-deps '("sandbox-lib"
+(define build-deps '("htdp-lib"
+                     "rackunit-lib"
+                     "sandbox-lib"
                      "scribble-lib" "racket-doc"))
 
 (define scribblings '(("scribblings/htdp-trace.scrbl")))