fix a bug in db.tester

basis/db/tester/tester.factor

@@ -3,7 +3,7 @@
 USING: concurrency.combinators db.pools db.sqlite db.tuples
 db.types kernel math random threads tools.test db sequences
 io prettyprint db.postgresql db.sqlite accessors io.files.temp
-namespaces fry system ;
+namespaces fry system math.parser ;
 IN: db.tester
 
 : postgresql-test-db ( -- postgresql-db )
@@ -67,8 +67,8 @@ test-2 "TEST2" {
             drop
             10 [
                 dup [
-                    f 100 random 100 random 100 random test-1 boa
-                    insert-tuple yield
+                    f 100 random 100 random 100 random [ number>string ] tri@
+                    test-1 boa insert-tuple yield
                 ] with-db
             ] times
         ] with parallel-each