Fix another of the tests for units.

svn: r16452

collects/tests/units/multi-mod-sigs.ss

@@ -6,14 +6,14 @@
      b)))
 
 (module test2 mzscheme
-  (require mzlib/unit test1)
+  (require mzlib/unit 'test1)
   (provide s2)
   (define-signature s2 extends s1
     ((define-values (c) (list b a d))
      d)))
 
 (module test3 mzscheme
-  (require mzlib/unit test1 test2)
+  (require mzlib/unit 'test1 'test2)
   (provide (all-defined))
   (define-unit u1 (import s1) (export)
     (list a b))
@@ -27,7 +27,7 @@
 
 
 (module test4 mzscheme
-  (require mzlib/unit test1 test2 test3)
+  (require mzlib/unit 'test1 'test2 'test3)
   (require "test-harness.ss")
   (test '(101 100)
    (invoke-unit 
@@ -52,4 +52,4 @@
   
   )
 
-(require test4)
+(require 'test4)