diff --git a/collects/tests/units/test-unit-contracts.ss b/collects/tests/units/test-unit-contracts.ss
new file mode 100644
index 0000000000..1320dab453
--- /dev/null
+++ b/collects/tests/units/test-unit-contracts.ss
@@ -0,0 +1,31 @@
+(require "test-harness.ss"
+         scheme/unit)
+
+(define-signature sig1
+  ((contracted [x number?])))
+(define-signature sig2
+  ((contracted [f (-> number? number?))))
+(define-signature sig3 extends sig2
+  ((contracted [g (-> number? boolean?))))
+(define-signature sig4
+  ((contracted [a number?] [b (-> boolean? number?)])))
+(define-signature sig5
+  ((contracted [c string?])
+   (contracted [d symbol?])))
+
+(define-unit unit1
+  (import sig1)
+  (export sig2)
+  (define (f n) x))
+
+(define-unit unit2
+  (import sig3 sig4)
+  (export)
+
+  (b (g a)))
+
+(define-unit unit3
+  (import)
+  (export sig5)
+
+  (define-values (c d) (values "foo" 'a)))