Add test for generator functions

test.scm

@@ -1,5 +1,6 @@
 (use-modules (d-)
-	     (rnrs base))
+	     (rnrs base)
+	     (srfi srfi-1))
 
 (define-syntax-rule (define-unit-test (test-name body ...))
   (let () body ...))
@@ -54,3 +55,15 @@
 (define-test argmin
   (test
    (assert (equal? (argmin cdr < '(a . 5) '(b . 2) '(c . 3)) '(b . 2)))))
+
+(define-test make-generator
+  (test
+   (define number-generator
+     (make-generator (lambda (yield)
+		       (let loop ([i 1])
+			 (yield i)
+			 (loop (1+ i))))))
+   (assert (= (number-generator) 1))
+   (assert (= (number-generator) 2))
+   (assert (= (number-generator) 3))
+   (assert (= (number-generator) 4))))