1 files changed, 26 insertions, 0 deletions
diff --git a/tests/test.scm b/tests/test.scm
index 6ce798e..562c736 100755
--- a/tests/test.scm
+++ b/tests/test.scm
@@ -51,3 +51,29 @@
 
 
 (test-end "state-test")
+
+(test-begin "writer-test")
+
+(use-modules (monad writer))
+
+(test-equal '(10 "HelloWorld")
+  (run-writer
+   (do (w "Hello")
+       (w "World")
+     (return-writer 10))))
+
+(test-equal '(10 "HelloWorld")
+  (run-writer
+   (do "Hello" "World"
+     (return-writer 10))))
+
+(test-equal '(3 "Applied + to (1 2) ⇒ 3\n")
+  (run-writer (with-writer + 1 2)))
+
+(test-equal '(10 "Hello, World")
+  (run-writer
+   (do (string-append "Hello" ", ")
+       "World"
+     (return-writer 10))))
+
+(test-end "writer-test")