1 files changed, 43 insertions, 2 deletions
diff --git a/tests/struct.scm b/tests/struct.scm
index 01c984d..4eef204 100644
--- a/tests/struct.scm
+++ b/tests/struct.scm
@@ -48,11 +48,52 @@
   (define-struct <animal> species)
   (define-struct <dog> breed)
   (let ((my-dog (make-struct <dog> "Labrador")))
-    (test-assert (instance-of? <dog> my-dog))
-    (test-assert (not (instance-of? <animal> my-dog)))))
+    (test-assert (instance-of? my-dog <dog>))
+    (test-assert (not (instance-of? my-dog <animal>)))))
 
 (test-group "error-handling"
   (define-struct <empty>)
   (test-error #t (make-struct <empty> 1)))
 
+(test-group "json-serialization"
+  (define-struct <point> x y)
+  (define-struct <user> name age active)
+  (define-struct <empty>)
+
+  (let ((p (make-struct <point> 10 20)))
+    (test-equal (struct->json-string p) "{\"x\":10,\"y\":20}"))
+
+  (let ((p (make-struct <point> 10 20)))
+    (test-equal p (json-string->struct (record-type-descriptor p) (struct->json-string p))))
+
+  (let ((u (make-struct <user> "Bob" 42 #t)))
+    (test-equal (struct->json-string u) "{\"name\":\"Bob\",\"age\":42,\"active\":true}"))
+
+  (let ((u (make-struct <user> "Bob" 42 #t)))
+    (test-equal u (json-string->struct (record-type-descriptor u) (struct->json-string u))))
+
+  (let ((e (make-struct <empty>)))
+    (test-equal (struct->json-string e) "{}"))
+
+  (let ((e (make-struct <empty>)))
+    (test-equal (json-string->struct (record-type-descriptor e) "{}") e))
+
+  (let ((u (make-struct <user> "Alice" 30 #f)))
+    (let* ((json (struct->json-string u))
+           (u2 (json-string->struct (record-type-descriptor u) json)))
+      (test-equal u u2)))
+
+  (let ((p (make-struct <point> 1.5 2.5)))
+    (test-equal (json-string->struct (record-type-descriptor p) (struct->json-string p)) p))
+
+  (let ((u (make-struct <user> "" 0 #f)))
+    (test-equal (json-string->struct (record-type-descriptor u) (struct->json-string u)) u))
+
+  (let* ((p1 (make-struct <point> 1 2))
+         (p2 (make-struct <point> 3 4))
+         (json1 (struct->json-string p1))
+         (json2 (struct->json-string p2)))
+    (test-equal (json-string->struct (record-type-descriptor p1) json1) p1)
+    (test-equal (json-string->struct (record-type-descriptor p2) json2) p2)))
+
 (test-end "weeb-struct")