test/json: test array en-/decoding

[fAuernigg]

JSON array encoding is wrong
This is a unit test to show the bug.

e.g.

[0]

Fix will follow.

[alfredh]

Can you please rebase to main, which fixes a run-on-arch CI bug ?

[cspiel1]

For now there is only the new unit test. It needs a parsing/encoding fix.
@fAuernigg or me will try to fix this next week.

[sreimers]

Not a easy problem to fix and keep backwards compatibility, since always a object is expected on first level for json, the clean solution would be something like this:

+++ b/src/json/decode_odict.c
@@ -114,8 +114,24 @@ int json_decode_odict(struct odict **op, uint32_t hash_size, const char *str,
        if (err)
                return err;
 
+       struct json_handlers h = {object_handler, array_handler,
+                                 object_entry_handler, array_entry_handler,
+                                 o};
+
+       switch (*str) {
+               case '{':
+                       container_add(NULL, 0, ODICT_OBJECT, &h);
+                       break;
+               case '[':
+                       container_add(NULL, 0, ODICT_ARRAY, &h);
+                       break;
+               default:
+                       return EBADMSG;
+       }
+
+
        err = json_decode(str, len, maxdepth, object_handler, array_handler,
-                         object_entry_handler, array_entry_handler, o);
+                         object_entry_handler, array_entry_handler, h.arg);
        if (err)
                mem_deref(o);
        else

[sreimers]

Here is a quick example without breaking the api:

#1301