fix test

vlib/json/tests/json_decode_struct_with_default_test.v

@@ -1,5 +1,3 @@
-module main
-
 import json
 
 pub struct Response {
@@ -11,14 +9,26 @@ pub:
 
 pub struct Result {
 pub:
-	id         int    @[json: defid]
-	author     string @[json: author]
-	definition string @[json: definition]
+	id            int      @[json: defid]
+	author        string   @[json: author]
+	definition    string   @[json: definition]
+	link          string   @[json: permalink]
+	thumbs_down   int      @[json: thumbs_down]
+	thumbs_up     int      @[json: thumbs_up]
+	word          string   @[json: word]
+	date          string   @[json: written_on]
+	audio_samples []string @[json: sound_urls]
+	example       string   @[json: example]
+}
+
+pub fn define(word string) !&Response {
+	resp := '{"list":[{"defid":3439287}]}'
+	response := json.decode(Response, resp) or { return err }
+	return &response
 }
 
 fn test_main() {
-	resp := '{"list": [{"defid":123, "author": "", "definition": "" }]}'
-	response := json.decode(Response, resp)!
+	response := define('')!
 	assert response.results.len > 0
-	assert response.results[0].id == 123
+	assert response.results[0].id == 3439287
 }