Remove value from LinkButtonElement, fix test (#563)

Author: pedromcaraujo

slack/web/classes/elements.py

@@ -159,6 +159,13 @@ def __init__(self, *, text: str, url: str, style: Optional[str] = None):
     def url_length(self):
         return len(self.url) <= self.url_max_length
 
+    def to_dict(self) -> dict:
+        json = super().to_dict()
+        # LinkButtonElements don't use the value property so we can just remove it
+        if "value" in json:
+            del json["value"]
+        return json
+
 
 class AbstractSelector(InteractiveElement, metaclass=ABCMeta):
     placeholder_max_length = 150

tests/web/classes/test_elements.py

@@ -84,7 +84,6 @@ def test_json(self):
                 "text": {"emoji": True, "text": "button text", "type": "plain_text"},
                 "url": "http://google.com",
                 "type": "button",
-                "value": "",
                 "action_id": button.action_id,
             },
         )