tests: added accessibility tests (#67)

Author: mxschmitt

playwright/accessibility.py

@@ -22,9 +22,9 @@ def __init__(self, channel: Channel) -> None:
         self._channel = channel
 
     async def snapshot(
-        self, interestingOnly: bool = None, root: ElementHandle = None
+        self, interestingOnly: bool = True, root: ElementHandle = None
     ) -> Dict:
         root = root._channel if root else None
         return await self._channel.send(
-            "snapshot", dict(root=root, interestingOnly=interestingOnly)
+            "accessibilitySnapshot", dict(root=root, interestingOnly=interestingOnly)
         )