Handle poll votes

test/fixtures/mastodon-vote.json

@@ -0,0 +1,16 @@
+{
+  "@context": "https://www.w3.org/ns/activitystreams",
+  "actor": "https://mastodon.sdf.org/users/rinpatch",
+  "id": "https://mastodon.sdf.org/users/rinpatch#votes/387/activity",
+  "nickname": "rin",
+  "object": {
+    "attributedTo": "https://mastodon.sdf.org/users/rinpatch",
+    "id": "https://mastodon.sdf.org/users/rinpatch#votes/387",
+    "inReplyTo": "https://testing.uguu.ltd/objects/9d300947-2dcb-445d-8978-9a3b4b84fa14",
+    "name": "suya..",
+    "to": "https://testing.uguu.ltd/users/rin",
+    "type": "Note"
+  },
+  "to": "https://testing.uguu.ltd/users/rin",
+  "type": "Create"
+}

test/web/activity_pub/transmogrifier_test.exs

@@ -130,6 +130,37 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
              end)
     end
 
+    test "in increments vote counters on question activities" do
+      user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post(user, %{
+          "status" => "suya...",
+          "poll" => %{"options" => ["suya", "suya.", "suya.."], "expires_in" => 10}
+        })
+
+      object = Object.normalize(activity)
+
+      data =
+        File.read!("test/fixtures/mastodon-vote.json")
+        |> Poison.decode!()
+        |> Kernel.put_in(["to"], user.ap_id)
+        |> Kernel.put_in(["object", "inReplyTo"], object.data["id"])
+        |> Kernel.put_in(["object", "to"], user.ap_id)
+
+      {:ok, %Activity{local: false}} = Transmogrifier.handle_incoming(data)
+
+      object = Object.get_by_ap_id(object.data["id"])
+
+      assert Enum.any?(
+               object.data["oneOf"],
+               fn
+                 %{"name" => "suya..", "replies" => %{"totalItems" => 1}} -> true
+                 _ -> false
+               end
+             )
+    end
+
     test "it works for incoming notices with contentMap" do
       data =
         File.read!("test/fixtures/mastodon-post-activity-contentmap.json") |> Poison.decode!()