tests: streamer: add a test for blocked transitive activities

test/web/streamer/streamer_test.exs

@@ -233,7 +233,8 @@ test "it sends message if recipients invalid and thread containment is enabled b
     end
   end
 
-  test "it doesn't send to blocked users" do
+  describe "blocks" do
+    test "it doesn't send messages involving blocked users" do
       user = insert(:user)
       blocked_user = insert(:user)
       {:ok, user} = User.block(user, blocked_user)
@@ -259,6 +260,43 @@ test "it doesn't send to blocked users" do
       Task.await(task)
     end
 
+    test "it doesn't send messages transitively involving blocked users" do
+      blocker = insert(:user)
+      blockee = insert(:user)
+      friend = insert(:user)
+
+      task =
+        Task.async(fn ->
+          refute_receive {:text, _}, 1_000
+        end)
+
+      fake_socket = %StreamerSocket{
+        transport_pid: task.pid,
+        user: blocker
+      }
+
+      topics = %{
+        "public" => [fake_socket]
+      }
+
+      {:ok, blocker} = User.block(blocker, blockee)
+
+      {:ok, activity_one} = CommonAPI.post(friend, %{"status" => "hey! @#{blockee.nickname}"})
+
+      Worker.push_to_socket(topics, "public", activity_one)
+
+      {:ok, activity_two} = CommonAPI.post(blockee, %{"status" => "hey! @#{friend.nickname}"})
+
+      Worker.push_to_socket(topics, "public", activity_two)
+
+      {:ok, activity_three} = CommonAPI.post(blockee, %{"status" => "hey! @#{blocker.nickname}"})
+
+      Worker.push_to_socket(topics, "public", activity_three)
+
+      Task.await(task)
+    end
+  end
+
   test "it doesn't send unwanted DMs to list" do
     user_a = insert(:user)
     user_b = insert(:user)