Add basic queue prioritization.

test/web/federator_test.exs

@@ -0,0 +1,20 @@
+defmodule Pleroma.Web.FederatorTest do
+  alias Pleroma.Web.Federator
+  use Pleroma.DataCase
+
+  test "enqueues an element according to priority" do
+    queue = [%{item: 1, priority: 2}]
+
+    new_queue = Federator.enqueue_sorted(queue, 2, 1)
+    assert new_queue == [%{item: 2, priority: 1}, %{item: 1, priority: 2}]
+
+    new_queue = Federator.enqueue_sorted(queue, 2, 3)
+    assert new_queue == [%{item: 1, priority: 2}, %{item: 2, priority: 3}]
+  end
+
+  test "pop first item" do
+    queue = [%{item: 2, priority: 1}, %{item: 1, priority: 2}]
+
+    assert {2, [%{item: 1, priority: 2}]} = Federator.queue_pop(queue)
+  end
+end