Admin API: GET /api/pleroma/admin/stats to get status count by visibility scope

test/tasks/refresh_counter_cache_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Mix.Tasks.Pleroma.RefreshCounterCacheTest do
+  use Pleroma.DataCase
+  alias Pleroma.Web.CommonAPI
+  import ExUnit.CaptureIO, only: [capture_io: 1]
+  import Pleroma.Factory
+
+  test "counts statuses" do
+    user = insert(:user)
+    other_user = insert(:user)
+
+    CommonAPI.post(user, %{"visibility" => "public", "status" => "hey"})
+
+    Enum.each(0..1, fn _ ->
+      CommonAPI.post(user, %{
+        "visibility" => "unlisted",
+        "status" => "hey"
+      })
+    end)
+
+    Enum.each(0..2, fn _ ->
+      CommonAPI.post(user, %{
+        "visibility" => "direct",
+        "status" => "hey @#{other_user.nickname}"
+      })
+    end)
+
+    Enum.each(0..3, fn _ ->
+      CommonAPI.post(user, %{
+        "visibility" => "private",
+        "status" => "hey"
+      })
+    end)
+
+    assert capture_io(fn -> Mix.Tasks.Pleroma.RefreshCounterCache.run([]) end) =~ "Done\n"
+
+    assert %{direct: 3, private: 4, public: 1, unlisted: 2} =
+             Pleroma.Stats.get_status_visibility_count()
+  end
+end