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diff --git a/test/pleroma/web/plugs/user_tracking_plug_test.exs b/test/pleroma/web/plugs/user_tracking_plug_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Plugs.UserTrackingPlugTest do
+  use Pleroma.Web.ConnCase, async: true
+
+  import Pleroma.Factory
+
+  alias Pleroma.Web.Plugs.UserTrackingPlug
+
+  test "updates last_active_at for a new user", %{conn: conn} do
+    user = insert(:user)
+
+    assert is_nil(user.last_active_at)
+
+    test_started_at = NaiveDateTime.utc_now() |> NaiveDateTime.truncate(:second)
+
+    %{assigns: %{user: user}} =
+      conn
+      |> assign(:user, user)
+      |> UserTrackingPlug.call(%{})
+
+    assert user.last_active_at >= test_started_at
+    assert user.last_active_at <= NaiveDateTime.truncate(NaiveDateTime.utc_now(), :second)
+  end
+
+  test "doesn't update last_active_at if it was updated recently", %{conn: conn} do
+    last_active_at =
+      NaiveDateTime.utc_now()
+      |> NaiveDateTime.add(-:timer.hours(1), :millisecond)
+      |> NaiveDateTime.truncate(:second)
+
+    user = insert(:user, %{last_active_at: last_active_at})
+
+    %{assigns: %{user: user}} =
+      conn
+      |> assign(:user, user)
+      |> UserTrackingPlug.call(%{})
+
+    assert user.last_active_at == last_active_at
+  end
+
+  test "skips updating last_active_at if user ID is nil", %{conn: conn} do
+    %{assigns: %{user: user}} =
+      conn
+      |> assign(:user, %Pleroma.User{})
+      |> UserTrackingPlug.call(%{})
+
+    assert is_nil(user.last_active_at)
+  end
+
+  test "does nothing if user is not present", %{conn: conn} do
+    %{assigns: assigns} = UserTrackingPlug.call(conn, %{})
+
+    refute Map.has_key?(assigns, :user)
+  end
+end