Return total from pagination + tests

test/pagination_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 Pleroma.PaginationTest do
+  use Pleroma.DataCase
+
+  import Pleroma.Factory
+
+  alias Pleroma.Object
+  alias Pleroma.Pagination
+
+  describe "keyset" do
+    setup do
+      notes = insert_list(5, :note)
+
+      %{notes: notes}
+    end
+
+    test "paginates by min_id", %{notes: notes} do
+      id = Enum.at(notes, 2).id |> Integer.to_string()
+      %{total: total, items: paginated} = Pagination.fetch_paginated(Object, %{"min_id" => id})
+
+      assert length(paginated) == 2
+      assert total == 5
+    end
+
+    test "paginates by since_id", %{notes: notes} do
+      id = Enum.at(notes, 2).id |> Integer.to_string()
+      %{total: total, items: paginated} = Pagination.fetch_paginated(Object, %{"since_id" => id})
+
+      assert length(paginated) == 2
+      assert total == 5
+    end
+
+    test "paginates by max_id", %{notes: notes} do
+      id = Enum.at(notes, 1).id |> Integer.to_string()
+      %{total: total, items: paginated} = Pagination.fetch_paginated(Object, %{"max_id" => id})
+
+      assert length(paginated) == 1
+      assert total == 5
+    end
+
+    test "paginates by min_id & limit", %{notes: notes} do
+      id = Enum.at(notes, 2).id |> Integer.to_string()
+
+      %{total: total, items: paginated} =
+        Pagination.fetch_paginated(Object, %{"min_id" => id, "limit" => 1})
+
+      assert length(paginated) == 1
+      assert total == 5
+    end
+  end
+
+  describe "offset" do
+    setup do
+      notes = insert_list(5, :note)
+
+      %{notes: notes}
+    end
+
+    test "paginates by limit" do
+      %{total: total, items: paginated} =
+        Pagination.fetch_paginated(Object, %{"limit" => 2}, :offset)
+
+      assert length(paginated) == 2
+      assert total == 5
+    end
+
+    test "paginates by limit & offset" do
+      %{total: total, items: paginated} =
+        Pagination.fetch_paginated(Object, %{"limit" => 2, "offset" => 4}, :offset)
+
+      assert length(paginated) == 1
+      assert total == 5
+    end
+  end
+end