federation_status: New endpoint showing unreachable instances

test/pleroma/web/pleroma_api/controllers/instances_controller_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.PleromaApi.InstancesControllerTest do
+  use Pleroma.Web.ConnCase
+
+  alias Pleroma.Instances
+
+  setup_all do: clear_config([:instance, :federation_reachability_timeout_days], 1)
+
+  setup do
+    constant = "http://consistently-unreachable.name/"
+    eventual = "http://eventually-unreachable.com/path"
+
+    {:ok, %Pleroma.Instances.Instance{unreachable_since: constant_unreachable}} =
+      Instances.set_consistently_unreachable(constant)
+
+    _eventual_unrechable = Instances.set_unreachable(eventual)
+
+    %{constant_unreachable: constant_unreachable, constant: constant}
+  end
+
+  test "GET /api/v1/pleroma/federation_status", %{
+    conn: conn,
+    constant_unreachable: constant_unreachable,
+    constant: constant
+  } do
+    constant_host = URI.parse(constant).host
+
+    assert conn
+           |> put_req_header("content-type", "application/json")
+           |> get("/api/v1/pleroma/federation_status")
+           |> json_response(200) == %{
+             "unreachable" => %{constant_host => to_string(constant_unreachable)}
+           }
+
+    # |> json_response_and_validate_schema(200)
+  end
+end