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diff --git a/test/pleroma/web/plugs/http_signature_plug_test.exs b/test/pleroma/web/plugs/http_signature_plug_test.exs
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+++ b/test/pleroma/web/plugs/http_signature_plug_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.Plugs.HTTPSignaturePlugTest do
+  use Pleroma.Web.ConnCase
+  alias Pleroma.Web.Plugs.HTTPSignaturePlug
+
+  import Plug.Conn
+  import Phoenix.Controller, only: [put_format: 2]
+  import Mock
+
+  test "it call HTTPSignatures to check validity if the actor sighed it" do
+    params = %{"actor" => "http://mastodon.example.org/users/admin"}
+    conn = build_conn(:get, "/doesntmattter", params)
+
+    with_mock HTTPSignatures, validate_conn: fn _ -> true end do
+      conn =
+        conn
+        |> put_req_header(
+          "signature",
+          "keyId=\"http://mastodon.example.org/users/admin#main-key"
+        )
+        |> put_format("activity+json")
+        |> HTTPSignaturePlug.call(%{})
+
+      assert conn.assigns.valid_signature == true
+      assert conn.halted == false
+      assert called(HTTPSignatures.validate_conn(:_))
+    end
+  end
+
+  describe "requires a signature when `authorized_fetch_mode` is enabled" do
+    setup do
+      Pleroma.Config.put([:activitypub, :authorized_fetch_mode], true)
+
+      on_exit(fn ->
+        Pleroma.Config.put([:activitypub, :authorized_fetch_mode], false)
+      end)
+
+      params = %{"actor" => "http://mastodon.example.org/users/admin"}
+      conn = build_conn(:get, "/doesntmattter", params) |> put_format("activity+json")
+
+      [conn: conn]
+    end
+
+    test "when signature header is present", %{conn: conn} do
+      with_mock HTTPSignatures, validate_conn: fn _ -> false end do
+        conn =
+          conn
+          |> put_req_header(
+            "signature",
+            "keyId=\"http://mastodon.example.org/users/admin#main-key"
+          )
+          |> HTTPSignaturePlug.call(%{})
+
+        assert conn.assigns.valid_signature == false
+        assert conn.halted == true
+        assert conn.status == 401
+        assert conn.state == :sent
+        assert conn.resp_body == "Request not signed"
+        assert called(HTTPSignatures.validate_conn(:_))
+      end
+
+      with_mock HTTPSignatures, validate_conn: fn _ -> true end do
+        conn =
+          conn
+          |> put_req_header(
+            "signature",
+            "keyId=\"http://mastodon.example.org/users/admin#main-key"
+          )
+          |> HTTPSignaturePlug.call(%{})
+
+        assert conn.assigns.valid_signature == true
+        assert conn.halted == false
+        assert called(HTTPSignatures.validate_conn(:_))
+      end
+    end
+
+    test "halts the connection when `signature` header is not present", %{conn: conn} do
+      conn = HTTPSignaturePlug.call(conn, %{})
+      assert conn.assigns[:valid_signature] == nil
+      assert conn.halted == true
+      assert conn.status == 401
+      assert conn.state == :sent
+      assert conn.resp_body == "Request not signed"
+    end
+  end
+end