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diff --git a/test/pleroma/http/adapter_helper/gun_test.exs b/test/pleroma/http/adapter_helper/gun_test.exs
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+++ b/test/pleroma/http/adapter_helper/gun_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.HTTP.AdapterHelper.GunTest do
+  use ExUnit.Case
+  use Pleroma.Tests.Helpers
+
+  import Mox
+
+  alias Pleroma.HTTP.AdapterHelper.Gun
+
+  setup :verify_on_exit!
+
+  describe "options/1" do
+    setup do: clear_config([:http, :adapter], a: 1, b: 2)
+
+    test "https url with default port" do
+      uri = URI.parse("https://example.com")
+
+      opts = Gun.options([receive_conn: false], uri)
+      assert opts[:certificates_verification]
+    end
+
+    test "https ipv4 with default port" do
+      uri = URI.parse("https://127.0.0.1")
+
+      opts = Gun.options([receive_conn: false], uri)
+      assert opts[:certificates_verification]
+    end
+
+    test "https ipv6 with default port" do
+      uri = URI.parse("https://[2a03:2880:f10c:83:face:b00c:0:25de]")
+
+      opts = Gun.options([receive_conn: false], uri)
+      assert opts[:certificates_verification]
+    end
+
+    test "https url with non standart port" do
+      uri = URI.parse("https://example.com:115")
+
+      opts = Gun.options([receive_conn: false], uri)
+
+      assert opts[:certificates_verification]
+    end
+
+    test "merges with defaul http adapter config" do
+      defaults = Gun.options([receive_conn: false], URI.parse("https://example.com"))
+      assert Keyword.has_key?(defaults, :a)
+      assert Keyword.has_key?(defaults, :b)
+    end
+
+    test "parses string proxy host & port" do
+      clear_config([:http, :proxy_url], "localhost:8123")
+
+      uri = URI.parse("https://some-domain.com")
+      opts = Gun.options([receive_conn: false], uri)
+      assert opts[:proxy] == {'localhost', 8123}
+    end
+
+    test "parses tuple proxy scheme host and port" do
+      clear_config([:http, :proxy_url], {:socks, 'localhost', 1234})
+
+      uri = URI.parse("https://some-domain.com")
+      opts = Gun.options([receive_conn: false], uri)
+      assert opts[:proxy] == {:socks, 'localhost', 1234}
+    end
+
+    test "passed opts have more weight than defaults" do
+      clear_config([:http, :proxy_url], {:socks5, 'localhost', 1234})
+      uri = URI.parse("https://some-domain.com")
+      opts = Gun.options([receive_conn: false, proxy: {'example.com', 4321}], uri)
+
+      assert opts[:proxy] == {'example.com', 4321}
+    end
+  end
+end