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diff --git a/test/http/connection_test.exs b/test/http/connection_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.HTTP.ConnectionTest do
+  use ExUnit.Case
+  use Pleroma.Tests.Helpers
+
+  import ExUnit.CaptureLog
+
+  alias Pleroma.Config
+  alias Pleroma.HTTP.Connection
+
+  describe "parse_host/1" do
+    test "as atom to charlist" do
+      assert Connection.parse_host(:localhost) == 'localhost'
+    end
+
+    test "as string to charlist" do
+      assert Connection.parse_host("localhost.com") == 'localhost.com'
+    end
+
+    test "as string ip to tuple" do
+      assert Connection.parse_host("127.0.0.1") == {127, 0, 0, 1}
+    end
+  end
+
+  describe "parse_proxy/1" do
+    test "ip with port" do
+      assert Connection.parse_proxy("127.0.0.1:8123") == {:ok, {127, 0, 0, 1}, 8123}
+    end
+
+    test "host with port" do
+      assert Connection.parse_proxy("localhost:8123") == {:ok, 'localhost', 8123}
+    end
+
+    test "as tuple" do
+      assert Connection.parse_proxy({:socks4, :localhost, 9050}) ==
+               {:ok, :socks4, 'localhost', 9050}
+    end
+
+    test "as tuple with string host" do
+      assert Connection.parse_proxy({:socks5, "localhost", 9050}) ==
+               {:ok, :socks5, 'localhost', 9050}
+    end
+  end
+
+  describe "parse_proxy/1 errors" do
+    test "ip without port" do
+      capture_log(fn ->
+        assert Connection.parse_proxy("127.0.0.1") == {:error, :invalid_proxy}
+      end) =~ "parsing proxy fail \"127.0.0.1\""
+    end
+
+    test "host without port" do
+      capture_log(fn ->
+        assert Connection.parse_proxy("localhost") == {:error, :invalid_proxy}
+      end) =~ "parsing proxy fail \"localhost\""
+    end
+
+    test "host with bad port" do
+      capture_log(fn ->
+        assert Connection.parse_proxy("localhost:port") == {:error, :invalid_proxy_port}
+      end) =~ "parsing port in proxy fail \"localhost:port\""
+    end
+
+    test "ip with bad port" do
+      capture_log(fn ->
+        assert Connection.parse_proxy("127.0.0.1:15.9") == {:error, :invalid_proxy_port}
+      end) =~ "parsing port in proxy fail \"127.0.0.1:15.9\""
+    end
+
+    test "as tuple without port" do
+      capture_log(fn ->
+        assert Connection.parse_proxy({:socks5, :localhost}) == {:error, :invalid_proxy}
+      end) =~ "parsing proxy fail {:socks5, :localhost}"
+    end
+
+    test "with nil" do
+      assert Connection.parse_proxy(nil) == nil
+    end
+  end
+
+  describe "options/3" do
+    setup do: clear_config([:http, :proxy_url])
+
+    test "without proxy_url in config" do
+      Config.delete([:http, :proxy_url])
+
+      opts = Connection.options(%URI{})
+      refute Keyword.has_key?(opts, :proxy)
+    end
+
+    test "parses string proxy host & port" do
+      Config.put([:http, :proxy_url], "localhost:8123")
+
+      opts = Connection.options(%URI{})
+      assert opts[:proxy] == {'localhost', 8123}
+    end
+
+    test "parses tuple proxy scheme host and port" do
+      Config.put([:http, :proxy_url], {:socks, 'localhost', 1234})
+
+      opts = Connection.options(%URI{})
+      assert opts[:proxy] == {:socks, 'localhost', 1234}
+    end
+
+    test "passed opts have more weight than defaults" do
+      Config.put([:http, :proxy_url], {:socks5, 'localhost', 1234})
+
+      opts = Connection.options(%URI{}, proxy: {'example.com', 4321})
+
+      assert opts[:proxy] == {'example.com', 4321}
+    end
+  end
+
+  describe "format_host/1" do
+    test "with domain" do
+      assert Connection.format_host("example.com") == 'example.com'
+    end
+
+    test "with idna domain" do
+      assert Connection.format_host("ですexample.com") == 'xn--example-183fne.com'
+    end
+
+    test "with ipv4" do
+      assert Connection.format_host("127.0.0.1") == '127.0.0.1'
+    end
+
+    test "with ipv6" do
+      assert Connection.format_host("2a03:2880:f10c:83:face:b00c:0:25de") ==
+               '2a03:2880:f10c:83:face:b00c:0:25de'
+    end
+  end
+end