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diff --git a/lib/pleroma/gun/api/mock.ex b/lib/pleroma/gun/api/mock.ex
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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.Gun.API.Mock do
+  @behaviour Pleroma.Gun.API
+
+  alias Pleroma.Gun.API
+
+  @impl API
+  def open('some-domain.com', 443, _) do
+    {:ok, conn_pid} = Task.start_link(fn -> Process.sleep(1_000) end)
+
+    Registry.register(API.Mock, conn_pid, %{
+      origin_scheme: "https",
+      origin_host: 'some-domain.com',
+      origin_port: 443
+    })
+
+    {:ok, conn_pid}
+  end
+
+  @impl API
+  def open(ip, port, _)
+      when ip in [{10_755, 10_368, 61_708, 131, 64_206, 45_068, 0, 9_694}, {127, 0, 0, 1}] and
+             port in [80, 443] do
+    {:ok, conn_pid} = Task.start_link(fn -> Process.sleep(1_000) end)
+
+    scheme = if port == 443, do: "https", else: "http"
+
+    Registry.register(API.Mock, conn_pid, %{
+      origin_scheme: scheme,
+      origin_host: ip,
+      origin_port: port
+    })
+
+    {:ok, conn_pid}
+  end
+
+  @impl API
+  def open('localhost', 1234, %{
+        protocols: [:socks],
+        proxy: {:socks5, 'localhost', 1234},
+        socks_opts: %{host: 'proxy-socks.com', port: 80, version: 5}
+      }) do
+    {:ok, conn_pid} = Task.start_link(fn -> Process.sleep(1_000) end)
+
+    Registry.register(API.Mock, conn_pid, %{
+      origin_scheme: "http",
+      origin_host: 'proxy-socks.com',
+      origin_port: 80
+    })
+
+    {:ok, conn_pid}
+  end
+
+  @impl API
+  def open('localhost', 1234, %{
+        protocols: [:socks],
+        proxy: {:socks4, 'localhost', 1234},
+        socks_opts: %{
+          host: 'proxy-socks.com',
+          port: 443,
+          protocols: [:http2],
+          tls_opts: [],
+          transport: :tls,
+          version: 4
+        }
+      }) do
+    {:ok, conn_pid} = Task.start_link(fn -> Process.sleep(1_000) end)
+
+    Registry.register(API.Mock, conn_pid, %{
+      origin_scheme: "https",
+      origin_host: 'proxy-socks.com',
+      origin_port: 443
+    })
+
+    {:ok, conn_pid}
+  end
+
+  @impl API
+  def open('gun-not-up.com', 80, _opts), do: {:error, :timeout}
+
+  @impl API
+  def open('example.com', port, _) when port in [443, 115] do
+    {:ok, conn_pid} = Task.start_link(fn -> Process.sleep(1_000) end)
+
+    Registry.register(API.Mock, conn_pid, %{
+      origin_scheme: "https",
+      origin_host: 'example.com',
+      origin_port: 443
+    })
+
+    {:ok, conn_pid}
+  end
+
+  @impl API
+  def open(domain, 80, _) do
+    {:ok, conn_pid} = Task.start_link(fn -> Process.sleep(1_000) end)
+
+    Registry.register(API.Mock, conn_pid, %{
+      origin_scheme: "http",
+      origin_host: domain,
+      origin_port: 80
+    })
+
+    {:ok, conn_pid}
+  end
+
+  @impl API
+  def open({127, 0, 0, 1}, 8123, _) do
+    Task.start_link(fn -> Process.sleep(1_000) end)
+  end
+
+  @impl API
+  def open('localhost', 9050, _) do
+    Task.start_link(fn -> Process.sleep(1_000) end)
+  end
+
+  @impl API
+  def await_up(_pid), do: {:ok, :http}
+
+  @impl API
+  def connect(pid, %{host: _, port: 80}) do
+    ref = make_ref()
+    Registry.register(API.Mock, ref, pid)
+    ref
+  end
+
+  @impl API
+  def connect(pid, %{host: _, port: 443, protocols: [:http2], transport: :tls}) do
+    ref = make_ref()
+    Registry.register(API.Mock, ref, pid)
+    ref
+  end
+
+  @impl API
+  def await(pid, ref) do
+    [{_, ^pid}] = Registry.lookup(API.Mock, ref)
+    {:response, :fin, 200, []}
+  end
+
+  @impl API
+  def info(pid) do
+    [{_, info}] = Registry.lookup(API.Mock, pid)
+    info
+  end
+
+  @impl API
+  def close(_pid), do: :ok
+end