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diff --git a/test/pleroma/web/plugs/rate_limiter_test.exs b/test/pleroma/web/plugs/rate_limiter_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.RateLimiterTest do
+  use Pleroma.Web.ConnCase
+
+  alias Phoenix.ConnTest
+  alias Pleroma.Config
+  alias Pleroma.Web.Plugs.RateLimiter
+  alias Plug.Conn
+
+  import Pleroma.Factory
+  import Pleroma.Tests.Helpers, only: [clear_config: 1, clear_config: 2]
+
+  # Note: each example must work with separate buckets in order to prevent concurrency issues
+  setup do: clear_config([Pleroma.Web.Endpoint, :http, :ip])
+  setup do: clear_config(:rate_limit)
+
+  describe "config" do
+    @limiter_name :test_init
+    setup do: clear_config([Pleroma.Web.Plugs.RemoteIp, :enabled])
+
+    test "config is required for plug to work" do
+      Config.put([:rate_limit, @limiter_name], {1, 1})
+      Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+
+      assert %{limits: {1, 1}, name: :test_init, opts: [name: :test_init]} ==
+               [name: @limiter_name]
+               |> RateLimiter.init()
+               |> RateLimiter.action_settings()
+
+      assert nil ==
+               [name: :nonexisting_limiter]
+               |> RateLimiter.init()
+               |> RateLimiter.action_settings()
+    end
+  end
+
+  test "it is disabled if it remote ip plug is enabled but no remote ip is found" do
+    assert RateLimiter.disabled?(Conn.assign(build_conn(), :remote_ip_found, false))
+  end
+
+  test "it is enabled if remote ip found" do
+    refute RateLimiter.disabled?(Conn.assign(build_conn(), :remote_ip_found, true))
+  end
+
+  test "it is enabled if remote_ip_found flag doesn't exist" do
+    refute RateLimiter.disabled?(build_conn())
+  end
+
+  test "it restricts based on config values" do
+    limiter_name = :test_plug_opts
+    scale = 80
+    limit = 5
+
+    Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+    Config.put([:rate_limit, limiter_name], {scale, limit})
+
+    plug_opts = RateLimiter.init(name: limiter_name)
+    conn = build_conn(:get, "/")
+
+    for i <- 1..5 do
+      conn = RateLimiter.call(conn, plug_opts)
+      assert {^i, _} = RateLimiter.inspect_bucket(conn, limiter_name, plug_opts)
+      Process.sleep(10)
+    end
+
+    conn = RateLimiter.call(conn, plug_opts)
+    assert %{"error" => "Throttled"} = ConnTest.json_response(conn, :too_many_requests)
+    assert conn.halted
+
+    Process.sleep(50)
+
+    conn = build_conn(:get, "/")
+
+    conn = RateLimiter.call(conn, plug_opts)
+    assert {1, 4} = RateLimiter.inspect_bucket(conn, limiter_name, plug_opts)
+
+    refute conn.status == Conn.Status.code(:too_many_requests)
+    refute conn.resp_body
+    refute conn.halted
+  end
+
+  describe "options" do
+    test "`bucket_name` option overrides default bucket name" do
+      limiter_name = :test_bucket_name
+
+      Config.put([:rate_limit, limiter_name], {1000, 5})
+      Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+
+      base_bucket_name = "#{limiter_name}:group1"
+      plug_opts = RateLimiter.init(name: limiter_name, bucket_name: base_bucket_name)
+
+      conn = build_conn(:get, "/")
+
+      RateLimiter.call(conn, plug_opts)
+      assert {1, 4} = RateLimiter.inspect_bucket(conn, base_bucket_name, plug_opts)
+      assert {:error, :not_found} = RateLimiter.inspect_bucket(conn, limiter_name, plug_opts)
+    end
+
+    test "`params` option allows different queries to be tracked independently" do
+      limiter_name = :test_params
+      Config.put([:rate_limit, limiter_name], {1000, 5})
+      Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+
+      plug_opts = RateLimiter.init(name: limiter_name, params: ["id"])
+
+      conn = build_conn(:get, "/?id=1")
+      conn = Conn.fetch_query_params(conn)
+      conn_2 = build_conn(:get, "/?id=2")
+
+      RateLimiter.call(conn, plug_opts)
+      assert {1, 4} = RateLimiter.inspect_bucket(conn, limiter_name, plug_opts)
+      assert {0, 5} = RateLimiter.inspect_bucket(conn_2, limiter_name, plug_opts)
+    end
+
+    test "it supports combination of options modifying bucket name" do
+      limiter_name = :test_options_combo
+      Config.put([:rate_limit, limiter_name], {1000, 5})
+      Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+
+      base_bucket_name = "#{limiter_name}:group1"
+
+      plug_opts =
+        RateLimiter.init(name: limiter_name, bucket_name: base_bucket_name, params: ["id"])
+
+      id = "100"
+
+      conn = build_conn(:get, "/?id=#{id}")
+      conn = Conn.fetch_query_params(conn)
+      conn_2 = build_conn(:get, "/?id=#{101}")
+
+      RateLimiter.call(conn, plug_opts)
+      assert {1, 4} = RateLimiter.inspect_bucket(conn, base_bucket_name, plug_opts)
+      assert {0, 5} = RateLimiter.inspect_bucket(conn_2, base_bucket_name, plug_opts)
+    end
+  end
+
+  describe "unauthenticated users" do
+    test "are restricted based on remote IP" do
+      limiter_name = :test_unauthenticated
+      Config.put([:rate_limit, limiter_name], [{1000, 5}, {1, 10}])
+      Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+
+      plug_opts = RateLimiter.init(name: limiter_name)
+
+      conn = %{build_conn(:get, "/") | remote_ip: {127, 0, 0, 2}}
+      conn_2 = %{build_conn(:get, "/") | remote_ip: {127, 0, 0, 3}}
+
+      for i <- 1..5 do
+        conn = RateLimiter.call(conn, plug_opts)
+        assert {^i, _} = RateLimiter.inspect_bucket(conn, limiter_name, plug_opts)
+        refute conn.halted
+      end
+
+      conn = RateLimiter.call(conn, plug_opts)
+
+      assert %{"error" => "Throttled"} = ConnTest.json_response(conn, :too_many_requests)
+      assert conn.halted
+
+      conn_2 = RateLimiter.call(conn_2, plug_opts)
+      assert {1, 4} = RateLimiter.inspect_bucket(conn_2, limiter_name, plug_opts)
+
+      refute conn_2.status == Conn.Status.code(:too_many_requests)
+      refute conn_2.resp_body
+      refute conn_2.halted
+    end
+  end
+
+  describe "authenticated users" do
+    setup do
+      Ecto.Adapters.SQL.Sandbox.checkout(Pleroma.Repo)
+
+      :ok
+    end
+
+    test "can have limits separate from unauthenticated connections" do
+      limiter_name = :test_authenticated1
+
+      scale = 50
+      limit = 5
+      Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+      Config.put([:rate_limit, limiter_name], [{1000, 1}, {scale, limit}])
+
+      plug_opts = RateLimiter.init(name: limiter_name)
+
+      user = insert(:user)
+      conn = build_conn(:get, "/") |> assign(:user, user)
+
+      for i <- 1..5 do
+        conn = RateLimiter.call(conn, plug_opts)
+        assert {^i, _} = RateLimiter.inspect_bucket(conn, limiter_name, plug_opts)
+        refute conn.halted
+      end
+
+      conn = RateLimiter.call(conn, plug_opts)
+
+      assert %{"error" => "Throttled"} = ConnTest.json_response(conn, :too_many_requests)
+      assert conn.halted
+    end
+
+    test "different users are counted independently" do
+      limiter_name = :test_authenticated2
+      Config.put([:rate_limit, limiter_name], [{1, 10}, {1000, 5}])
+      Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+
+      plug_opts = RateLimiter.init(name: limiter_name)
+
+      user = insert(:user)
+      conn = build_conn(:get, "/") |> assign(:user, user)
+
+      user_2 = insert(:user)
+      conn_2 = build_conn(:get, "/") |> assign(:user, user_2)
+
+      for i <- 1..5 do
+        conn = RateLimiter.call(conn, plug_opts)
+        assert {^i, _} = RateLimiter.inspect_bucket(conn, limiter_name, plug_opts)
+      end
+
+      conn = RateLimiter.call(conn, plug_opts)
+      assert %{"error" => "Throttled"} = ConnTest.json_response(conn, :too_many_requests)
+      assert conn.halted
+
+      conn_2 = RateLimiter.call(conn_2, plug_opts)
+      assert {1, 4} = RateLimiter.inspect_bucket(conn_2, limiter_name, plug_opts)
+      refute conn_2.status == Conn.Status.code(:too_many_requests)
+      refute conn_2.resp_body
+      refute conn_2.halted
+    end
+  end
+
+  test "doesn't crash due to a race condition when multiple requests are made at the same time and the bucket is not yet initialized" do
+    limiter_name = :test_race_condition
+    Pleroma.Config.put([:rate_limit, limiter_name], {1000, 5})
+    Pleroma.Config.put([Pleroma.Web.Endpoint, :http, :ip], {8, 8, 8, 8})
+
+    opts = RateLimiter.init(name: limiter_name)
+
+    conn = build_conn(:get, "/")
+    conn_2 = build_conn(:get, "/")
+
+    %Task{pid: pid1} =
+      task1 =
+      Task.async(fn ->
+        receive do
+          :process2_up ->
+            RateLimiter.call(conn, opts)
+        end
+      end)
+
+    task2 =
+      Task.async(fn ->
+        send(pid1, :process2_up)
+        RateLimiter.call(conn_2, opts)
+      end)
+
+    Task.await(task1)
+    Task.await(task2)
+
+    refute {:err, :not_found} == RateLimiter.inspect_bucket(conn, limiter_name, opts)
+  end
+end