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diff --git a/test/plugs/idempotency_plug_test.exs b/test/plugs/idempotency_plug_test.exs
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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.Plugs.IdempotencyPlugTest do
+  use ExUnit.Case, async: true
+  use Plug.Test
+
+  alias Pleroma.Plugs.IdempotencyPlug
+  alias Plug.Conn
+
+  test "returns result from cache" do
+    key = "test1"
+    orig_request_id = "test1"
+    second_request_id = "test2"
+    body = "testing"
+    status = 200
+
+    :post
+    |> conn("/cofe")
+    |> put_req_header("idempotency-key", key)
+    |> Conn.put_resp_header("x-request-id", orig_request_id)
+    |> Conn.put_resp_content_type("application/json")
+    |> IdempotencyPlug.call([])
+    |> Conn.send_resp(status, body)
+
+    conn =
+      :post
+      |> conn("/cofe")
+      |> put_req_header("idempotency-key", key)
+      |> Conn.put_resp_header("x-request-id", second_request_id)
+      |> Conn.put_resp_content_type("application/json")
+      |> IdempotencyPlug.call([])
+
+    assert_raise Conn.AlreadySentError, fn ->
+      Conn.send_resp(conn, :im_a_teapot, "no cofe")
+    end
+
+    assert conn.resp_body == body
+    assert conn.status == status
+
+    assert [^second_request_id] = Conn.get_resp_header(conn, "x-request-id")
+    assert [^orig_request_id] = Conn.get_resp_header(conn, "x-original-request-id")
+    assert [^key] = Conn.get_resp_header(conn, "idempotency-key")
+    assert ["true"] = Conn.get_resp_header(conn, "idempotent-replayed")
+    assert ["application/json; charset=utf-8"] = Conn.get_resp_header(conn, "content-type")
+  end
+
+  test "pass conn downstream if the cache not found" do
+    key = "test2"
+    orig_request_id = "test3"
+    body = "testing"
+    status = 200
+
+    conn =
+      :post
+      |> conn("/cofe")
+      |> put_req_header("idempotency-key", key)
+      |> Conn.put_resp_header("x-request-id", orig_request_id)
+      |> Conn.put_resp_content_type("application/json")
+      |> IdempotencyPlug.call([])
+      |> Conn.send_resp(status, body)
+
+    assert conn.resp_body == body
+    assert conn.status == status
+
+    assert [] = Conn.get_resp_header(conn, "idempotent-replayed")
+    assert [^key] = Conn.get_resp_header(conn, "idempotency-key")
+  end
+
+  test "passes conn downstream if idempotency is not present in headers" do
+    orig_request_id = "test4"
+    body = "testing"
+    status = 200
+
+    conn =
+      :post
+      |> conn("/cofe")
+      |> Conn.put_resp_header("x-request-id", orig_request_id)
+      |> Conn.put_resp_content_type("application/json")
+      |> IdempotencyPlug.call([])
+      |> Conn.send_resp(status, body)
+
+    assert [] = Conn.get_resp_header(conn, "idempotency-key")
+  end
+
+  test "doesn't work with GET/DELETE" do
+    key = "test3"
+    body = "testing"
+    status = 200
+
+    conn =
+      :get
+      |> conn("/cofe")
+      |> put_req_header("idempotency-key", key)
+      |> IdempotencyPlug.call([])
+      |> Conn.send_resp(status, body)
+
+    assert [] = Conn.get_resp_header(conn, "idempotency-key")
+
+    conn =
+      :delete
+      |> conn("/cofe")
+      |> put_req_header("idempotency-key", key)
+      |> IdempotencyPlug.call([])
+      |> Conn.send_resp(status, body)
+
+    assert [] = Conn.get_resp_header(conn, "idempotency-key")
+  end
+end