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diff --git a/test/pleroma/web/plugs/digest_plug_test.exs b/test/pleroma/web/plugs/digest_plug_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Plugs.DigestPlugTest do
+  use ExUnit.Case, async: true
+  use Plug.Test
+
+  test "digest algorithm is taken from digest header" do
+    body = "{\"hello\": \"world\"}"
+    digest = "X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE="
+
+    {:ok, ^body, conn} =
+      :get
+      |> conn("/", body)
+      |> put_req_header("content-type", "application/json")
+      |> put_req_header("digest", "sha-256=" <> digest)
+      |> Pleroma.Web.Plugs.DigestPlug.read_body([])
+
+    assert conn.assigns[:digest] == "sha-256=" <> digest
+
+    {:ok, ^body, conn} =
+      :get
+      |> conn("/", body)
+      |> put_req_header("content-type", "application/json")
+      |> put_req_header("digest", "SHA-256=" <> digest)
+      |> Pleroma.Web.Plugs.DigestPlug.read_body([])
+
+    assert conn.assigns[:digest] == "SHA-256=" <> digest
+  end
+
+  test "error if digest algorithm is invalid" do
+    body = "{\"hello\": \"world\"}"
+    digest = "X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE="
+
+    assert_raise ArgumentError, "invalid value for digest algorithm, got: MD5", fn ->
+      :get
+      |> conn("/", body)
+      |> put_req_header("content-type", "application/json")
+      |> put_req_header("digest", "MD5=" <> digest)
+      |> Pleroma.Web.Plugs.DigestPlug.read_body([])
+    end
+
+    assert_raise ArgumentError, "invalid value for digest algorithm, got: md5", fn ->
+      :get
+      |> conn("/", body)
+      |> put_req_header("content-type", "application/json")
+      |> put_req_header("digest", "md5=" <> digest)
+      |> Pleroma.Web.Plugs.DigestPlug.read_body([])
+    end
+  end
+end