tests consistency

test/support/captcha/mock.ex

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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.Captcha.Mock do
+  alias Pleroma.Captcha.Service
+  @behaviour Service
+
+  @solution "63615261b77f5354fb8c4e4986477555"
+
+  def solution, do: @solution
+
+  @impl Service
+  def new,
+    do: %{
+      type: :mock,
+      token: "afa1815e14e29355e6c8f6b143a39fa2",
+      answer_data: @solution,
+      url: "https://example.org/captcha.png",
+      seconds_valid: 300
+    }
+
+  @impl Service
+  def validate(_token, captcha, captcha) when not is_nil(captcha), do: :ok
+
+  def validate(_token, captcha, answer),
+    do: {:error, "Invalid CAPTCHA captcha: #{inspect(captcha)} ; answer: #{inspect(answer)}"}
+end