Add test

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

lib/pleroma/language/language_detector.ex

@@ -11,7 +11,7 @@ defmodule Pleroma.Language.LanguageDetector do
     if provider do
       provider.missing_dependencies()
     else
-      nil
+      []
     end
   end
 
@@ -28,7 +28,7 @@ defmodule Pleroma.Language.LanguageDetector do
     end
   end
 
-  defp get_provider() do
+  defp get_provider do
     Pleroma.Config.get([__MODULE__, :provider])
   end
 end

test/pleroma/language/language_detector_test.ex

@@ -0,0 +1,31 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Language.LanguageDetectorTest do
+  use Pleroma.Web.ConnCase
+
+  alias Pleroma.Language.LanguageDetector
+
+  setup do: clear_config([Pleroma.Language.LanguageDetector, :provider], LanguageDetectorMock)
+
+  test "it detects text language" do
+    detected_language = LanguageDetector.detect("Je viens d'atterrir en Tchéquie.")
+
+    assert detected_language == "fr"
+  end
+
+  test "it returns nil if text is not long enough" do
+    detected_language = LanguageDetector.detect("it returns nil")
+
+    assert detected_language == nil
+  end
+
+  test "it returns nil if no provider specified" do
+    clear_config([Pleroma.Language.LanguageDetector, :provider], nil)
+
+    detected_language = LanguageDetector.detect("this should also return nil")
+
+    assert detected_language == nil
+  end
+end

test/support/language_detector_mock.ex

@@ -0,0 +1,18 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule LanguageDetectorMock do
+  alias Pleroma.Language.LanguageDetector.Provider
+
+  @behaviour Provider
+
+  @impl Provider
+  def missing_dependencies, do: []
+
+  @impl Provider
+  def configured?, do: true
+
+  @impl Provider
+  def detect(text), do: "fr"
+end