Fix filterable_languages method of SettingsHelper (#4966)

spec/lib/language_detector_spec.rb

@@ -3,10 +3,10 @@
 require 'rails_helper'
 
 describe LanguageDetector do
-  describe 'prepared_text' do
+  describe 'prepare_text' do
     it 'returns unmodified string without special cases' do
       string = 'just a regular string'
-      result = described_class.new(string).prepared_text
+      result = described_class.instance.send(:prepare_text, string)
 
       expect(result).to eq string
     end
@@ -14,33 +14,35 @@ describe LanguageDetector do
     it 'collapses spacing in strings' do
       string = 'The formatting   in    this is very        odd'
 
-      result = described_class.new(string).prepared_text
+      result = described_class.instance.send(:prepare_text, string)
       expect(result).to eq 'The formatting in this is very odd'
     end
 
     it 'strips usernames from strings before detection' do
       string = '@username Yeah, very surreal...! also @friend'
 
-      result = described_class.new(string).prepared_text
+      result = described_class.instance.send(:prepare_text, string)
       expect(result).to eq 'Yeah, very surreal...! also'
     end
 
     it 'strips URLs from strings before detection' do
       string = 'Our website is https://example.com and also http://localhost.dev'
 
-      result = described_class.new(string).prepared_text
+      result = described_class.instance.send(:prepare_text, string)
       expect(result).to eq 'Our website is and also'
     end
 
     it 'strips #hashtags from strings before detection' do
       string = 'Hey look at all the #animals and #fish'
 
-      result = described_class.new(string).prepared_text
+      result = described_class.instance.send(:prepare_text, string)
       expect(result).to eq 'Hey look at all the and'
     end
   end
 
-  describe 'to_iso_s' do
+  describe 'detect' do
+    let(:account_without_user_locale) { Fabricate(:user, locale: nil).account }
+
     it 'detects english language for basic strings' do
       strings = [
         "Hello and welcome to mastodon how are you today?",
@@ -48,7 +50,7 @@ describe LanguageDetector do
         "a lot of people just want to feel righteous all the time and that's all that matters",
       ]
       strings.each do |string|
-        result = described_class.new(string).to_iso_s
+        result = described_class.instance.detect(string, account_without_user_locale)
 
         expect(result).to eq(:en), string
       end
@@ -56,14 +58,14 @@ describe LanguageDetector do
 
     it 'detects spanish language' do
       string = 'Obtener un Hola y bienvenidos a Mastodon'
-      result = described_class.new(string).to_iso_s
+      result = described_class.instance.detect(string, account_without_user_locale)
 
       expect(result).to eq :es
     end
 
     describe 'when language can\'t be detected' do
       it 'uses nil when sent an empty document' do
-        result = described_class.new('').to_iso_s
+        result = described_class.instance.detect('', account_without_user_locale)
         expect(result).to eq nil
       end
 
@@ -73,7 +75,7 @@ describe LanguageDetector do
           cld_result = CLD3::NNetLanguageIdentifier.new(0, 2048).find_language(string)
           expect(cld_result).not_to eq :en
 
-          result = described_class.new(string).to_iso_s
+          result = described_class.instance.detect(string, account_without_user_locale)
 
           expect(result).to eq nil
         end
@@ -82,14 +84,13 @@ describe LanguageDetector do
       describe 'with an account' do
         it 'uses the account locale when present' do
           account = double(user_locale: 'fr')
-          result  = described_class.new('', account).to_iso_s
+          result  = described_class.instance.detect('', account)
 
           expect(result).to eq :fr
         end
 
         it 'uses nil when account is present but has no locale' do
-          account = double(user_locale: nil)
-          result  = described_class.new('', account).to_iso_s
+          result  = described_class.instance.detect('', account_without_user_locale)
 
           expect(result).to eq nil
         end
@@ -97,8 +98,7 @@ describe LanguageDetector do
 
       describe 'with an `en` default locale' do
         it 'uses nil for undetectable string' do
-          string = ''
-          result = described_class.new(string).to_iso_s
+          result = described_class.instance.detect('', account_without_user_locale)
 
           expect(result).to eq nil
         end
@@ -114,7 +114,7 @@ describe LanguageDetector do
 
         it 'uses nil for undetectable string' do
           string = ''
-          result = described_class.new(string).to_iso_s
+          result = described_class.instance.detect(string, account_without_user_locale)
 
           expect(result).to eq nil
         end