Devise\Languages\LanguageDetector::primaryLanguageId PHP Method

    public function primaryLanguageId()
    {
        return $this->Config->get('devise.languages.primary_language_id');
    }

 public function test_it_can_give_me_primary_language_id()
 {
     $Config = m::mock('Illuminate\\Config\\Repository');
     $Config->shouldReceive('get')->times(1)->andReturn(45);
     $LanguageDetector = new LanguageDetector(new LocaleDetector($this->Framework), new \DvsLanguage(), $Config);
     assertEquals(45, $LanguageDetector->primaryLanguageId());
 }