Craft\ImportService::slugify PHP Method

    public function slugify($slug)
    {
        // Remove HTML tags
        $slug = preg_replace('/<(.*?)>/u', '', $slug);
        // Remove inner-word punctuation.
        $slug = preg_replace('/[\'"‘’“”\\[\\]\\(\\)\\{\\}:]/u', '', $slug);
        if (craft()->config->get('allowUppercaseInSlug') === false) {
            // Make it lowercase
            $slug = StringHelper::toLowerCase($slug);
        }
        // Get the "words".  Split on anything that is not a unicode letter or number. Periods, underscores, hyphens and forward slashes get a pass.
        preg_match_all('/[\\p{L}\\p{N}\\.\\/_-]+/u', $slug, $words);
        $words = ArrayHelper::filterEmptyStringsFromArray($words[0]);
        $slug = implode(craft()->config->get('slugWordSeparator'), $words);
        return $slug;
    }

 /**
  * @covers ::slugify
  */
 public function testSlugifyShouldSlugifyString()
 {
     $string = 'Test string';
     $slug = 'test-string';
     $mockConfigService = $this->getMock('Craft\\ConfigService');
     $mockConfigService->expects($this->any())->method('get')->willReturnCallback(function ($option) {
         if ($option == 'allowUppercaseInSlug') {
             return false;
         } elseif ($option == 'slugWordSeparator') {
             return '-';
         }
     });
     $this->setComponent(craft(), 'config', $mockConfigService);
     $service = new ImportService();
     $result = $service->slugify($string);
     $this->assertSame($slug, $result);
 }