MDL-66378 behat: Add partial named selector for whole autocomplete field

lib/behat/classes/partial_named_selector.php

@@ -74,6 +74,7 @@ class behat_partial_named_selector extends \Behat\Mink\Selector\PartialNamedSele
         'table_row' => 'table_row',
         'xpath_element' => 'xpath_element',
         'form_row' => 'form_row',
+        'autocomplete' => 'autocomplete',
     );
 
     /**
@@ -111,6 +112,7 @@ class behat_partial_named_selector extends \Behat\Mink\Selector\PartialNamedSele
         'form_row' => 'form_row',
         'autocomplete_selection' => 'autocomplete_selection',
         'autocomplete_suggestions' => 'autocomplete_suggestions',
+        'autocomplete' => 'autocomplete',
     );
 
     /**
@@ -198,6 +200,9 @@ XPATH
 XPATH
         , 'autocomplete_suggestions' => <<<XPATH
 .//ul[contains(concat(' ', normalize-space(@class), ' '), concat(' ', 'form-autocomplete-suggestions', ' '))]/li[@role='option'][contains(normalize-space(.), %locator%)]
+XPATH
+        , 'autocomplete' => <<<XPATH
+.//descendant::input[@id = //label[contains(normalize-space(string(.)), %locator%)]/@for]/ancestor::*[@data-fieldtype = 'autocomplete']
 XPATH
     );