MDL-47410 behat: Support selection from the datetime selector element

Adds behat support for selecting date and time from a datetime selector
element. The passed values should represent a textual date and time
description wrapped in '##' (e.g. '##first day of January 2020 08:00##',
'##1 Jan 2020 10:30##'). Also, the value 'disabled' is valid and can be
used to disable the datetime selector element.

lib/behat/form_field/behat_form_date_time.php

@@ -25,7 +25,7 @@
 
 // NOTE: no MOODLE_INTERNAL test here, this file may be required by behat before including /config.php.
 
-require_once(__DIR__  . '/behat_form_date_selector.php');
+require_once(__DIR__  . '/behat_form_date.php');
 
 /**
  * Date time form field.
@@ -38,5 +38,18 @@ require_once(__DIR__  . '/behat_form_date_selector.php');
  * @copyright  2013 David Monllaó
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class behat_form_date_time_selector extends behat_form_date_selector {
+class behat_form_date_time extends behat_form_date {
+
+    /**
+     * Returns the date field identifiers and the values that should be assigned to them.
+     *
+     * @param int $timestamp The UNIX timestamp
+     * @return array
+     */
+    protected function get_mapped_fields(int $timestamp): array {
+        return array_merge(parent::get_mapped_fields($timestamp), [
+            'hour' => date('G', $timestamp),
+            'minute' => (int) date('i', $timestamp)
+        ]);
+    }
 }

lib/form/templates/element-date_time_selector.mustache

@@ -1,6 +1,6 @@
 {{< core_form/element-group }}
     {{$element}}
-        <fieldset class="m-0 p-0 border-0" id="{{element.id}}">
+        <fieldset data-fieldtype="date_time" class="m-0 p-0 border-0" id="{{element.id}}">
             <legend class="sr-only">{{label}}</legend>
             <div class="fdate_time_selector d-flex flex-wrap align-items-center">
             {{#element.elements}}

lib/upgrade.txt

@@ -27,6 +27,9 @@ information provided here is intended especially for developers.
 * Behat now supports date selection from the date form element. Examples:
     - I set the field "<field_string>" to "##15 March 2021##"
     - I set the field "<field_string>" to "##first day of January last year##"
+* Behat now supports date and time selection from the datetime form element. Examples:
+    - I set the field "<field_string>" to "##15 March 2021 08:15##"
+    - I set the field "<field_string>" to "##first day of January last year noon##"
 
 === 3.10 ===
 * PHPUnit has been upgraded to 8.5. That comes with a few changes: