adds test coverage for back-to-top button.

tests/behat/behat_theme_ucsf_backtotop.feature

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+@theme @theme_ucsf @theme_ucsf_backtotop
+Feature:
+  Background:
+    Given the following "users" exist:
+      | username |
+      | student1 |
+    And the following "courses" exist:
+      | fullname | shortname |
+      | Course 1 | C1        |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | student1 | C1     | student        |
+
+  @javascript
+  Scenario: Back to top button - is visible and works
+    Given the theme cache is purged and the theme is reloaded
+    When I log in as "student1"
+    And I am on "Course 1" course homepage
+    Then "#back-to-top" "css_element" should exist
+    And "#page-footer" "css_element" should appear before "#back-to-top" "css_element"
+    And "#back-to-top" "css_element" should not be visible
+    And I scroll page to x "0" y "250"
+    And "#back-to-top" "css_element" should be visible
+    And I click on "#back-to-top" "css_element"
+    # Then I wait 1 second as the scroll up process is animated
+    And I wait "1" seconds
+    And "#back-to-top" "css_element" should not be visible

tests/behat/behat_theme_ucsf_base_general.php

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+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Theme UCSF - General custom Behat rules
+ *
+ * @package theme_ucsf
+ * @copyright The Regents of the University of California
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require_once(__DIR__.'/../../../../lib/behat/behat_base.php');
+
+
+/**
+ * Class behat_theme_ucsf_base_general
+ *
+ * @package theme_ucsf
+ * @copyright The Regents of the University of California
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class behat_theme_ucsf_base_general extends behat_base {
+
+    /**
+     * Resets the theme cache.
+     * @Given /^the theme cache has been reset$/
+     */
+    public function theme_reset_all_caches() {
+        theme_reset_all_caches();
+    }
+
+    /**
+     * Purges theme cache and reloads the theme
+     * @copyright  2022 Alexander Bias, lern.link GmbH <[email protected]>
+     * @see https://github.com/moodle-an-hochschulen/moodle-theme_boost_union
+     * @Given /^the theme cache is purged and the theme is reloaded$/
+     */
+    public function purge_theme_cache_and_reload_theme() {
+        theme_reset_all_caches();
+    }
+
+    /**
+     * Scroll the page to a given coordinate.
+     *
+     * @copyright 2016 Shweta Sharma on https://stackoverflow.com/a/39613869.
+     * @Then /^I scroll page to x "(?P<posx_number>\d+)" y "(?P<posy_number>\d+)"$/
+     * @param string $posx The x coordinate to scroll to.
+     * @param string $posy The y coordinate to scroll to.
+     * @return void
+     * @throws Exception
+     */
+    public function i_scroll_page_to_x_y_coordinates_of_page($posx, $posy) {
+        try {
+            $this->getSession()->executeScript("(function(){window.scrollTo($posx, $posy);})();");
+        } catch (Exception) {
+            throw new Exception("Scrolling the page to given coordinates failed");
+        }
+    }
+}