MDL-62944 completion: Test that completion dates add events to calendar

When a user does not have calendar capabilities completion dates should
still be created correctly.

completion/tests/behat/completion_no_calendar_capabilities.feature

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+@core @core_completion
+Feature: Completion with no calendar capabilites
+  In order to allow work effectively
+  As a teacher
+  I need to be able to create activities with completion enabled without calendar capabilities
+
+  Background:
+    Given the following "courses" exist:
+      | fullname | shortname | category | groupmode | enablecompletion |
+      | Course 1 | C1 | 0 | 1 | 1 |
+    And the following "users" exist:
+      | username | firstname | lastname | email |
+      | teacher1 | Teacher | 1 | teacher1@example.com |
+    And the following "course enrolments" exist:
+      | user | course | role |
+      | teacher1 | C1 | editingteacher |
+    And I log in as "admin"
+    And I am on "Course 1" course homepage
+    And I navigate to "Users > Permissions" in current page administration
+    And I override the system permissions of "Teacher" role with:
+      | capability | permission |
+      | moodle/calendar:manageentries | Prohibit |
+    And I log out
+
+  Scenario: Editing completion date
+    Given I log in as "admin"
+    And I am on "Course 1" course homepage with editing mode on
+    When I add a "Forum" to section "1" and I fill the form with:
+      | Forum name | Test forum name |
+      | Description | Test forum description |
+      | Completion tracking | Show activity as complete when conditions are met |
+      | id_completionexpected_enabled | 1 |
+      | id_completionexpected_day | 1 |
+      | id_completionexpected_month | 1 |
+      | id_completionexpected_year | 2017 |
+    And I log out
+    When I log in as "teacher1"
+    And I am on "Course 1" course homepage with editing mode on
+    And I follow "Test forum name"
+    And I navigate to "Edit settings" in current page administration
+    And I set the following fields to these values:
+      | id_completionexpected_year | 2018 |
+    And I press "Save and return to course"
+    Then I should see "Test forum name"

completion/tests/capabilities_test.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/>.
+
+/**
+ * Tests that completion works without requiring unnecessary capabilities.
+ *
+ * @package    core_completion
+ * @copyright  2018 University of Nottingham
+ * @author     Neill Magill <neill.magill@nottingham.ac.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Tests that completion works without requiring unnecessary capabilities.
+ *
+ * @package    core_completion
+ * @copyright  2018 University of Nottingham
+ * @author     Neill Magill <neill.magill@nottingham.ac.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class core_completion_capabilities_testcase extends advanced_testcase {
+    /**
+     * A user who does not have capabilities to add events to the calendar should be able to create activities.
+     */
+    public function test_creation_with_no_calendar_capabilities() {
+        $this->resetAfterTest();
+        $course = self::getDataGenerator()->create_course(['enablecompletion' => 1]);
+        $context = context_course::instance($course->id);
+        $user = self::getDataGenerator()->create_and_enrol($course, 'editingteacher');
+        $roleid = self::getDataGenerator()->create_role();
+        self::getDataGenerator()->role_assign($roleid, $user->id, $context->id);
+        assign_capability('moodle/calendar:manageentries', CAP_PROHIBIT, $roleid, $context, true);
+        $generator = self::getDataGenerator()->get_plugin_generator('mod_forum');
+        // Create an instance as a user without the calendar capabilities.
+        $this->setUser($user);
+        $params = array(
+            'course' => $course->id,
+            'completionexpected' => time() + 2000,
+        );
+        $generator->create_instance($params);
+    }
+}