MDL-75111 phpunit: Move tests to use correct names and ns (take#4)

Applied the following changes to various testcase classes:

- Namespaced with component[\level2-API]
- Moved to level2-API subdirectory when required.
- Fixed incorrect use statements with leading backslash.
- Remove file phpdoc block
- Remove MOODLE_INTERNAL if not needed.
- Changed code to point to global scope when needed.
- Fix some relative paths and comments here and there.
- All them passing individually.
- Complete runs passing too.

Special mention to:

- The following task tests have been moved within the level2 directory:
  - \core\adhoc_task_test => \core\task\adhoc_task_test
  - \core\scheduled_task_test => \core\task\scheduled_task_test
  - \core\calendar_cron_task_test => \core\task\calendar_cron_task_test
  - \core\h5p_get_content_types_task_test => \core\task\h5p_get_content_types_task_test
  - \core\task_database_logger_test => \core\task\database_logger_test
  - \core\task_logging_test => \core\task\logging_test

- The following event tests have been moved within level2 directory:
  - \core\event_context_locked_test => \core\event\context_locked_test
  - \core\event_deprecated_test => \core\event\deprecated_test
  - \core\event_grade_deleted_test => \core\event\grade_deleted_test
  - \core\event_profile_field_test => \core\event\profile_field_test
  - \core\event_unknown_logged_test => \core\event\unknown_logged_test
  - \core\event_user_graded_test => \core\event\user_graded_test
  - \core\event_user_password_updated_test => \core\event\user_password_updated_test

- The following output tests have been moved within level2 directory:
  - \core\mustache_template_finder_test => \core\output\mustache_template_finder_test
  - \core\mustache_template_source_loader_test => \core\output\mustache_template_source_loader_test
  - \core\output_mustache_helper_collection_test => \core\output\mustache_helper_collection_test

- The following tests have been moved to their correct tests directories:
  - lib/tests/time_splittings_test.php => analytics/tests/time_splittings_test.php

- All the classes and tests under lib/filebrowser and lib/filestorage
  belong to core, not to core_files. Some day we should move
  them to their correct subsystem.
- All the classes and tests under lib/grade belong to core, not
  to core_grades. Some day we should move them to their correct
  subsystem.
- The core_grades_external class and its \core\grades_external_test
  unit test should belong to the grades subsystem or, alternatively,
  to \core\external, they both should be moved together.
- The core_grading_external class and its \core\grading_external_test
  unit test should belong to the grading subsystem or, alternatively,
  to \core\external, they both should be moved together.
- The \core\message\message and \core\message\inbound (may be others)
  classes, and their associated tests should go to the core_message
  subsystem.
- The core_user class, and its associated tests should go to the
  core_user subsystem.
- The \core\update namespace is plain wrong (update is not valid API)
  and needs action 1) create it or 2) move elsewhere.

analytics/tests/model_test.php

@@ -22,6 +22,8 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+namespace core_analytics;
+
 defined('MOODLE_INTERNAL') || die();
 
 require_once(__DIR__ . '/fixtures/test_indicator_max.php');
@@ -39,7 +41,7 @@ require_once(__DIR__ . '/fixtures/test_analysis.php');
  * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class analytics_model_testcase extends advanced_testcase {
+class model_test extends \advanced_testcase {
 
     public function setUp(): void {
 
@@ -183,7 +185,7 @@ class analytics_model_testcase extends advanced_testcase {
         global $DB;
         $this->resetAfterTest();
 
-        $statictarget = new test_static_target_shortname();
+        $statictarget = new \test_static_target_shortname();
         $indicators['test_indicator_max'] = \core_analytics\manager::get_indicator('test_indicator_max');
         $model = \core_analytics\model::create($statictarget, $indicators, '\core\analytics\time_splitting\quarters');
         $modelobj = $model->get_model_obj();
@@ -301,11 +303,11 @@ class analytics_model_testcase extends advanced_testcase {
             $courses[$analysable->get_id()] = $course;
         }
 
-        $target = new test_target_course_level_shortname();
+        $target = new \test_target_course_level_shortname();
         $analyser = new \core\analytics\analyser\courses(1, $target, [], [], []);
 
         $result = new \core_analytics\local\analysis\result_array(1, false, []);
-        $analysis = new test_analysis($analyser, false, $result);
+        $analysis = new \test_analysis($analyser, false, $result);
 
         // Each analysable element takes 0.5 secs minimum (test_analysis), so the max (and likely) number of analysable
         // elements that will be processed is 2.
@@ -342,7 +344,7 @@ class analytics_model_testcase extends advanced_testcase {
 
         // Training and prediction data do not get mixed.
         $result = new \core_analytics\local\analysis\result_array(1, false, []);
-        $analysis = new test_analysis($analyser, false, $result);
+        $analysis = new \test_analysis($analyser, false, $result);
         $analysis->run();
         $params = array('modelid' => 1, 'action' => 'training');
         $this->assertLessThanOrEqual(2, $DB->count_records('analytics_used_analysables', $params));
@@ -402,7 +404,7 @@ class analytics_model_testcase extends advanced_testcase {
         $this->model->update(true, [], false);
         $this->assertFalse($this->model->can_export_configuration());
 
-        $statictarget = new test_static_target_shortname();
+        $statictarget = new \test_static_target_shortname();
         $indicators['test_indicator_max'] = \core_analytics\manager::get_indicator('test_indicator_max');
         $model = \core_analytics\model::create($statictarget, $indicators, '\\core\\analytics\\time_splitting\\quarters');
         $this->assertFalse($model->can_export_configuration());
@@ -418,7 +420,7 @@ class analytics_model_testcase extends advanced_testcase {
 
         $modelconfig = new \core_analytics\model_config($this->model);
 
-        $method = new ReflectionMethod('\\core_analytics\\model_config', 'export_model_data');
+        $method = new \ReflectionMethod('\\core_analytics\\model_config', 'export_model_data');
         $method->setAccessible(true);
 
         $modeldata = $method->invoke($modelconfig);
@@ -566,7 +568,7 @@ class analytics_model_testcase extends advanced_testcase {
     private function add_fake_log() {
         global $DB, $USER;
 
-        $log = new stdClass();
+        $log = new \stdClass();
         $log->modelid = $this->modelobj->id;
         $log->version = $this->modelobj->version;
         $log->target = $this->modelobj->target;