MDL-81714 tool_recyclebin: Remove unnecessary task runs in tests

I assume that it was necessary at some point to run the ad-hoc tasks in
these tests, however the only task now being run is
regrade_final_grades, which causes the tests to fail due as they produce
output.

Whether the regrade is performed or not has no impact on the result of
the test, so removing the ad-hoc task run seems appropriate.

admin/tool/recyclebin/tests/course_bin_test.php

@@ -66,9 +66,6 @@ public function test_pre_course_module_delete_hook() {
         // Delete the course module.
         course_delete_module($this->quiz->cmid);
 
-        // Now, run the course module deletion adhoc task.
-        \phpunit_util::run_all_adhoc_tasks();
-
         // Check the course module is now in the recycle bin.
         $this->assertEquals(1, $DB->count_records('tool_recyclebin_course'));
 
@@ -110,9 +107,6 @@ public function test_delete() {
         // Delete the course module.
         course_delete_module($this->quiz->cmid);
 
-        // Now, run the course module deletion adhoc task.
-        \phpunit_util::run_all_adhoc_tasks();
-
         // Try purging.
         $recyclebin = new \tool_recyclebin\course_bin($this->course->id);
         foreach ($recyclebin->get_items() as $item) {
@@ -135,9 +129,6 @@ public function test_cleanup_task() {
         // Delete the quiz.
         course_delete_module($this->quiz->cmid);
 
-        // Now, run the course module deletion adhoc task.
-        \phpunit_util::run_all_adhoc_tasks();
-
         // Set deleted date to the distant past.
         $recyclebin = new \tool_recyclebin\course_bin($this->course->id);
         foreach ($recyclebin->get_items() as $item) {
@@ -151,9 +142,6 @@ public function test_cleanup_task() {
 
         course_delete_module($book->cmid);
 
-        // Now, run the course module deletion adhoc task.
-        \phpunit_util::run_all_adhoc_tasks();
-
         // Should have 2 items now.
         $this->assertEquals(2, count($recyclebin->get_items()));
 
@@ -223,7 +211,6 @@ public function test_coursemodule_restore_with_userdata($settings) {
         // Delete quiz.
         $cm = get_coursemodule_from_instance('quiz', $this->quiz->id);
         course_delete_module($cm->id);
-        \phpunit_util::run_all_adhoc_tasks();
         $quizzes = get_coursemodules_in_course('quiz', $this->course->id);
         $this->assertEquals(0, count($quizzes));
 
@@ -260,9 +247,6 @@ public function test_coursemodule_restore_with_activity_setting_disabled() {
         // Delete the course module.
         course_delete_module($this->quiz->cmid);
 
-        // Now, run the course module deletion adhoc task.
-        \phpunit_util::run_all_adhoc_tasks();
-
         // Check there is no items in the recycle bin.
         $recyclebin = new \tool_recyclebin\course_bin($this->course->id);
         $this->assertEquals(0, count($recyclebin->get_items()));
@@ -293,7 +277,6 @@ public function test_coursemodule_restore_without_userdata($settings) {
         // Delete quiz.
         $cm = get_coursemodule_from_instance('quiz', $this->quiz->id);
         course_delete_module($cm->id);
-        \phpunit_util::run_all_adhoc_tasks();
         $quizzes = get_coursemodules_in_course('quiz', $this->course->id);
         $this->assertEquals(0, count($quizzes));