MDL-81522 phpunit: Add missing void return type to all tests

While this change is not 100% required now, it's good habit
and we are checking for it since Moodle 4.4.

All the changes in this commit have been applied automatically
using the moodle.PHPUnit.TestReturnType sniff and are, exclusively
adding the ": void" return types when missing.

lib/phpunit/tests/advanced_test.php

@@ -31,7 +31,7 @@ class advanced_test extends \advanced_testcase {
         require_once(__DIR__ . '/fixtures/adhoc_test_task.php');
     }
 
-    public function test_debugging() {
+    public function test_debugging(): void {
         global $CFG;
         $this->resetAfterTest();
 
@@ -76,7 +76,7 @@ class advanced_test extends \advanced_testcase {
         $this->assertDebuggingCalled('pokus', DEBUG_MINIMAL);
     }
 
-    public function test_set_user() {
+    public function test_set_user(): void {
         global $USER, $DB, $SESSION;
 
         $this->resetAfterTest();
@@ -123,7 +123,7 @@ class advanced_test extends \advanced_testcase {
         $this->assertObjectNotHasProperty('sometestvalue', $SESSION);
     }
 
-    public function test_set_admin_user() {
+    public function test_set_admin_user(): void {
         global $USER;
 
         $this->resetAfterTest();
@@ -133,7 +133,7 @@ class advanced_test extends \advanced_testcase {
         $this->assertTrue(is_siteadmin());
     }
 
-    public function test_set_guest_user() {
+    public function test_set_guest_user(): void {
         global $USER;
 
         $this->resetAfterTest();
@@ -143,7 +143,7 @@ class advanced_test extends \advanced_testcase {
         $this->assertTrue(isguestuser());
     }
 
-    public function test_database_reset() {
+    public function test_database_reset(): void {
         global $DB;
 
         $this->resetAfterTest();
@@ -206,7 +206,7 @@ class advanced_test extends \advanced_testcase {
         $this->assertEquals(2, $DB->count_records('user'));
     }
 
-    public function test_change_detection() {
+    public function test_change_detection(): void {
         global $DB, $CFG, $COURSE, $SITE, $USER;
 
         $this->preventResetByRollback();
@@ -287,12 +287,12 @@ class advanced_test extends \advanced_testcase {
         }
     }
 
-    public function test_getDataGenerator() {
+    public function test_getDataGenerator(): void {
         $generator = $this->getDataGenerator();
         $this->assertInstanceOf('testing_data_generator', $generator);
     }
 
-    public function test_database_mock1() {
+    public function test_database_mock1(): void {
         global $DB;
 
         try {
@@ -306,14 +306,14 @@ class advanced_test extends \advanced_testcase {
         // Rest continues after reset.
     }
 
-    public function test_database_mock2() {
+    public function test_database_mock2(): void {
         global $DB;
 
         // Now the database should be back to normal.
         $this->assertFalse($DB->get_record('user', array('id'=>9999)));
     }
 
-    public function test_assert_time_current() {
+    public function test_assert_time_current(): void {
         $this->assertTimeCurrent(time());
 
         $this->setCurrentTimeStart();
@@ -395,7 +395,7 @@ class advanced_test extends \advanced_testcase {
         ];
     }
 
-    public function test_message_processors_reset() {
+    public function test_message_processors_reset(): void {
         global $DB;
 
         $this->resetAfterTest(true);
@@ -544,7 +544,7 @@ class advanced_test extends \advanced_testcase {
     /**
      * @depends test_message_redirection
      */
-    public function test_message_redirection_noreset($sink) {
+    public function test_message_redirection_noreset($sink): void {
         if ($this->isInIsolation()) {
             $this->markTestSkipped('State cannot be carried over between tests in isolated tests');
         }
@@ -575,11 +575,11 @@ class advanced_test extends \advanced_testcase {
     /**
      * @depends test_message_redirection_noreset
      */
-    public function test_message_redirection_reset() {
+    public function test_message_redirection_reset(): void {
         $this->assertFalse(\phpunit_util::is_redirecting_messages(), 'Test reset must stop message redirection.');
     }
 
-    public function test_set_timezone() {
+    public function test_set_timezone(): void {
         global $CFG;
         $this->resetAfterTest();
 
@@ -622,7 +622,7 @@ class advanced_test extends \advanced_testcase {
 
     }
 
-    public function test_locale_reset() {
+    public function test_locale_reset(): void {
         global $CFG;
 
         $this->resetAfterTest();
@@ -671,7 +671,7 @@ class advanced_test extends \advanced_testcase {
     /**
      * This test sets a user agent and makes sure that it is cleared when the test is reset.
      */
-    public function test_it_resets_useragent_after_test() {
+    public function test_it_resets_useragent_after_test(): void {
         $this->resetAfterTest();
         $fakeagent = 'New user agent set.';