diff --git a/tests/php-unit-tests/README.md b/tests/php-unit-tests/README.md
index 26c32491a..0b5d06b3d 100644
--- a/tests/php-unit-tests/README.md
+++ b/tests/php-unit-tests/README.md
@@ -87,6 +87,10 @@ Add annotation `@runInSeparateProcess`
 Each and every test case will run in a separate
 process.
 
+Note : before N°6658 (3.0.4 / 3.1.1 / 3.2.0) we were also adding the `@backupGlobals disabled`
+and `@preserveGlobalState disabled` annotations. This is no longer necessary as the first has this default value
+already, and the second one is now set in iTopTestCase as a PHP class attribute.
+
 #### At the test class level
 Add annotation `@runTestsInSeparateProcesses`
 Each and every test case in the class will run in a separate
diff --git a/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php b/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
index 8f744235b..63ddbff9b 100644
--- a/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
+++ b/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
@@ -16,9 +16,7 @@ namespace Combodo\iTop\Test\UnitTest;
 use ArchivedObjectException;
 use CMDBObject;
 use CMDBSource;
-use Combodo\iTop\Service\Events\EventData;
 use Combodo\iTop\Service\Events\EventService;
-use Config;
 use Contact;
 use DBObject;
 use DBObjectSet;
@@ -34,7 +32,6 @@ use MetaModel;
 use Person;
 use PluginManager;
 use Server;
-use SetupUtils;
 use TagSetFieldData;
 use Ticket;
 use URP_UserProfile;
@@ -57,6 +54,7 @@ define('TAG_ATTCODE', 'domains');
  *
  * @since 2.7.7 3.0.1 3.1.0 N°4624 processIsolation is disabled by default and must be enabled in each test needing it (basically all tests using
  * iTop datamodel)
+ * @since 3.0.4 3.1.1 3.2.0 N°6658 move some setUp/tearDown code to the corresponding methods *BeforeClass to speed up tests process time.
  */
 abstract class ItopDataTestCase extends ItopTestCase
 {
@@ -950,6 +948,9 @@ abstract class ItopDataTestCase extends ItopTestCase
 		}
 	}
 
+	/**
+	 * @since 3.0.4 3.1.1 3.2.0 N°6658 method creation
+	 */
 	protected function assertDBChangeOpCount(string $sClass, $iId, int $iExpectedCount)
 	{
 		$oSearch = new \DBObjectSearch('CMDBChangeOp');
diff --git a/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php b/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php
index 2657836b0..75d0e71d9 100644
--- a/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php
+++ b/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php
@@ -12,12 +12,9 @@ use PHPUnit\Framework\TestCase;
 use SetupUtils;
 
 /**
- * Class ItopTestCase
- *
  * Helper class to extend for tests that DO NOT need to access the DataModel or the Database
  *
- * @author Eric Espie <eric.espie@combodo.com>
- * @package Combodo\iTop\Test\UnitTest
+ * @since 3.0.4 3.1.1 3.2.0 N°6658 move some setUp/tearDown code to the corresponding methods *BeforeClass to speed up tests process time.
  */
 abstract class ItopTestCase extends TestCase
 {
@@ -25,7 +22,10 @@ abstract class ItopTestCase extends TestCase
 	public static $DEBUG_UNIT_TEST = false;
 
 	/**
-	 * Override the default value to disable the backup of globals in case of tests run in a separate process
+	 * @link https://docs.phpunit.de/en/9.6/annotations.html#preserveglobalstate PHPUnit `preserveGlobalState` annotation documentation
+	 *
+	 * @since 3.0.4 3.1.1 3.2.0 N°6658 Override default value creation so that we don't need to add the annotation on each test classes that have runInSeparateProcess.
+	 *                    This parameter isn't used when test is run in the same process so ok to change it globally !
 	 */
 	protected $preserveGlobalState = false;
 
@@ -76,7 +76,9 @@ abstract class ItopTestCase extends TestCase
 
 	/**
 	 * @throws \MySQLTransactionNotClosedException see N°5538
+	 *
 	 * @since 2.7.8 3.0.3 3.1.0 N°5538
+	 * @since 3.0.4 3.1.1 3.2.0 N°6658 if transaction not closed, we are now doing a rollback
 	 */
 	protected function tearDown(): void
 	{
@@ -92,7 +94,11 @@ abstract class ItopTestCase extends TestCase
 		}
 	}
 
-	/** Helper than can be called in the context of a data provider */
+	/**
+	 * Helper than can be called in the context of a data provider
+	 *
+	 * @since 3.0.4 3.1.1 3.2.0 N°6658 method creation
+	 */
 	public static function GetAppRoot()
 	{
 		if (defined('APPROOT')) {