diff --git a/tests/php-unit-tests/README.md b/tests/php-unit-tests/README.md
index 3f556426f..22ceaec3b 100644
--- a/tests/php-unit-tests/README.md
+++ b/tests/php-unit-tests/README.md
@@ -7,8 +7,20 @@
 - Covers the consistency of some data through the app?
   - Most likely in "integration-tests".
 
-## How do I make sure that my tests are efficient?
 
+## Tests prerequisites
+
+Install iTop with default setup options : 
+- Configuration Management options : everything checked
+- Service Management for Enterprises
+- Simple Ticket Management + Customer portal
+- Simple Change Management
+
+Plus :
+-  Additional ITIL tickets : check Known Errors Management and FAQ
+
+
+## How do I make sure that my tests are efficient?
 
 ### Derive from the relevant test class
 
diff --git a/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php b/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
index 8051180f3..c14340cbc 100644
--- a/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
+++ b/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
@@ -65,6 +65,13 @@ abstract class ItopDataTestCase extends ItopTestCase
 	private $aCreatedObjects = [];
 	private $aEventListeners = [];
 
+	/**
+	 * @var bool When testing with silo, there are some cache we need to update on tearDown. Doing it all the time will cost too much, so it's opt-in !
+	 * @see tearDown
+	 * @see ResetMetaModelQueyCacheGetObject
+	 */
+	protected $bIsUsingSilo = false;
+
 	/**
 	 * @var string Default environment to use for test cases
 	 */
@@ -141,9 +148,13 @@ abstract class ItopDataTestCase extends ItopTestCase
 		CMDBObject::SetCurrentChange(null);
 
 		// Leave the place clean
-		\UserRights::Logoff();
-		$this->SetNonPublicStaticProperty(UserRights::class, 'm_aCacheUsers', []);
-		$this->ResetMetaModelQueyCacheGetObject();
+		if (UserRights::IsLoggedIn()) {
+			UserRights::Logoff();
+		}
+		$this->SetNonPublicStaticProperty(UserRights::class, 'm_aCacheUsers', []); // we could have cached rollbacked instances
+		if ($this->bIsUsingSilo) {
+			$this->ResetMetaModelQueyCacheGetObject();
+		}
 
 		foreach ($this->aEventListeners as $sListenerId) {
 			EventService::UnRegisterListener($sListenerId);
diff --git a/tests/php-unit-tests/unitary-tests/application/query/QueryTest.php b/tests/php-unit-tests/unitary-tests/application/query/QueryTest.php
index 2e9e33e65..b9a887e83 100644
--- a/tests/php-unit-tests/unitary-tests/application/query/QueryTest.php
+++ b/tests/php-unit-tests/unitary-tests/application/query/QueryTest.php
@@ -191,6 +191,8 @@ class QueryTest extends ItopDataTestCase
 	protected function tearDown(): void
 	{
 		$this->oUser->DBDelete();
+
+		parent::tearDown();
 	}
 
 }
diff --git a/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php b/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
index fcbbeb251..69ddebea8 100644
--- a/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
@@ -455,6 +455,7 @@ class DBObjectTest extends ItopDataTestCase
 	public function testCheckExtKeysSiloOnAttributeExternalKey()
 	{
 		//--- Preparing data...
+		$this->bIsUsingSilo = true;
 		$oAlwaysTrueCallback = $this->GetAlwaysTrueCallback();
 		$oAlwaysFalseCallback = $this->GetAlwaysFalseCallback();
 
@@ -532,6 +533,7 @@ class DBObjectTest extends ItopDataTestCase
 	public function testCheckExtKeysOnAttributeLinkedSetIndirect()
 	{
 		//--- Preparing data...
+		$this->bIsUsingSilo = true;
 		/** @var Organization $oDemoOrg */
 		$oDemoOrg = MetaModel::GetObjectByName(Organization::class, 'Demo');
 		/** @var Person $oPersonOnItDepartmentOrg */
@@ -633,6 +635,7 @@ class DBObjectTest extends ItopDataTestCase
 	public function testCheckExtKeysSiloOnAttributeObjectKey()
 	{
 		//--- Preparing data...
+		$this->bIsUsingSilo = true;
 		/** @var Organization $oDemoOrg */
 		$oDemoOrg = MetaModel::GetObjectByName(Organization::class, 'Demo');
 		/** @var Person $oPersonOnItDepartmentOrg */