MC-31920: Let Magento\Framework\Lock\Backend\Database have 2 locks in single connection

- Update unit test;

Author: adifucan

lib/internal/Magento/Framework/Lock/Backend/Database.php

@@ -10,9 +10,9 @@
 use Magento\Framework\App\DeploymentConfig;
 use Magento\Framework\App\ResourceConnection;
 use Magento\Framework\Config\ConfigOptionsListConstants;
-use Magento\Framework\Exception\AlreadyExistsException;
-use Magento\Framework\Phrase;
 use Magento\Framework\DB\ExpressionConverter;
+use Magento\Framework\Exception\FileSystemException;
+use Magento\Framework\Exception\RuntimeException;
 
 /**
  * Implementation of the lock manager on the basis of MySQL.
@@ -68,7 +68,8 @@ public function __construct(
      * @param string $name lock name
      * @param int $timeout How long to wait lock acquisition in seconds, negative value means infinite timeout
      * @return bool
-     * @throws AlreadyExistsException
+     * @throws FileSystemException
+     * @throws RuntimeException
      * @throws \Zend_Db_Statement_Exception
      */
     public function lock(string $name, int $timeout = -1): bool

lib/internal/Magento/Framework/Lock/Test/Unit/Backend/DatabaseTest.php

@@ -85,7 +85,6 @@ protected function setUp()
     }
 
     /**
-     * @throws \Magento\Framework\Exception\AlreadyExistsException
      * @throws \Zend_Db_Statement_Exception
      */
     public function testLock()
@@ -102,7 +101,6 @@ public function testLock()
     }
 
     /**
-     * @throws \Magento\Framework\Exception\AlreadyExistsException
      * @throws \Zend_Db_Statement_Exception
      */
     public function testlockWithTooLongName()
@@ -119,9 +117,7 @@ public function testlockWithTooLongName()
     }
 
     /**
-     * @throws \Magento\Framework\Exception\AlreadyExistsException
      * @throws \Zend_Db_Statement_Exception
-     * @expectedException \Magento\Framework\Exception\AlreadyExistsException
      */
     public function testlockWithAlreadyAcquiredLockInSameSession()
     {
@@ -133,12 +129,11 @@ public function testlockWithAlreadyAcquiredLockInSameSession()
             ->method('fetchColumn')
             ->willReturn(true);
 
-        $this->database->lock('testLock');
-        $this->database->lock('differentLock');
+        $this->assertTrue($this->database->lock('testLock'));
+        $this->assertTrue($this->database->lock('differentLock'));
     }
 
     /**
-     * @throws \Magento\Framework\Exception\AlreadyExistsException
      * @throws \Zend_Db_Statement_Exception
      */
     public function testLockWithUnavailableDeploymentConfig()