dropSchema example

$this->em->getClassMetadata(self::ITEM_GROUP_CLASS),
            $this->em->getClassMetadata(self::SINGLE_IDENT_CLASS),
            $this->em->getClassMetadata(self::SINGLE_IDENT_NO_TO_STRING_CLASS),
            $this->em->getClassMetadata(self::SINGLE_STRING_IDENT_CLASS),
            $this->em->getClassMetadata(self::SINGLE_ASSOC_IDENT_CLASS),
            $this->em->getClassMetadata(self::SINGLE_STRING_CASTABLE_IDENT_CLASS),
            $this->em->getClassMetadata(self::COMPOSITE_IDENT_CLASS),
            $this->em->getClassMetadata(self::COMPOSITE_STRING_IDENT_CLASS),
        ];

        try {
            $schemaTool->dropSchema($classes);
        } catch (\Exception $e) {
        }

        try {
            $schemaTool->createSchema($classes);
        } catch (\Exception $e) {
        }
    }

    protected function getExtensions()
    {
        

        $this->em = DoctrineTestHelper::createTestEntityManager();

        parent::setUp();

        $schemaTool = new SchemaTool($this->em);
        $classes = [
            $this->em->getClassMetadata(self::ENTITY_CLASS),
        ];

        try {
            $schemaTool->dropSchema($classes);
        } catch (\Exception $e) {
        }

        try {
            $schemaTool->createSchema($classes);
        } catch (\Exception $e) {
        }

        $ids = range(1, 300);

        foreach ($ids as $id) {