Looks like there might be a cleanup missing?

Testing src\Symfony/Component/Cache
[...]
There were 2 errors:

1. Symfony\Component\Cache\Tests\Adapter\PdoAdapterTest::testDsn with data set Untitled #1 ('sqlite:C:\Users\appveyor\AppD...E0.tmp', 'C:\Users\appveyor\AppData\Loc...E0.tmp')
   PDOException: SQLSTATE[HY000]: General error: 1 table cache_items already exists
   C:\projects\symfony\src\Symfony\Component\Cache\Adapter\PdoAdapter.php:169
   C:\projects\symfony\src\Symfony\Component\Cache\Tests\Adapter\PdoAdapterTest.php:82
2. Symfony\Component\Cache\Tests\Adapter\PdoAdapterTest::testDsn with data set Renaming "Entities" to "Entity" #2 ('sqlite3:///C:\Users\appveyor...E0.tmp', 'C:\Users\appveyor\AppData\Loc...E0.tmp')
   Doctrine\DBAL\Exception\TableExistsException: An exception occurred while executing 'CREATE TABLE cache_items (item_id CLOB NOT NULL, item_data BLOB NOT NULL, item_lifetime INTEGER UNSIGNED DEFAULT NULL, item_time INTEGER UNSIGNED NOT NULL, PRIMARY KEY(item_id))':
   SQLSTATE[HY000]: General error: 1 table cache_items already exists
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Driver\AbstractSQLiteDriver.php:47
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\DBALException.php:166
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\DBALException.php:146
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Connection.php:1100
   C:\projects\symfony\src\Symfony\Component\Cache\Adapter\PdoAdapter.php:138
   C:\projects\symfony\src\Symfony\Component\Cache\Tests\Adapter\PdoAdapterTest.php:82
   Caused by
   Doctrine\DBAL\Driver\PDOException: SQLSTATE[HY000]: General error: 1 table cache_items already exists
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Driver\PDOConnection.php:43
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Connection.php:1098
   C:\projects\symfony\src\Symfony\Component\Cache\Adapter\PdoAdapter.php:138
   C:\projects\symfony\src\Symfony\Component\Cache\Tests\Adapter\PdoAdapterTest.php:82
   Caused by
   PDOException: SQLSTATE[HY000]: General error: 1 table cache_items already exists
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Driver\PDOConnection.php:41
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Connection.php:1098
   C:\projects\symfony\src\Symfony\Component\Cache\Adapter\PdoAdapter.php:138
   C:\projects\symfony\src\Symfony\Component\Cache\Tests\Adapter\PdoAdapterTest.php:82
   ERRORS!
   Tests: 2119, Assertions: 491, Errors: 2, Skipped: 795.
   KO src\Symfony/Component/Cache

Testing src\Symfony/Component/Lock
SSSSSSSSSSSSSSSSSSSSSSS........S...EE..........SSSSSSSSSSSSSSSS 63 / 234 ( 26%)
SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
Time: 46.69 seconds, Memory: 4.00 MB
There were 2 errors:

1. Symfony\Component\Lock\Tests\Store\PdoStoreTest::testDsn with data set Untitled #1 ('sqlite:C:\Users\appveyor\AppD...1E.tmp', 'C:\Users\appveyor\AppData\Loc...1E.tmp')
   PDOException: SQLSTATE[HY000]: General error: 1 table lock_keys already exists
   C:\projects\symfony\src\Symfony\Component\Lock\Store\PdoStore.php:285
   C:\projects\symfony\src\Symfony\Component\Lock\Tests\Store\PdoStoreTest.php:86
2. Symfony\Component\Lock\Tests\Store\PdoStoreTest::testDsn with data set Renaming "Entities" to "Entity" #2 ('sqlite3:///C:\Users\appveyor...1E.tmp', 'C:\Users\appveyor\AppData\Loc...1E.tmp')
   Doctrine\DBAL\Exception\TableExistsException: An exception occurred while executing 'CREATE TABLE lock_keys (key_id VARCHAR(64) NOT NULL, key_token VARCHAR(44) NOT NULL, key_expiration INTEGER UNSIGNED NOT NULL, PRIMARY KEY(key_id))':
   SQLSTATE[HY000]: General error: 1 table lock_keys already exists
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Driver\AbstractSQLiteDriver.php:47
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\DBALException.php:166
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\DBALException.php:146
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Connection.php:1100
   C:\projects\symfony\src\Symfony\Component\Lock\Store\PdoStore.php:259
   C:\projects\symfony\src\Symfony\Component\Lock\Tests\Store\PdoStoreTest.php:86
   Caused by
   Doctrine\DBAL\Driver\PDOException: SQLSTATE[HY000]: General error: 1 table lock_keys already exists
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Driver\PDOConnection.php:43
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Connection.php:1098
   C:\projects\symfony\src\Symfony\Component\Lock\Store\PdoStore.php:259
   C:\projects\symfony\src\Symfony\Component\Lock\Tests\Store\PdoStoreTest.php:86
   Caused by
   PDOException: SQLSTATE[HY000]: General error: 1 table lock_keys already exists
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Driver\PDOConnection.php:41
   C:\projects\symfony\vendor\doctrine\dbal\lib\Doctrine\DBAL\Connection.php:1098
   C:\projects\symfony\src\Symfony\Component\Lock\Store\PdoStore.php:259
   C:\projects\symfony\src\Symfony\Component\Lock\Tests\Store\PdoStoreTest.php:86
   ERRORS!
   Tests: 107, Assertions: 71, Errors: 2, Skipped: 82.
   KO src\Symfony/Component/Lock