public function ConnectionUnitTest::testOpenQueryPrefetchClose in Drupal 8

Same name and namespace in other branches

1. 9 core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php \Drupal\KernelTests\Core\Database\ConnectionUnitTest::testOpenQueryPrefetchClose()
2. 10 core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php \Drupal\KernelTests\Core\Database\ConnectionUnitTest::testOpenQueryPrefetchClose()

Tests Database::closeConnection() with a query and custom prefetch method.

File

core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php, line 157

Class

ConnectionUnitTest

Tests management of database connections.

Namespace

Drupal\KernelTests\Core\Database

Code

public function testOpenQueryPrefetchClose() {

  // Only run this test for the 'mysql' driver.
  $driver = $this->connection
    ->driver();
  if ($driver !== 'mysql') {
    $this
      ->markTestSkipped("MySql tests can not run for driver '{$driver}'.");
  }

  // Add and open a new connection.
  $this
    ->addConnection();
  $id = $this
    ->getConnectionId();
  Database::getConnection(static::TEST_TARGET_CONNECTION);

  // Verify that there is a new connection.
  $this
    ->assertConnection($id);

  // Execute a query.
  Database::getConnection(static::TEST_TARGET_CONNECTION)
    ->query('SHOW TABLES')
    ->fetchCol();

  // Close the connection.
  Database::closeConnection(static::TEST_TARGET_CONNECTION);

  // Wait 20ms to give the database engine sufficient time to react.
  usleep(20000);

  // Verify that we are back to the original connection count.
  $this
    ->assertNoConnection($id);
}