Tests Database::closeConnection() with a query.
function testOpenQueryClose() {
if ($this->skipTest) {
return;
}
// Add and open a new connection.
$this
->addConnection();
$id = $this
->getConnectionID();
Database::getConnection($this->target, $this->key);
// Verify that there is a new connection.
$this
->assertConnection($id);
// Execute a query.
Database::getConnection($this->target, $this->key)
->query('SHOW TABLES');
// Close the connection.
Database::closeConnection($this->target, $this->key);
// 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);
}