public function testAddDomain()
{
$domain1 = $this->getDomainMock('foo');
$domain2 = $this->getDomainMock('bar');
$database = new Database();
$database->addDomain($domain1);
$database->addDomain($domain2);
$this->assertSame($domain1, $database->getDomain('foo'));
$this->assertSame($domain2, $database->getDomain('bar'));
$this->assertNull($database->getDomain('baz'));
}