public function testMerge()
{
$c = new TestConfiguration(['db' => ['user' => 'app', 'passwd' => 'test']]);
$c->mergeWith(['db' => ['passwd' => '123', 'host' => 'local']]);
$this->assertEquals('app', $c->get('db.user'));
$this->assertEquals('123', $c->get('db.passwd'));
$this->assertEquals('local', $c->get('db.host'));
}
