public function testCRUDOperations()
{
$c = new Config($this->container);
$this->assertTrue($c->save(array('key1' => 'value1')));
$this->assertTrue($c->save(array('key1' => 'value2')));
$this->assertTrue($c->save(array('key2' => 'value2')));
$this->assertEquals('value2', $c->getOption('key1'));
$this->assertEquals('value2', $c->getOption('key2'));
$this->assertEquals('', $c->getOption('key3'));
$this->assertEquals('default', $c->getOption('key3', 'default'));
$this->assertTrue($c->exists('key1'));
$this->assertFalse($c->exists('key3'));
$this->assertTrue($c->save(array('key1' => 'value1')));
$this->assertArrayHasKey('key1', $c->getAll());
$this->assertArrayHasKey('key2', $c->getAll());
$this->assertContains('value1', $c->getAll());
$this->assertContains('value2', $c->getAll());
}