public function testRemove() {
$this
->assertEquals('world', $this->bag
->get('hello'));
$this->bag
->remove('hello');
$this
->assertNull($this->bag
->get('hello'));
$this
->assertEquals('be happy', $this->bag
->get('always'));
$this->bag
->remove('always');
$this
->assertNull($this->bag
->get('always'));
$this
->assertEquals('drak', $this->bag
->get('user.login'));
$this->bag
->remove('user.login');
$this
->assertNull($this->bag
->get('user.login'));
}