public function testClone() {
$env = 'test_env';
$debug = true;
$kernel = new KernelForTest($env, $debug);
$clone = clone $kernel;
$this
->assertEquals($env, $clone
->getEnvironment());
$this
->assertEquals($debug, $clone
->isDebug());
$this
->assertFalse($clone
->isBooted());
$this
->assertLessThanOrEqual(microtime(true), $clone
->getStartTime());
$this
->assertNull($clone
->getContainer());
}