ProcessTest::testShutdown PHP Method

    public function testShutdown()
    {
        $process = new \Jenner\SimpleFork\Process(function () {
            sleep(3);
        });
        $time = time();
        $process->start();
        $process->shutdown(SIGKILL);
        $this->assertFalse($process->isRunning());
        $this->assertTrue(time() - $time < 3);
        $this->assertTrue($process->ifSignal());
        $this->assertEquals(0, $process->errno());
    }