Add functionality to patch exit() on the fly

[kenjis]

When a unit test exercises code that contains exit() or die() statement, the execution of the whole test suite is aborted.

If you set TestCase::$enable_patcher true, you can make all exit() and die() throw a CIPHPUnitTestExitException instead of quitting phpunit.

If a controller is like below:

    public function index()
    {
        $this->output
            ->set_status_header(200)
            ->set_content_type('application/json', 'utf-8')
            ->set_output(json_encode(['foo' => 'bar']))
            ->_display();
        exit;
    }

A test could be:

    public function test_index()
    {
        try {
            $this->request('GET', 'welcome/index');
        } catch (CIPHPUnitTestExitException $e) {
            $output = ob_get_clean();
        }
        $this->assertContains('{"foo":"bar"}', $output);
    }

This functionality is only to rescue legacy codes. I recommend not to use exit() in your code at all.

[RodolfoSilva]

Good. 😀