Slim Testable

Suppose we have simple application:

<?php
use Slim\Slim;

require_once 'vendor/autoload.php';

$app = new Slim();

$app->get('/', function(){
    echo 'home';
})->name('home');

$app->get('/hello/:name', function($name){
    echo "hello $name";
})->name('hello');

$app->map('/login', function() use($app) {
    if($app->request()->params('login')) {
        $app->flash('success', 'Successfully logged in');
        $app->redirect($app->urlFor('hello', array('name' => $app->request()->params('login'))));
    } else {
        $app->flash('error', 'Wrong login');
        $app->redirect($app->urlFor('home'));
    }
})->via('GET', 'POST');

$app->run();

How do we test it?

Create App class:

<?php // src/App.php
use Slim\Slim;

class App extends Slim {
    function __construct(array $userSettings = array())
    {
        parent::__construct($userSettings);

        $this->get('/', function(){
            echo 'home';
        })->name('home');

        $this->get('/hello/:name', function($name){
            echo "hello $name";
        })->name('hello');

        $this->map('/login', function() {
            if($this->request()->params('login')) {
                $this->flash('success', 'Successfully logged in');
                $this->redirect($this->urlFor('hello', array('name' => $this->request()->params('login'))));
            } else {
                $this->flash('error', 'Wrong login');
                $this->redirect($this->urlFor('home'));
            }
        })->via('GET', 'POST');
    }

    /**
     * @return \Slim\Http\Response
     */
    public function invoke() {
        $this->middleware[0]->call();
        $this->response()->finalize();
        return $this->response();
    }
}

Notice that we move all our routes to new class constructor, also notice new invoke method, which do the same as run method except it returns response rather than echoing it out.

Now your index.php file might be like this one:

<?php
require_once 'vendor/autoload.php';

$app = new App();
$app->run();

And now it is time for tests:

<?php // tests/ExampleTest.php
use Slim\Environment;

class ExampleTest extends PHPUnit_Framework_TestCase {
    private $app;

    public function setUp()
    {
        $_SESSION = array();
        $this->app = new App();
    }

    public function testHome() {
        Environment::mock(array(
            'PATH_INFO' => '/'
        ));
        $response = $this->app->invoke();

        $this->assertContains('home', $response->getBody());
    }

    public function testHello() {
        Environment::mock(array(
            'PATH_INFO' => '/hello/world'
        ));
        $response = $this->app->invoke();

        $this->assertTrue($response->isOk());
        $this->assertContains('hello world', $response->getBody());
    }

    public function testNotFound() {
        Environment::mock(array(
            'PATH_INFO' => '/not-exists'
        ));
        $response = $this->app->invoke();

        $this->assertTrue($response->isNotFound());
    }

    public function testLogin() {
        Environment::mock(array(
            'PATH_INFO' => '/login'
        ));
        $response = $this->app->invoke();

        $this->assertTrue($response->isRedirect());
        $this->assertEquals('Wrong login', $_SESSION['slim.flash']['error']);
        $this->assertEquals('/', $response->headers()->get('Location'));
    }

    public function testPostLogin() {
        Environment::mock(array(
            'REQUEST_METHOD' => 'POST',
            'PATH_INFO' => '/login',
            'slim.input' => 'login=world'
        ));
        $response = $this->app->invoke();

        $this->assertTrue($response->isRedirect());
        $this->assertEquals('Successfully logged in', $_SESSION['slim.flash']['success']);
        $this->assertEquals('/hello/world', $response->headers()->get('Location'));
    }

    public function testGetLogin() {
        Environment::mock(array(
            'PATH_INFO' => '/login',
            'QUERY_STRING' => 'login=world'
        ));
        $response = $this->app->invoke();

        $this->assertTrue($response->isRedirect());
        $this->assertEquals('Successfully logged in', $_SESSION['slim.flash']['success']);
        $this->assertEquals('/hello/world', $response->headers()->get('Location'));
    }
}

You should notice few things:

While setting up test we are creating $_SESSION array for test purposes and instantiate our App class object.

In tests rather than run we are calling invoke which do the same, but returns response object.

Environment::mock used to mock requests which are processed with our application.