function test_returnAllergens()
 {
     //arrange
     $test_Allergy = new Allergy();
     $input = "10010000";
     //act
     $result = $test_Allergy->returnAllergens($input);
     //assert
     $this->assertEquals(array("eggs" => true, "peanuts" => false, "shellfish" => false, "strawberries" => true, "tomatoes" => false, "chocolate" => false, "pollen" => false, "cats" => false), $result);
 }
<?php

require_once __DIR__ . "/../vendor/autoload.php";
require_once __DIR__ . "/../src/Allergy.php";
$app = new Silex\Application();
$app->register(new Silex\Provider\TwigServiceProvider(), array('twig.path' => __DIR__ . '/../views'));
$app->get("/", function () use($app) {
    return $app['twig']->render('index.html.twig');
});
$app->get("/return_results", function () use($app) {
    $my_allergy = new Allergy();
    $results = $my_allergy->returnAllergens($_GET['allergy_code']);
    return $app['twig']->render('index.html.twig', array('results' => $results));
});
return $app;