preRefactorControllerTest.php

<?php

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class DefaultControllerTest extends WebTestCase
{
    /** @test */
    public function should_returns_200_when_all_mandatory_parameters_are_present()
    {
        $client = static::createClient();

        $client->request(
            'GET', 
            $this->queryString
                ->withCountry("us")
                ->withVertical(1)
                ->withBrand("someBrand")->build()
        );

        $this->assertEquals(200, $client->getResponse()->getStatusCode());
    }

    /** @test */
    public function should_returns_400_when_brand_is_not_present()
    {
        $client = static::createClient();

        $client->request(
            'GET',  
            $this->queryString
                ->withCountry("us")
                ->withVertical(1)->build()
        );

        $this->assertEquals(400, $client->getResponse()->getStatusCode());
    }

    /** @test */
    public function should_returns_400_when_country_is_not_present()
    {
        $client = static::createClient();

        $client->request(
            'GET', $this->queryString
                ->withBrand("someBrand")
                ->withVertical(2)->build()
        );

        $this->assertEquals(400, $client->getResponse()->getStatusCode());
    }

    /** @test */
    public function should_returns_400_when_vertical_is_not_present()
    {
        $client = static::createClient();

        $client->request(
            'GET', 
            $this->queryString
                ->withCountry("es")
                ->withBrand("someBrand")->build()
        );

        $this->assertEquals(400, $client->getResponse()->getStatusCode());
    }

    function queryString(): QueryStringBuilder
    {
        return new QueryStringBuilder();
    }
}