<?php

class ExampleTest extends TestCase {

    /**
     * A basic test example.
     *
     * @return void
     */
    public function testBasicExample()
    {
        $response = $this->call('GET', '/');

        $this->assertResponseOk();
        $this->assertEquals('Hello World', $response->getContent());
    }

}

<?php

class ExampleTest extends TestCase {

    /**
     * A basic test example.
     *
     * @return void
     */
    public function testBasicExample()
    {
        $response = $this->call('GET', '/');

        $this->assertResponseOk();
    }

}

Remove check for Hello World
Remove check for Hello World

There is no "Hello World" page on the default install, just displays "Lumen." So we should be able to assert that the response is OK to get green on a default install, similar the default test on laravel/laravel.