// tests/src/Functional/BlogPageTest.php

/** @test */
public function it_loads_the_blog_page(): void {
  $this->drupalGet('/blog');

  $this->assertSession()->statusCodeEquals(200);
}
// end test

// start output
E                                                                   1 / 1 (100%)

Time: 00:01.379, Memory: 6.00 MB

There was 1 error:

1) Drupal\Tests\drupalcon\Functional\BlogPageTest::it_loads_the_blog_page
Behat\Mink\Exception\ExpectationException:
Current response status code is 404, but 200 expected.

/app/vendor/behat/mink/src/WebAssert.php:794
/app/vendor/behat/mink/src/WebAssert.php:130
/app/web/modules/custom/drupalcon/tests/src/BlogPageTest.php:16
/app/vendor/phpunit/phpunit/src/Framework/TestResult.php:728

ERRORS!
Tests: 1, Assertions: 2, Errors: 1.
// end output

// start routing
# drupalcon.routing.yml

blog.page:
 path: /blog
 defaults:
   _controller: Drupal\drupalcon\Controller\BlogPageController
   _title: Blog
 requirements:
   _permission: access content
// end routing