Laravel 5.4 Unit Testing with custom baseURL

I have a multi site project in Laravel 5.4. I'm trying to run site-specific tests on each domain using PHPUnit.

My setup.

1) In my .env file I have

DOMAIN_DEV_1=http://dev.site1.net
DOMAIN_DEV_2=http://dev.site2.net

2) In my CreateApplication trait of my TestCase() I have

 public function createApplication()
 {
     $app = require __DIR__.'/../bootstrap/app.php';

     $app->make(Kernel::class)->bootstrap();

     $this->baseUrl = $_ENV['DOMAIN_DEV_1'];

     // $this->baseUrl = $_ENV['DOMAIN_DEV_2'];

     return $app;
}

3) Lastly, in my phpunit.xml I have

  <php>
  ...
  <env name="DOMAIN_DEV_1" value="http://dev.site1.net"/>
  <!-- <env name="DOMAIN_DEV_2" value="http://dev.site2.net"/> -->
  </php>

Tests) So in my ExampleTest file I added in a few basic http checks inside the function testBasicTest():

   $this->assertTrue(true); //passes
   $this->assertFalse(false); //passes 

   $login = $this->get('/login');
   $login->assertStatus(200); //passes. returns 200

   $logout = $this->get('/logout');
   $logout->assertStatus(200); //returns 404

   $base = $this->get('/');
   $base->assertStatus(200); //returns 404

But the only one that works in the get('/login') assertion. Both the logout and base return 404. When I was trying to debug to make sure I was at least getting the correct baseUrl, I added in:

echo 'Domain = $this->baseUrl';

And sure enough in my command like was

PHPUnit 5.7.20 by Sebastian Bergmann and Contributors.

..FPHP Domain = http://dev.site1.net

So I'm not really sure what is going wrong exactly. Any helpful hints/pointers to the right direction?

Thanks again!