Unit testing issue

I'm exploring unit testing with CI4 and have run into a problem. I can test controllers without problem but any attempt to test a model or the database throws an 'headers already sent by (output started at /var/vendor/phpunit/phpunit/src/Util/Printer.php'.

I've done some digging and nothing I've found online seems applicable. I'm using the \CIDatabaseTestCase as descrideb in https://codeigniter4.github.io/userguide...abase.html, and nothing seems to be working. Any ideas?

The actual code I'm running, if it helps:

PHP Code:

namespace App\Models;

use CodeIgniter\Test\CIDatabaseTestCase;
use CodeIgniter\Test\ControllerTester;

class GroupClassesTest extends CIDatabaseTestCase{
  use ControllerTester;
  public function setup():void{
    parent::setUp();
  }
  public function tearDown():void{
    parent::tearDown();
  }
  /**
   * Test the database.
   * This is throwing the 'headers already sent' error
   */
  public function testTheDatabase(){
    $this->seeInDatabase('classes', [
      'id' => 3
    ]);
  }
} 


I have same error in featuretest but cant find any solution

What version of the framework are both of you using? Are you running just the test in question, or a suite that includes this one? How are you bootstrapping your tests?

If you haven’t already I highly recommend checking out codeigniter4projects/ProjectTests and ModuleTests for unit testing with the framework.

What version of the framework are both of you using? Are you running just the test in question, or a suite that includes this one? How are you bootstrapping your tests?

If you haven’t already I highly recommend checking out codeigniter4projects/ProjectTests and ModuleTests for unit testing with the framework.

For me, I'm using 4.0.0-rc.3 and yes, that is the only test I'm running right now. Bootstrapping-wise I'm using the default phpunit.xml.dist unless I made a change I've forgotten about. I'll check again first thing tomorrow and post here if I've updated.

Thanks for the pointers - I'd not seen the link to the projects repository in the user guide source installation directory repositories file. I'll definitely check those out!

What version of the framework are both of you using? Are you running just the test in question, or a suite that includes this one? How are you bootstrapping your tests?

If you haven’t already I highly recommend checking out codeigniter4projects/ProjectTests and ModuleTests for unit testing with the framework.

4.0.0-rc.3

I am tryint test my controllers with featuretest.

If you haven’t already I highly recommend checking out codeigniter4projects/ProjectTests and ModuleTests for unit testing with the framework.

Thanks for the pointer - I pulled down the repo and looked through it and I've get everything up and running now! I appreciate the help.