fix: reverse route for '' is not false

[kenjis]

Description

By default, the following code returns http://localhost:8080/index.php/ (the first route).

<?php

namespace App\Controllers;

class Home extends BaseController
{
    public function index(): string
    {
        dd(url_to(''));
    }
}

There is a test case for an empty string:

CodeIgniter4/tests/system/Helpers/URLHelper/MiscUrlTest.php

Line 866 in 0d94606

public function testUrlToThrowsOnEmptyOrMissingRoute(string $route): void

But it passes because no route is registered at the test execution.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

Can you provide more justification why '' would not logically be the route to "default URL"? I assume '/' already is. There is some precedent in RFCs to treat these as identical.

[kenjis]

@MGatner This is about Reverse Routing, not URI path.
So the parameter is a Controller::method or route name.

The '' is invalid as Controller::method or route name.

[MGatner]

Ohhh sorry, didn't read closely enough! Yes clearly a bug, thanks for clarifying.