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Edit File: InitialRender.php

<?php

namespace Livewire\Features\SupportTesting;

use Livewire\Drawer\Utils;

class InitialRender extends Render
{
    function __construct(
        protected RequestBroker $requestBroker,
    ) {}

static function make($requestBroker, $name, $params = [], $fromQueryString = [], $cookies = [], $headers = [])
    {
        $instance = new static($requestBroker);

return $instance->makeInitialRequest($name, $params, $fromQueryString, $cookies, $headers);
    }

function makeInitialRequest($name, $params, $fromQueryString = [], $cookies = [], $headers = [])
    {
        $uri = '/livewire-unit-test-endpoint/'.str()->random(20);

$this->registerRouteBeforeExistingRoutes($uri, function () use ($name, $params) {
            return \Illuminate\Support\Facades\Blade::render('@livewire($name, $params)', [
                'name' => $name,
                'params' => $params,
            ]);
        });

[$response, $componentInstance, $componentView] = $this->extractComponentAndBladeView(function () use ($uri, $fromQueryString, $cookies, $headers) {
            return $this->requestBroker->temporarilyDisableExceptionHandlingAndMiddleware(function ($requestBroker) use ($uri, $fromQueryString, $cookies, $headers) {
                return $requestBroker->addHeaders($headers)->call('GET', $uri, $fromQueryString, $cookies);
            });
        });

app('livewire')->flushState();

$html = $response->getContent();

// Set "original" to Blade view for assertions like "assertViewIs()"...
        $response->original = $componentView;

$snapshot = Utils::extractAttributeDataFromHtml($html, 'wire:snapshot');
        $effects = Utils::extractAttributeDataFromHtml($html, 'wire:effects');

return new ComponentState($componentInstance, $response, $componentView, $html, $snapshot, $effects);
    }

private function registerRouteBeforeExistingRoutes($path, $closure)
    {
        // To prevent this route from overriding wildcard routes registered within the application,
        // We have to make sure that this route is registered before other existing routes.
        $livewireTestingRoute = new \Illuminate\Routing\Route(['GET', 'HEAD'], $path, $closure);

$existingRoutes = app('router')->getRoutes();

// Make an empty collection.
        $runningCollection = new \Illuminate\Routing\RouteCollection;

// Add this testing route as the first one.
        $runningCollection->add($livewireTestingRoute);

// Now add the existing routes after it.
        foreach ($existingRoutes as $route) {
            $runningCollection->add($route);
        }

// Now set this route collection as THE route collection for the app.
        app('router')->setRoutes($runningCollection);
    }
}

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