The mix function returns the path to a versioned Mix file:
<?php $path = mix('css/app.css');
<?php         $manifest = $this->makeManifest();



        $result = mix('/unversioned.css');



        $this->assertSame('/versioned.css', $result->toHtml());
<?php         $app['config']->shouldReceive('get')->with('app.mix_hot_proxy_url');



        $manifest = $this->makeManifest();

        mix('unversioned.css');

        unlink($manifest);



        $result = mix('/unversioned.css');
<?php         mix('unversioned.css');

        unlink($manifest);



        $result = mix('/unversioned.css');



        $this->assertSame('/versioned.css', $result->toHtml());

    }
<?php         $manifest = $this->makeManifest();



        $result = mix('unversioned.css');



        $this->assertSame('/versioned.css', $result->toHtml());
<?php         $this->expectException(Exception::class);

        $this->expectExceptionMessage('Mix manifest not found');



        mix('unversioned.css', 'missing');

    }



    public function testMixWithManifestDirectory()
<?php         mkdir($directory = __DIR__.'/mix');

        $manifest = $this->makeManifest('mix');



        $result = mix('unversioned.css', 'mix');



        $this->assertSame('/mix/versioned.css', $result->toHtml());
<?php         mkdir($directory = __DIR__.'/mix');

        $manifest = $this->makeManifest('/mix');



        $result = mix('unversioned.css', 'mix');



        $this->assertSame('/mix/versioned.css', $result->toHtml());
<?php     {

        $path = $this->makeHotModuleReloadFile('https://laravel.com/docs');



        $result = mix('unversioned.css');



        $this->assertSame('//laravel.com/docs/unversioned.css', $result->toHtml());
<?php     {

        $path = $this->makeHotModuleReloadFile('http://laravel.com/docs');



        $result = mix('unversioned.css');



        $this->assertSame('//laravel.com/docs/unversioned.css', $result->toHtml());
<?php         mkdir($directory = __DIR__.'/mix');

        $path = $this->makeHotModuleReloadFile('https://laravel.com/docs', 'mix');



        $result = mix('unversioned.css', 'mix');



        $this->assertSame('//laravel.com/docs/unversioned.css', $result->toHtml());
<?php         mkdir($directory = __DIR__.'/mix');

        $path = $this->makeHotModuleReloadFile('http://laravel.com/docs', 'mix');



        $result = mix('unversioned.css', 'mix');



        $this->assertSame('//laravel.com/docs/unversioned.css', $result->toHtml());
<?php     {

        $path = $this->makeHotModuleReloadFile('');



        $result = mix('unversioned.css');



        $this->assertSame('//localhost:8080/unversioned.css', $result->toHtml());
<?php         mkdir($directory = __DIR__.'/mix');

        $path = $this->makeHotModuleReloadFile('', 'mix');



        $result = mix('unversioned.css', 'mix');



        $this->assertSame('//localhost:8080/unversioned.css', $result->toHtml());
<?php             return 'expected';

        });



        $this->assertSame('expected', mix('asset.png'));

    }

}
<?php     {

        $instance = $this->withoutMix();



        $this->assertSame('', (string) mix('path/to/asset.png'));

        $this->assertSame($this, $instance);

    }