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Edit File: StaticPrefixCollectionTest.php

<?php

namespace Symfony\Component\Routing\Tests\Matcher\Dumper;

use PHPUnit\Framework\TestCase;
use Symfony\Component\Routing\Matcher\Dumper\StaticPrefixCollection;
use Symfony\Component\Routing\Route;

class StaticPrefixCollectionTest extends TestCase
{
    /**
     * @dataProvider routeProvider
     */
    public function testGrouping(array $routes, $expected)
    {
        $collection = new StaticPrefixCollection('/');

foreach ($routes as $route) {
            list($path, $name) = $route;
            $staticPrefix = (new Route($path))->compile()->getStaticPrefix();
            $collection->addRoute($staticPrefix, $name);
        }

$collection->optimizeGroups();
        $dumped = $this->dumpCollection($collection);
        $this->assertEquals($expected, $dumped);
    }

public function routeProvider()
    {
        return array(
            'Simple - not nested' => array(
                array(
                    array('/', 'root'),
                    array('/prefix/segment/', 'prefix_segment'),
                    array('/leading/segment/', 'leading_segment'),
                ),
                <<<EOF
/ root
/prefix/segment prefix_segment
/leading/segment leading_segment
EOF
            ),
            'Not nested - group too small' => array(
                array(
                    array('/', 'root'),
                    array('/prefix/segment/aa', 'prefix_segment'),
                    array('/prefix/segment/bb', 'leading_segment'),
                ),
                <<<EOF
/ root
/prefix/segment/aa prefix_segment
/prefix/segment/bb leading_segment
EOF
            ),
            'Nested - contains item at intersection' => array(
                array(
                    array('/', 'root'),
                    array('/prefix/segment/', 'prefix_segment'),
                    array('/prefix/segment/bb', 'leading_segment'),
                ),
                <<<EOF
/ root
/prefix/segment
-> /prefix/segment prefix_segment
-> /prefix/segment/bb leading_segment
EOF
            ),
            'Simple one level nesting' => array(
                array(
                    array('/', 'root'),
                    array('/group/segment/', 'nested_segment'),
                    array('/group/thing/', 'some_segment'),
                    array('/group/other/', 'other_segment'),
                ),
                <<<EOF
/ root
/group
-> /group/segment nested_segment
-> /group/thing some_segment
-> /group/other other_segment
EOF
            ),
            'Retain matching order with groups' => array(
                array(
                    array('/group/aa/', 'aa'),
                    array('/group/bb/', 'bb'),
                    array('/group/cc/', 'cc'),
                    array('/', 'root'),
                    array('/group/dd/', 'dd'),
                    array('/group/ee/', 'ee'),
                    array('/group/ff/', 'ff'),
                ),
                <<<EOF
/group
-> /group/aa aa
-> /group/bb bb
-> /group/cc cc
/ root
/group
-> /group/dd dd
-> /group/ee ee
-> /group/ff ff
EOF
            ),
            'Retain complex matching order with groups at base' => array(
                array(
                    array('/aaa/111/', 'first_aaa'),
                    array('/prefixed/group/aa/', 'aa'),
                    array('/prefixed/group/bb/', 'bb'),
                    array('/prefixed/group/cc/', 'cc'),
                    array('/prefixed/', 'root'),
                    array('/prefixed/group/dd/', 'dd'),
                    array('/prefixed/group/ee/', 'ee'),
                    array('/prefixed/group/ff/', 'ff'),
                    array('/aaa/222/', 'second_aaa'),
                    array('/aaa/333/', 'third_aaa'),
                ),
                <<<EOF
/aaa
-> /aaa/111 first_aaa
-> /aaa/222 second_aaa
-> /aaa/333 third_aaa
/prefixed
-> /prefixed/group
-> -> /prefixed/group/aa aa
-> -> /prefixed/group/bb bb
-> -> /prefixed/group/cc cc
-> /prefixed root
-> /prefixed/group
-> -> /prefixed/group/dd dd
-> -> /prefixed/group/ee ee
-> -> /prefixed/group/ff ff
EOF
            ),

'Group regardless of segments' => array(
                array(
                    array('/aaa-111/', 'a1'),
                    array('/aaa-222/', 'a2'),
                    array('/aaa-333/', 'a3'),
                    array('/group-aa/', 'g1'),
                    array('/group-bb/', 'g2'),
                    array('/group-cc/', 'g3'),
                ),
                <<<EOF
/aaa-
-> /aaa-111 a1
-> /aaa-222 a2
-> /aaa-333 a3
/group-
-> /group-aa g1
-> /group-bb g2
-> /group-cc g3
EOF
            ),
        );
    }

private function dumpCollection(StaticPrefixCollection $collection, $prefix = '')
    {
        $lines = array();

foreach ($collection->getItems() as $item) {
            if ($item instanceof StaticPrefixCollection) {
                $lines[] = $prefix.$item->getPrefix();
                $lines[] = $this->dumpCollection($item, $prefix.'-> ');
            } else {
                $lines[] = $prefix.implode(' ', $item);
            }
        }

return implode("\n", $lines);
    }
}