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    <h3>Editing: ServiceLocatorTestCase.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Contracts\Service\Test;

use PHPUnit\Framework\TestCase;
use Psr\Container\ContainerInterface;
use Symfony\Contracts\Service\ServiceLocatorTrait;

abstract class ServiceLocatorTestCase extends TestCase
{
    /**
     * @return ContainerInterface
     */
    protected function getServiceLocator(array $factories)
    {
        return new class($factories) implements ContainerInterface {
            use ServiceLocatorTrait;
        };
    }

    public function testHas()
    {
        $locator = $this-&gt;getServiceLocator([
            'foo' =&gt; function () { return 'bar'; },
            'bar' =&gt; function () { return 'baz'; },
            function () { return 'dummy'; },
        ]);

        $this-&gt;assertTrue($locator-&gt;has('foo'));
        $this-&gt;assertTrue($locator-&gt;has('bar'));
        $this-&gt;assertFalse($locator-&gt;has('dummy'));
    }

    public function testGet()
    {
        $locator = $this-&gt;getServiceLocator([
            'foo' =&gt; function () { return 'bar'; },
            'bar' =&gt; function () { return 'baz'; },
        ]);

        $this-&gt;assertSame('bar', $locator-&gt;get('foo'));
        $this-&gt;assertSame('baz', $locator-&gt;get('bar'));
    }

    public function testGetDoesNotMemoize()
    {
        $i = 0;
        $locator = $this-&gt;getServiceLocator([
            'foo' =&gt; function () use (&amp;$i) {
                ++$i;

                return 'bar';
            },
        ]);

        $this-&gt;assertSame('bar', $locator-&gt;get('foo'));
        $this-&gt;assertSame('bar', $locator-&gt;get('foo'));
        $this-&gt;assertSame(2, $i);
    }

    public function testThrowsOnUndefinedInternalService()
    {
        if (!$this-&gt;getExpectedException()) {
            $this-&gt;expectException(\Psr\Container\NotFoundExceptionInterface::class);
            $this-&gt;expectExceptionMessage('The service &quot;foo&quot; has a dependency on a non-existent service &quot;bar&quot;. This locator only knows about the &quot;foo&quot; service.');
        }
        $locator = $this-&gt;getServiceLocator([
            'foo' =&gt; function () use (&amp;$locator) { return $locator-&gt;get('bar'); },
        ]);

        $locator-&gt;get('foo');
    }

    public function testThrowsOnCircularReference()
    {
        $this-&gt;expectException(\Psr\Container\ContainerExceptionInterface::class);
        $this-&gt;expectExceptionMessage('Circular reference detected for service &quot;bar&quot;, path: &quot;bar -&gt; baz -&gt; bar&quot;.');
        $locator = $this-&gt;getServiceLocator([
            'foo' =&gt; function () use (&amp;$locator) { return $locator-&gt;get('bar'); },
            'bar' =&gt; function () use (&amp;$locator) { return $locator-&gt;get('baz'); },
            'baz' =&gt; function () use (&amp;$locator) { return $locator-&gt;get('bar'); },
        ]);

        $locator-&gt;get('foo');
    }
}
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