minor #31552 [Ldap] add a test to getResources and binding (Simperfit)

This PR was merged into the 3.4 branch.

Discussion
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[Ldap] add a test to getResources and binding

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | none   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        |  <!-- required for new features -->

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 - Bug fixes must be submitted against the lowest maintained branch where they apply
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We could add more unit tests, but this is a beginning.

Commits
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d08f195 minor: add some test in the ldap component

src/Symfony/Component/Ldap/Tests/Adapter/ExtLdap/EntryManagerTest.php

@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Ldap\Tests\Adapter\ExtLdap;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Ldap\Adapter\ExtLdap\Connection;
+use Symfony\Component\Ldap\Adapter\ExtLdap\EntryManager;
+use Symfony\Component\Ldap\Entry;
+
+class EntryManagerTest extends TestCase
+{
+    /**
+     * @expectedException \Symfony\Component\Ldap\Exception\NotBoundException
+     * @expectedExceptionMessage Query execution is not possible without binding the connection first.
+     */
+    public function testGetResources()
+    {
+        $connection = $this->getMockBuilder(Connection::class)->getMock();
+        $connection
+            ->expects($this->once())
+            ->method('isBound')->willReturn(false);
+
+        $entry = new Entry('$$$$$$');
+        $entryManager = new EntryManager($connection);
+        $entryManager->update($entry);
+    }
+}