refactor: align test namespaces with vendor prefix

Updates test file namespaces from Syndication\Tests to
Automattic\Syndication\Tests to match the plugin's namespace
conventions and @Package declarations already present in docblocks.

This ensures consistency across the codebase where production code
uses the Automattic vendor prefix whilst test code previously omitted
it. The change affects integration tests, unit tests, and the test
bootstrap file.

Author: GaryJones

tests/Integration/EncryptionTest.php

@@ -1,5 +1,5 @@
 <?php
-namespace Syndication\Tests;
+namespace Automattic\Syndication\Tests;
 
 use Yoast\WPTestUtils\WPIntegration\TestCase as WPIntegrationTestCase;
 

tests/Integration/EncryptorMCryptTest.php

@@ -1,5 +1,5 @@
 <?php
-namespace Syndication\Tests;
+namespace Automattic\Syndication\Tests;
 
 use Yoast\WPTestUtils\WPIntegration\TestCase as WPIntegrationTestCase;
 

tests/Integration/EncryptorOpenSSLTest.php

@@ -1,5 +1,5 @@
 <?php
-namespace Syndication\Tests;
+namespace Automattic\Syndication\Tests;
 
 use Yoast\WPTestUtils\WPIntegration\TestCase as WPIntegrationTestCase;
 

tests/Integration/EncryptorTestCase.php

@@ -1,5 +1,5 @@
 <?php
-namespace Syndication\Tests;
+namespace Automattic\Syndication\Tests;
 
 use Yoast\WPTestUtils\WPIntegration\TestCase as WPIntegrationTestCase;
 

tests/Integration/LoggerTest.php

@@ -5,7 +5,7 @@
  * @package Automattic\Syndication\Tests
  */
 
-namespace Syndication\Tests;
+namespace Automattic\Syndication\Tests;
 
 use Yoast\WPTestUtils\WPIntegration\TestCase as WPIntegrationTestCase;
 use Syndication_Logger;

tests/Integration/PullContentTest.php

@@ -5,7 +5,7 @@
  * @package Automattic\Syndication\Tests
  */
 
-namespace Syndication\Tests;
+namespace Automattic\Syndication\Tests;
 
 use Yoast\WPTestUtils\WPIntegration\TestCase as WPIntegrationTestCase;
 

tests/Unit/ClientFactoryTest.php

@@ -10,7 +10,7 @@
 
 declare( strict_types=1 );
 
-namespace Syndication\Tests\Unit;
+namespace Automattic\Syndication\Tests\Unit;
 
 /**
  * Test case for client factory class name generation.

tests/Unit/EventCounterTest.php

@@ -7,7 +7,7 @@
 
 declare( strict_types=1 );
 
-namespace Syndication\Tests\Unit;
+namespace Automattic\Syndication\Tests\Unit;
 
 use Brain\Monkey\Functions;
 use ReflectionMethod;

tests/Unit/TestCase.php

@@ -7,7 +7,7 @@
 
 declare( strict_types=1 );
 
-namespace Syndication\Tests\Unit;
+namespace Automattic\Syndication\Tests\Unit;
 
 use Yoast\WPTestUtils\BrainMonkey\TestCase as BrainMonkeyTestCase;
 

tests/bootstrap.php

@@ -7,7 +7,7 @@
 
 declare( strict_types=1 );
 
-namespace Syndication\Tests;
+namespace Automattic\Syndication\Tests;
 
 use Yoast\WPTestUtils\WPIntegration;