docs: fix sample code in testing/controllers

`namespace CodeIgniter` should not be used in app testing.

Author: kenjis

user_guide_src/source/testing/controllers/001.php

@@ -1,12 +1,12 @@
 <?php
 
-namespace CodeIgniter;
+namespace App\Controllers;
 
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\ControllerTestTrait;
 use CodeIgniter\Test\DatabaseTestTrait;
 
-class TestControllerA extends CIUnitTestCase
+class FooControllerTest extends CIUnitTestCase
 {
     use ControllerTestTrait;
     use DatabaseTestTrait;

user_guide_src/source/testing/controllers/002.php

@@ -1,20 +1,20 @@
 <?php
 
-namespace CodeIgniter;
+namespace App\Controllers;
 
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\ControllerTestTrait;
 use CodeIgniter\Test\DatabaseTestTrait;
 
-class TestControllerA extends CIUnitTestCase
+class FooControllerTest extends CIUnitTestCase
 {
     use ControllerTestTrait;
     use DatabaseTestTrait;
 
     public function testShowCategories()
     {
         $result = $this->withURI('http://example.com/categories')
-            ->controller(\App\Controllers\ForumController::class)
+            ->controller(ForumController::class)
             ->execute('showCategories');
 
         $this->assertTrue($result->isOK());

user_guide_src/source/testing/controllers/011.php

@@ -1,11 +1,11 @@
 <?php
 
-namespace CodeIgniter;
+namespace App\Filters;
 
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\FilterTestTrait;
 
-class FilterTestCase extends CIUnitTestCase
+class FooFilterTest extends CIUnitTestCase
 {
     use FilterTestTrait;
 }

user_guide_src/source/testing/controllers/012.php

@@ -1,11 +1,11 @@
 <?php
 
-namespace CodeIgniter;
+namespace App\Filters;
 
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\FilterTestTrait;
 
-final class FilterTestCase extends CIUnitTestCase
+final class FooFilterTest extends CIUnitTestCase
 {
     use FilterTestTrait;
 

user_guide_src/source/testing/controllers/014.php

@@ -1,11 +1,11 @@
 <?php
 
-namespace CodeIgniter;
+namespace App\Filters;
 
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\FilterTestTrait;
 
-final class FilterTestCase extends CIUnitTestCase
+final class FooFilterTest extends CIUnitTestCase
 {
     use FilterTestTrait;