diff --git a/core-bundle/tests/Controller/ContentElement/ContentElementControllerTest.php b/core-bundle/tests/Controller/ContentElement/ContentElementControllerTest.php
index 848fed7d4bf..5c6b9512785 100644
--- a/core-bundle/tests/Controller/ContentElement/ContentElementControllerTest.php
+++ b/core-bundle/tests/Controller/ContentElement/ContentElementControllerTest.php
@@ -22,12 +22,15 @@
 use Contao\CoreBundle\Twig\Loader\ContaoFilesystemLoader;
 use Contao\System;
 use Symfony\Bridge\PhpUnit\ClockMock;
+use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 
 class ContentElementControllerTest extends TestCase
 {
+    use ExpectDeprecationTrait;
+
     private ContainerBuilder $container;
 
     protected function setUp(): void
@@ -50,8 +53,13 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromTheClassName(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $response = $controller(new Request(), $this->getContentModel(), 'main');
@@ -60,8 +68,13 @@ public function testCreatesTheTemplateFromTheClassName(): void
         $this->assertSame('ce_test', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromTheTypeFragmentOptions(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController(['type' => 'foo']);
 
         $response = $controller(new Request(), $this->getContentModel(), 'main');
@@ -70,8 +83,13 @@ public function testCreatesTheTemplateFromTheTypeFragmentOptions(): void
         $this->assertSame('ce_foo', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromTheTemplateFragmentOption(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController(['template' => 'ce_bar']);
 
         $response = $controller(new Request(), $this->getContentModel(), 'main');
@@ -80,8 +98,13 @@ public function testCreatesTheTemplateFromTheTemplateFragmentOption(): void
         $this->assertSame('ce_bar', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromACustomTpl(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $this->container->set('request_stack', new RequestStack());
 
         $controller = $this->getTestController(['template' => 'ce_bar']);
@@ -94,8 +117,13 @@ public function testCreatesTheTemplateFromACustomTpl(): void
         $this->assertSame('ce_bar', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testDoesNotCreateTheTemplateFromACustomTplInTheBackend(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $request = new Request([], [], ['_scope' => 'backend']);
         $requestStack = new RequestStack();
         $requestStack->push($request);
@@ -113,8 +141,13 @@ public function testDoesNotCreateTheTemplateFromACustomTplInTheBackend(): void
         $this->assertSame('ce_test', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheClassFromTheType(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $response = $controller(new Request(), $this->getContentModel(), 'main');
@@ -124,8 +157,13 @@ public function testSetsTheClassFromTheType(): void
         $this->assertSame('ce_test', $template['class']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheHeadlineFromTheModel(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $model = $this->getContentModel(['headline' => serialize(['unit' => 'h6', 'value' => 'foobar'])]);
@@ -137,8 +175,13 @@ public function testSetsTheHeadlineFromTheModel(): void
         $this->assertSame('h6', $template['hl']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheCssIdAndClassFromTheModel(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $model = $this->getContentModel(['cssID' => serialize(['foo', 'bar'])]);
@@ -150,8 +193,13 @@ public function testSetsTheCssIdAndClassFromTheModel(): void
         $this->assertSame('ce_test bar', $template['class']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheLayoutSection(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $response = $controller(new Request(), $this->getContentModel(), 'left');
@@ -160,8 +208,13 @@ public function testSetsTheLayoutSection(): void
         $this->assertSame('left', $template['inColumn']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheClasses(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $response = $controller(new Request(), $this->getContentModel(), 'main', ['first', 'last']);
@@ -224,8 +277,13 @@ public function provideScope(): \Generator
         yield 'backend' => [true];
     }
 
+    /**
+     * @group legacy
+     */
     public function testAddsTheCacheTags(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $model = $this->getContentModel(['id' => 42]);
 
         $entityCacheTags = $this->createMock(EntityCacheTags::class);
@@ -242,8 +300,13 @@ public function testAddsTheCacheTags(): void
         $controller(new Request(), $model, 'main');
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheSharedMaxAgeIfTheElementHasAStartDate(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         ClockMock::withClockMock(true);
 
         $time = time();
@@ -262,8 +325,13 @@ public function testSetsTheSharedMaxAgeIfTheElementHasAStartDate(): void
         ClockMock::withClockMock(false);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheSharedMaxAgeIfTheElementHasAStopDate(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         ClockMock::withClockMock(true);
 
         $time = time();
@@ -282,8 +350,13 @@ public function testSetsTheSharedMaxAgeIfTheElementHasAStopDate(): void
         ClockMock::withClockMock(false);
     }
 
+    /**
+     * @group legacy
+     */
     public function testDoesNotSetTheSharedMaxAgeIfTheElementHasNeitherAStartNorAStopDate(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = new TestSharedMaxAgeController();
         $controller->setContainer($this->container);
 
diff --git a/core-bundle/tests/Controller/ContentElement/MarkdownControllerTest.php b/core-bundle/tests/Controller/ContentElement/MarkdownControllerTest.php
index ce0e728e7f4..7e48c4707c2 100644
--- a/core-bundle/tests/Controller/ContentElement/MarkdownControllerTest.php
+++ b/core-bundle/tests/Controller/ContentElement/MarkdownControllerTest.php
@@ -21,6 +21,7 @@
 use Contao\FrontendTemplate;
 use Contao\Input;
 use Contao\System;
+use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpFoundation\Request;
@@ -28,6 +29,8 @@
 
 class MarkdownControllerTest extends TestCase
 {
+    use ExpectDeprecationTrait;
+
     protected function tearDown(): void
     {
         $this->resetStaticProperties([System::class]);
@@ -35,8 +38,13 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
+    /**
+     * @group legacy
+     */
     public function testWithCodeInput(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $container = $this->mockContainer('<h1>Headline</h1>'."\n");
 
         $contentModel = $this->mockClassWithProperties(ContentModel::class);
@@ -48,8 +56,13 @@ public function testWithCodeInput(): void
         $controller(new Request(), $contentModel, 'main');
     }
 
+    /**
+     * @group legacy
+     */
     public function testDisallowedTagsAreCorrectlyStripped(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $expectedHtml = <<<'HTML'
             <h1>Headline</h1>
             &lt;iframe src&#61;&#34;https://example.com&#34;&#62;&lt;/iframe&#62;
@@ -86,8 +99,13 @@ public function testDisallowedTagsAreCorrectlyStripped(): void
         $controller(new Request(), $contentModel, 'main');
     }
 
+    /**
+     * @group legacy
+     */
     public function testWithFileInput(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $fs = new Filesystem();
         $tempTestFile = $fs->tempnam($this->getTempDir(), '');
         $fs->dumpFile($tempTestFile, '# Headline');
diff --git a/core-bundle/tests/Controller/ContentElement/TemplateControllerTest.php b/core-bundle/tests/Controller/ContentElement/TemplateControllerTest.php
index d9261914b51..3cb7fd737f5 100644
--- a/core-bundle/tests/Controller/ContentElement/TemplateControllerTest.php
+++ b/core-bundle/tests/Controller/ContentElement/TemplateControllerTest.php
@@ -18,6 +18,7 @@
 use Contao\CoreBundle\Routing\ScopeMatcher;
 use Contao\CoreBundle\Tests\TestCase;
 use Contao\FrontendTemplate;
+use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
@@ -25,8 +26,15 @@
 
 class TemplateControllerTest extends TestCase
 {
+    use ExpectDeprecationTrait;
+
+    /**
+     * @group legacy
+     */
     public function testWithDataInput(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $data = [
             ['key' => 'Key 1', 'value' => 'Value 1'],
             ['key' => 'Key 1', 'value' => 'Value 1'],
@@ -43,8 +51,13 @@ public function testWithDataInput(): void
         $controller(new Request(), $contentModel, 'main');
     }
 
+    /**
+     * @group legacy
+     */
     public function testWithoutDataInput(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $container = $this->mockContainer([], 'ce_template');
 
         $contentModel = $this->mockClassWithProperties(ContentModel::class);
@@ -56,8 +69,13 @@ public function testWithoutDataInput(): void
         $controller(new Request(), $contentModel, 'main');
     }
 
+    /**
+     * @group legacy
+     */
     public function testWithCustomTemplate(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $data = [
             ['key' => 'Key 1', 'value' => 'Value 1'],
             ['key' => 'Key 1', 'value' => 'Value 1'],
diff --git a/core-bundle/tests/Controller/FrontendModule/FrontendModuleControllerTest.php b/core-bundle/tests/Controller/FrontendModule/FrontendModuleControllerTest.php
index e0601f36dd6..12322c3b949 100644
--- a/core-bundle/tests/Controller/FrontendModule/FrontendModuleControllerTest.php
+++ b/core-bundle/tests/Controller/FrontendModule/FrontendModuleControllerTest.php
@@ -22,6 +22,7 @@
 use Contao\CoreBundle\Twig\Loader\ContaoFilesystemLoader;
 use Contao\ModuleModel;
 use Contao\System;
+use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
@@ -29,6 +30,8 @@
 
 class FrontendModuleControllerTest extends TestCase
 {
+    use ExpectDeprecationTrait;
+
     private ContainerBuilder $container;
 
     protected function setUp(): void
@@ -50,8 +53,13 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromTheClassName(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $response = $controller(new Request([], [], ['_scope' => 'frontend']), $this->getModuleModel(), 'main');
@@ -60,8 +68,13 @@ public function testCreatesTheTemplateFromTheClassName(): void
         $this->assertSame('mod_test', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromTheTypeFragmentOption(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController(['type' => 'foo']);
 
         $response = $controller(new Request(), $this->getModuleModel(), 'main');
@@ -70,8 +83,13 @@ public function testCreatesTheTemplateFromTheTypeFragmentOption(): void
         $this->assertSame('mod_foo', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromTheTemplateFragmentOption(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController(['template' => 'mod_bar']);
 
         $response = $controller(new Request(), $this->getModuleModel(), 'main');
@@ -80,8 +98,13 @@ public function testCreatesTheTemplateFromTheTemplateFragmentOption(): void
         $this->assertSame('mod_bar', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testCreatesTheTemplateFromACustomTpl(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $this->container->set('request_stack', new RequestStack());
 
         $controller = $this->getTestController();
@@ -94,8 +117,13 @@ public function testCreatesTheTemplateFromACustomTpl(): void
         $this->assertSame('mod_bar', $template['templateName']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheClassFromTheType(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $response = $controller(new Request(), $this->getModuleModel(), 'main');
@@ -105,8 +133,13 @@ public function testSetsTheClassFromTheType(): void
         $this->assertSame('mod_test', $template['class']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheHeadlineFromTheModel(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $model = $this->getModuleModel(['headline' => serialize(['unit' => 'h6', 'value' => 'foobar'])]);
@@ -118,8 +151,13 @@ public function testSetsTheHeadlineFromTheModel(): void
         $this->assertSame('h6', $template['hl']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheCssIdAndClassFromTheModel(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $model = $this->getModuleModel(['cssID' => serialize(['foo', 'bar'])]);
@@ -131,8 +169,13 @@ public function testSetsTheCssIdAndClassFromTheModel(): void
         $this->assertSame('mod_test bar', $template['class']);
     }
 
+    /**
+     * @group legacy
+     */
     public function testSetsTheLayoutSection(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $controller = $this->getTestController();
 
         $response = $controller(new Request(), $this->getModuleModel(), 'left');
@@ -248,8 +291,13 @@ public function provideScope(): \Generator
         yield 'backend' => [true];
     }
 
+    /**
+     * @group legacy
+     */
     public function testAddsTheCacheTags(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $model = $this->getModuleModel();
         $model->id = 42;
 
diff --git a/core-bundle/tests/Controller/FrontendModule/TwoFactorControllerTest.php b/core-bundle/tests/Controller/FrontendModule/TwoFactorControllerTest.php
index 3b93e384a7e..17fae706f88 100644
--- a/core-bundle/tests/Controller/FrontendModule/TwoFactorControllerTest.php
+++ b/core-bundle/tests/Controller/FrontendModule/TwoFactorControllerTest.php
@@ -26,6 +26,7 @@
 use Contao\System;
 use PHPUnit\Framework\MockObject\MockObject;
 use Scheb\TwoFactorBundle\Security\Authentication\Exception\InvalidTwoFactorCodeException;
+use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
@@ -38,6 +39,8 @@
 
 class TwoFactorControllerTest extends TestCase
 {
+    use ExpectDeprecationTrait;
+
     protected function tearDown(): void
     {
         $this->resetStaticProperties([System::class]);
@@ -65,8 +68,13 @@ public function testReturnsEmptyResponseIfTheUserIsNotFullyAuthenticated(): void
         $this->assertSame(204, $response->getStatusCode());
     }
 
+    /**
+     * @group legacy
+     */
     public function testReturnsIfTheUserIsNotAFrontendUser(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->createMock(BackendUser::class);
 
         $container = $this->getContainerWithFrameworkTemplate(
@@ -86,8 +94,13 @@ public function testReturnsIfTheUserIsNotAFrontendUser(): void
         $this->assertSame(Response::HTTP_NO_CONTENT, $response->getStatusCode());
     }
 
+    /**
+     * @group legacy
+     */
     public function testReturnsAResponseIfTheUserIsAFrontendUser(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '1';
@@ -111,8 +124,13 @@ public function testReturnsAResponseIfTheUserIsAFrontendUser(): void
         $this->assertSame(Response::HTTP_OK, $response->getStatusCode());
     }
 
+    /**
+     * @group legacy
+     */
     public function testReturnsIfTwoFactorAuthenticationIsAlreadyDisabled(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '';
@@ -137,8 +155,13 @@ public function testReturnsIfTwoFactorAuthenticationIsAlreadyDisabled(): void
         $this->assertSame(Response::HTTP_OK, $response->getStatusCode());
     }
 
+    /**
+     * @group legacy
+     */
     public function testRedirectsAfterTwoFactorHasBeenDisabled(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '1';
@@ -182,8 +205,13 @@ public function testRedirectsAfterTwoFactorHasBeenDisabled(): void
         $this->assertSame('https://localhost.wip/foobar', $response->getTargetUrl());
     }
 
+    /**
+     * @group legacy
+     */
     public function testReturnsIfTwoFactorAuthenticationIsAlreadyEnabled(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '1';
@@ -213,8 +241,13 @@ public function testReturnsIfTwoFactorAuthenticationIsAlreadyEnabled(): void
         $this->assertSame(Response::HTTP_OK, $response->getStatusCode());
     }
 
+    /**
+     * @group legacy
+     */
     public function testFailsIfTheTwoFactorCodeIsInvalid(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '';
@@ -243,8 +276,13 @@ public function testFailsIfTheTwoFactorCodeIsInvalid(): void
         $controller($request, $module, 'main', null, $page);
     }
 
+    /**
+     * @group legacy
+     */
     public function testDoesNotRedirectIfTheTwoFactorCodeIsInvalid(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '';
@@ -275,8 +313,13 @@ public function testDoesNotRedirectIfTheTwoFactorCodeIsInvalid(): void
         $controller($request, $module, 'main', null, $page);
     }
 
+    /**
+     * @group legacy
+     */
     public function testRedirectsIfTheTwoFactorCodeIsValid(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '';
@@ -314,8 +357,13 @@ public function testRedirectsIfTheTwoFactorCodeIsValid(): void
         $this->assertInstanceOf(RedirectResponse::class, $response);
     }
 
+    /**
+     * @group legacy
+     */
     public function testShowsTheBackupCodes(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '1';
@@ -341,8 +389,13 @@ public function testShowsTheBackupCodes(): void
         $this->assertSame(Response::HTTP_OK, $response->getStatusCode());
     }
 
+    /**
+     * @group legacy
+     */
     public function testGeneratesTheBackupCodes(): void
     {
+        $this->expectDeprecation('Since contao/core-bundle 5.0: Creating fragments with legacy templates is deprecated and will not work anymore in Contao 6.');
+
         $user = $this->mockClassWithProperties(FrontendUser::class);
         $user->secret = '';
         $user->useTwoFactor = '1';