diff --git a/composer.json b/composer.json
index 1f85bef8dede4345c414f24a90ba9d50c15c24e1..75aba35800ffd6915c08406db02d909cfe8d5ae2 100644
--- a/composer.json
+++ b/composer.json
@@ -302,6 +302,9 @@
 			"TYPO3\\CMS\\Recycler\\Tests\\": "typo3/sysext/recycler/Tests/",
 			"TYPO3\\CMS\\T3editor\\Tests\\": "typo3/sysext/t3editor/Tests/",
 			"TYPO3\\CMS\\Tstemplate\\Tests\\": "typo3/sysext/tstemplate/Tests/",
+			"TYPO3Tests\\FluidTest\\": "typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/",
+			"TYPO3Tests\\FormCachingTests\\" : "typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Classes/",
+			"TYPO3Tests\\RequestMirror\\": "typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Classes/",
 			"TYPO3Tests\\TestDataMapper\\": "typo3/sysext/extbase/Tests/Functional/Fixtures/Extensions/test_data_mapper/Classes/",
 			"TYPO3Tests\\TestFluidTemplate\\": "typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_fluid_template/Classes/",
 			"TYPO3Tests\\TestLogger\\": "typo3/sysext/core/Tests/Functional/Fixtures/Extensions/test_logger/Classes/",
@@ -315,7 +318,6 @@
 			"typo3/sysext/core/Tests/Functional/Fixtures/",
 			"typo3/sysext/extbase/Tests/Functional/Fixtures/",
 			"typo3/sysext/extbase/Tests/Functional/Mvc/Controller/Fixture/",
-			"typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/",
 			"typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Classes/",
 			"typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Classes/"
 		]
diff --git a/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingStandaloneTest.php b/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingStandaloneTest.php
index 7eeb6c973643313f582f36f81d50b58344373e56..e08de2d9a9baa18dc841611670e5cb700b41fbc1 100644
--- a/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingStandaloneTest.php
+++ b/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingStandaloneTest.php
@@ -123,7 +123,7 @@ final class EscapeChildrenRenderingStandaloneTest extends FunctionalTestCase
     {
         $context = $this->get(RenderingContextFactory::class)->create();
         $context->getTemplatePaths()->setTemplateSource($viewHelperTemplate);
-        $context->getViewHelperResolver()->addNamespace('ft', 'TYPO3Fluid\\FluidTest\\ViewHelpers');
+        $context->getViewHelperResolver()->addNamespace('ft', 'TYPO3Tests\\FluidTest\\ViewHelpers');
         $view = new TemplateView($context);
         $view->assign('settings', ['test' => '<strong>Bla</strong>']);
         self::assertSame($expectedOutput, $view->render());
diff --git a/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingTest.php b/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingTest.php
index 79a2c31fe8439420069319844efa1e4f2d127652..a8629ca23d48dfdf2f6704be3a92f7ad4cb15247 100644
--- a/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingTest.php
+++ b/typo3/sysext/fluid/Tests/Functional/EscapeChildrenRenderingTest.php
@@ -122,7 +122,7 @@ final class EscapeChildrenRenderingTest extends FunctionalTestCase
     {
         $view = new TemplateView();
         $view->assign('settings', ['test' => '<strong>Bla</strong>']);
-        $view->getRenderingContext()->getViewHelperResolver()->addNamespace('ft', 'TYPO3Fluid\\FluidTest\\ViewHelpers');
+        $view->getRenderingContext()->getViewHelperResolver()->addNamespace('ft', 'TYPO3Tests\\FluidTest\\ViewHelpers');
         $view->getRenderingContext()->getTemplatePaths()->setTemplateSource($viewHelperTemplate);
         self::assertSame($expectedOutput, $view->render());
     }
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/Controller/TemplateController.php b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/Controller/TemplateController.php
index 4c094c5102ac01b1abc3b32ab46e84be08334445..84786e762a8752523a977ed1ac68a1f816e52825 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/Controller/TemplateController.php
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/Controller/TemplateController.php
@@ -15,7 +15,7 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3Fluid\FluidTest\Controller;
+namespace TYPO3Tests\FluidTest\Controller;
 
 use Psr\Http\Message\ResponseInterface;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/AbstractEscapingBaseViewHelper.php b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/AbstractEscapingBaseViewHelper.php
index 95f53f890e9cc867a1f70c62c3a4a17d19599079..88cbfddfe43e806b4ec1ebb83f827e7867b6428c 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/AbstractEscapingBaseViewHelper.php
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/AbstractEscapingBaseViewHelper.php
@@ -15,13 +15,10 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3Fluid\FluidTest\ViewHelpers;
+namespace TYPO3Tests\FluidTest\ViewHelpers;
 
 use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
 
-/**
- * Class EscapingInterceptorDisabledViewHelper
- */
 abstract class AbstractEscapingBaseViewHelper extends AbstractViewHelper
 {
     public function initializeArguments(): void
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputDisabledViewHelper.php b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputDisabledViewHelper.php
index d9f513a13cca213796a398157080b8d8ba1524f5..46d3f55e8fbcc6f53b581fe07d2da4b5cfbf8e5c 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputDisabledViewHelper.php
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputDisabledViewHelper.php
@@ -15,11 +15,8 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3Fluid\FluidTest\ViewHelpers;
+namespace TYPO3Tests\FluidTest\ViewHelpers;
 
-/**
- * Class EscapeChildrenDisabledAndEscapeOutputDisabledViewHelper
- */
 class EscapeChildrenDisabledAndEscapeOutputDisabledViewHelper extends AbstractEscapingBaseViewHelper
 {
     protected $escapeChildren = false;
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputEnabledViewHelper.php b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputEnabledViewHelper.php
index 476eb5b04dd01c5a2c4845c3a728b27d9b75c8e4..4bb9481cb263fe06bdfeff9bbda15eac91bfd828 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputEnabledViewHelper.php
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenDisabledAndEscapeOutputEnabledViewHelper.php
@@ -15,11 +15,8 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3Fluid\FluidTest\ViewHelpers;
+namespace TYPO3Tests\FluidTest\ViewHelpers;
 
-/**
- * Class EscapeChildrenDisabledAndEscapeOutputEnabledViewHelper
- */
 class EscapeChildrenDisabledAndEscapeOutputEnabledViewHelper extends AbstractEscapingBaseViewHelper
 {
     protected $escapeChildren = false;
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputDisabledViewHelper.php b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputDisabledViewHelper.php
index dc6eb34365af4b29c6fec01aa9f8e34bedd47b9a..d4c4478da1b61913531928a4439b2a14355262f1 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputDisabledViewHelper.php
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputDisabledViewHelper.php
@@ -15,11 +15,8 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3Fluid\FluidTest\ViewHelpers;
+namespace TYPO3Tests\FluidTest\ViewHelpers;
 
-/**
- * Class EscapeChildrenEnabledAndEscapeOutputDisabledViewHelper
- */
 class EscapeChildrenEnabledAndEscapeOutputDisabledViewHelper extends AbstractEscapingBaseViewHelper
 {
     protected $escapeChildren = true;
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputEnabledViewHelper.php b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputEnabledViewHelper.php
index 4581a389ced13d887325554d1b3d29b06b3236be..eb4a564071f09bf7e8d08d152761f003d877995d 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputEnabledViewHelper.php
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Classes/ViewHelpers/EscapeChildrenEnabledAndEscapeOutputEnabledViewHelper.php
@@ -15,11 +15,8 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3Fluid\FluidTest\ViewHelpers;
+namespace TYPO3Tests\FluidTest\ViewHelpers;
 
-/**
- * Class EscapeChildrenEnabledAndEscapeOutputEnabledViewHelper
- */
 class EscapeChildrenEnabledAndEscapeOutputEnabledViewHelper extends AbstractEscapingBaseViewHelper
 {
     protected $escapeChildren = true;
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Configuration/Services.yaml b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Configuration/Services.yaml
index 1d533f9a6cf49dfb19bd38ae0e9d3a6c2c05b7bd..ecec653af73aac1580940742dff0aacd734c9757 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Configuration/Services.yaml
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/Configuration/Services.yaml
@@ -4,5 +4,5 @@ services:
     autoconfigure: true
     public: false
 
-  TYPO3Fluid\FluidTest\:
+  TYPO3Tests\FluidTest\:
     resource: '../Classes/*'
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/composer.json b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/composer.json
index a7fca1e243df140b9586ea7eebc6b5859dff686e..8ae929d92bcc2b36c0aecc5625dee6f31b99ffd8 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/composer.json
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/composer.json
@@ -1,16 +1,19 @@
 {
-    "name": "typo3/fixture-fluid-test",
-    "type": "typo3-cms-extension",
-    "description": "Some Fluid rendering tests",
-    "license": "GPL-2.0-or-later",
-    "autoload": {
-        "psr-4": {
-            "TYPO3Fluid\\FluidTest\\": "Classes"
-        }
-    },
-    "extra": {
-        "typo3/cms": {
-            "extension-key": "fluid_test"
-        }
-    }
+	"name": "typo3tests/fixture-fluid-test",
+	"type": "typo3-cms-extension",
+	"description": "Some Fluid rendering tests",
+	"license": "GPL-2.0-or-later",
+	"require": {
+		"typo3/cms-core": "13.0.*@dev"
+	},
+	"autoload": {
+		"psr-4": {
+			"TYPO3Tests\\FluidTest\\": "Classes"
+		}
+	},
+	"extra": {
+		"typo3/cms": {
+			"extension-key": "fluid_test"
+		}
+	}
 }
diff --git a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/ext_emconf.php b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/ext_emconf.php
index 6dae6f65d6bcc3a5c8ddcf0b9705df4b8338f51d..f763e9ef35cb5cc1ad334dfb03a744ef58fc29a3 100644
--- a/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/ext_emconf.php
+++ b/typo3/sysext/fluid/Tests/Functional/Fixtures/Extensions/fluid_test/ext_emconf.php
@@ -20,12 +20,7 @@ $EM_CONF[$_EXTKEY] = [
     ],
     'autoload' => [
         'psr-4' => [
-            'TYPO3Fluid\\FluidTest\\' => 'Classes',
-        ],
-    ],
-    'autoload-dev' => [
-        'psr-4' => [
-            'TYPO3Fluid\\FluidTest\\Tests\\' => 'Tests',
+            'TYPO3Tests\\FluidTest\\' => 'Classes',
         ],
     ],
 ];
diff --git a/typo3/sysext/fluid/Tests/Functional/View/TemplatesPathsTest.php b/typo3/sysext/fluid/Tests/Functional/View/TemplatesPathsTest.php
index 7884e63fbb121f04ecb4b2e24ac49b60d8b9f6f0..a9ca3d1c8f0a2b0b9f86d06869ef69a0545b0574 100644
--- a/typo3/sysext/fluid/Tests/Functional/View/TemplatesPathsTest.php
+++ b/typo3/sysext/fluid/Tests/Functional/View/TemplatesPathsTest.php
@@ -20,7 +20,7 @@ namespace TYPO3\CMS\Fluid\Tests\Functional\View;
 use TYPO3\CMS\Core\Tests\Functional\SiteHandling\SiteBasedTestTrait;
 use TYPO3\TestingFramework\Core\Functional\Framework\Frontend\InternalRequest;
 use TYPO3\TestingFramework\Core\Functional\FunctionalTestCase;
-use TYPO3Fluid\FluidTest\Controller\TemplateController;
+use TYPO3Tests\FluidTest\Controller\TemplateController;
 
 final class TemplatesPathsTest extends FunctionalTestCase
 {
diff --git a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Classes/Controller/FormCachingTestsController.php b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Classes/Controller/FormCachingTestsController.php
index f613d10fc4af3d1e2c06762f85a7c4763ae80a08..6eca5ae5d8d1d2096f527644450083077aed6352 100644
--- a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Classes/Controller/FormCachingTestsController.php
+++ b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Classes/Controller/FormCachingTestsController.php
@@ -15,7 +15,7 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3\CMS\FormCachingTests\Controller;
+namespace TYPO3Tests\FormCachingTests\Controller;
 
 use Psr\Http\Message\ResponseInterface;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
diff --git a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Configuration/Services.yaml b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Configuration/Services.yaml
index 743acda3f4a6b02ecd10fc2843b11d9b2083f83d..9cdbc0abced7b5fc05771f0bdbd7884d8f5659e1 100644
--- a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Configuration/Services.yaml
+++ b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/Configuration/Services.yaml
@@ -4,5 +4,5 @@ services:
     autoconfigure: true
     public: false
 
-  TYPO3\CMS\FormCachingTests\:
+  TYPO3Tests\FormCachingTests\:
     resource: '../Classes/*'
diff --git a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/composer.json b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/composer.json
index 068513a2927ca7acac5e8d6557c4379038eb7e18..c4d2e250f97b1e81c30004e0834852bf6d5e8458 100644
--- a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/composer.json
+++ b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/composer.json
@@ -1,11 +1,14 @@
 {
-	"name": "typo3/cms-form-caching-tests",
+	"name": "typo3tests/cms-form-caching-tests",
 	"type": "typo3-cms-extension",
 	"description": "",
 	"license": ["GPL-2.0-or-later"],
+	"require": {
+		"typo3/cms-core": "13.0.*@dev"
+	},
 	"autoload": {
 		"psr-4": {
-			"TYPO3\\CMS\\FormCachingTests\\": "Classes/"
+			"TYPO3Tests\\FormCachingTests\\": "Classes/"
 		}
 	},
 	"extra": {
diff --git a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/ext_localconf.php b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/ext_localconf.php
index b8c31a9efb93d23ef883ffbb9919fc0f2c20126a..987cb1976172f03c02f4166d45feb4f012c48172 100644
--- a/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/ext_localconf.php
+++ b/typo3/sysext/form/Tests/Functional/RequestHandling/Fixtures/Extensions/form_caching_tests/ext_localconf.php
@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
 use TYPO3\CMS\Extbase\Utility\ExtensionUtility;
-use TYPO3\CMS\FormCachingTests\Controller\FormCachingTestsController;
+use TYPO3Tests\FormCachingTests\Controller\FormCachingTestsController;
 
 defined('TYPO3') or die();
 
diff --git a/typo3/sysext/form/Tests/Functional/Service/Fixtures/Extensions/form_labels/composer.json b/typo3/sysext/form/Tests/Functional/Service/Fixtures/Extensions/form_labels/composer.json
new file mode 100644
index 0000000000000000000000000000000000000000..6727deb7ee42f9281d8776766f9604d8ee9c9270
--- /dev/null
+++ b/typo3/sysext/form/Tests/Functional/Service/Fixtures/Extensions/form_labels/composer.json
@@ -0,0 +1,14 @@
+{
+	"name": "typo3tests/test-form-labels",
+	"type": "typo3-cms-extension",
+	"description": "",
+	"license": ["GPL-2.0-or-later"],
+	"require": {
+		"typo3/cms-core": "13.0.*@dev"
+	},
+	"extra": {
+		"typo3/cms": {
+			"extension-key": "form_labels"
+		}
+	}
+}
diff --git a/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_fluid_template/composer.json b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_fluid_template/composer.json
index dc69c2818b305ddd386011ed2b097cd8ab6412ec..a868e07606276904f7a2ba87492e65ad8143f38c 100644
--- a/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_fluid_template/composer.json
+++ b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_fluid_template/composer.json
@@ -1,16 +1,19 @@
 {
-    "name": "typo3/fixture-fluid-template-content-object-test",
-    "type": "typo3-cms-extension",
-    "description": "FluidTemplateContentObject Test",
-    "license": "GPL-2.0-or-later",
-    "autoload": {
-        "psr-4": {
-            "TYPO3Tests\\TestFluidTemplate\\": "Classes"
-        }
-    },
-    "extra": {
-        "typo3/cms": {
-            "extension-key": "test_fluid_template"
-        }
-    }
+	"name": "typo3tests/fixture-fluid-template-content-object-test",
+	"type": "typo3-cms-extension",
+	"description": "FluidTemplateContentObject Test",
+	"license": "GPL-2.0-or-later",
+	"require": {
+		"typo3/cms-core": "13.0.*@dev"
+	},
+	"autoload": {
+		"psr-4": {
+			"TYPO3Tests\\TestFluidTemplate\\": "Classes"
+		}
+	},
+	"extra": {
+		"typo3/cms": {
+			"extension-key": "test_fluid_template"
+		}
+	}
 }
diff --git a/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Classes/Middleware/RequestMirror.php b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Classes/Middleware/RequestMirror.php
index 2bd45d9b1f9ed2d17897090bdb1c71e74fa6370f..6b3c6a9d90feed42536bac3c96fba173315d76d1 100644
--- a/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Classes/Middleware/RequestMirror.php
+++ b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Classes/Middleware/RequestMirror.php
@@ -15,7 +15,7 @@ declare(strict_types=1);
  * The TYPO3 project - inspiring people to share!
  */
 
-namespace TYPO3\RequestMirror\Middleware;
+namespace TYPO3Tests\RequestMirror\Middleware;
 
 use Psr\Http\Message\ResponseFactoryInterface;
 use Psr\Http\Message\ResponseInterface;
diff --git a/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Configuration/RequestMiddlewares.php b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Configuration/RequestMiddlewares.php
index 49b801a497221267b05f4c5e10264fed027d7ce0..ab0710dc888e9f085f4a3954fbe7d23d6288c4a4 100644
--- a/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Configuration/RequestMiddlewares.php
+++ b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/Configuration/RequestMiddlewares.php
@@ -3,7 +3,7 @@
 return [
     'frontend' => [
         'typo3/request-mirror' => [
-            'target' => \TYPO3\RequestMirror\Middleware\RequestMirror::class,
+            'target' => \TYPO3Tests\RequestMirror\Middleware\RequestMirror::class,
             'after' => [
                 'typo3/cms-core/normalized-params-attribute',
             ],
diff --git a/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/composer.json b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/composer.json
new file mode 100644
index 0000000000000000000000000000000000000000..075841c35f45a1220a168cf7828e2efe7a109c01
--- /dev/null
+++ b/typo3/sysext/frontend/Tests/Functional/Fixtures/Extensions/test_request_mirror/composer.json
@@ -0,0 +1,19 @@
+{
+	"name": "typo3tests/test-request-mirror",
+	"type": "typo3-cms-extension",
+	"description": "a fixture extension for fluid functional tests",
+	"license": "GPL-2.0-or-later",
+	"require": {
+		"typo3/cms-core": "13.0.*@dev"
+	},
+	"autoload": {
+		"psr-4": {
+			"TYPO3Tests\\RequestMirror\\": "Classes"
+		}
+	},
+	"extra": {
+		"typo3/cms": {
+			"extension-key": "test_request_mirror"
+		}
+	}
+}
diff --git a/typo3/sysext/impexp/Tests/Functional/Fixtures/Extensions/template_extension/composer.json b/typo3/sysext/impexp/Tests/Functional/Fixtures/Extensions/template_extension/composer.json
new file mode 100644
index 0000000000000000000000000000000000000000..3b019b74b8cebe3555547f824f22beb5a4ac2cdb
--- /dev/null
+++ b/typo3/sysext/impexp/Tests/Functional/Fixtures/Extensions/template_extension/composer.json
@@ -0,0 +1,14 @@
+{
+	"name": "typo3tests/test-impexp-template",
+	"type": "typo3-cms-extension",
+	"description": "a fixture extension for impexp functional tests",
+	"license": "GPL-2.0-or-later",
+	"require": {
+		"typo3/cms-core": "13.0.*@dev"
+	},
+	"extra": {
+		"typo3/cms": {
+			"extension-key": "template_extension"
+		}
+	}
+}