[TASK] Avoid invalid methods in ImportExportUtilityTest

Method "dummy" can not be mocked since it does
not exist. Change to "don't mock anything" by
using 'null' as argument instead.

Resolves: #100473
Related: #100249
Releases: main
Change-Id: I1b53db814e6a422c129a4ad019885342e6984c8a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78481


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>

typo3/sysext/impexp/Tests/Functional/Utility/ImportExportUtilityTest.php

@@ -21,7 +21,7 @@ use TYPO3\CMS\Core\EventDispatcher\NoopEventDispatcher;
 use TYPO3\CMS\Impexp\Tests\Functional\AbstractImportExportTestCase;
 use TYPO3\CMS\Impexp\Utility\ImportExportUtility;
 
-class ImportExportUtilityTest extends AbstractImportExportTestCase
+final class ImportExportUtilityTest extends AbstractImportExportTestCase
 {
     public static function importFailsDataProvider(): array
     {
@@ -49,7 +49,7 @@ class ImportExportUtilityTest extends AbstractImportExportTestCase
 
         $importUtilityMock = $this->getAccessibleMock(
             ImportExportUtility::class,
-            ['dummy'],
+            null,
             ['eventDispatcher' => new NoopEventDispatcher()]
         );
         $importUtilityMock->importT3DFile($filePath, 0);
@@ -64,7 +64,7 @@ class ImportExportUtilityTest extends AbstractImportExportTestCase
 
         $importUtilityMock = $this->getAccessibleMock(
             ImportExportUtility::class,
-            ['dummy'],
+            null,
             ['eventDispatcher' => new NoopEventDispatcher()]
         );
         $result = $importUtilityMock->importT3DFile($filePath, 0);