[BUGFIX] Correct file path in acceptance tests

codeception seeFileFound() and dontSeeFileFound() apply
some path magic if relative files are given. It leads
to wrong paths. This is however not (yet) shown due to
error suppression in the suite.
To work on ac test error handling for increased PHP 8
compatibility, this needs to be sorted out first.

Resolves: #93732
Releases: master, 10.4
Change-Id: I0f69ec066069261e7b47afa44e934c0b5ee02b51
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68379
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

typo3/sysext/core/Tests/Acceptance/Backend/InstallTool/AbstractCest.php

@@ -39,8 +39,8 @@ public function _after(BackendTester $I)
         $I->amGoingTo('clean up created files');
         unlink(Environment::getProjectPath() . '/' . self::ADDITIONAL_CONFIGURATION_FILEPATH);
 
-        $I->dontSeeFileFound(self::ENABLE_INSTALL_TOOL_FILEPATH);
-        $I->dontSeeFileFound(self::ADDITIONAL_CONFIGURATION_FILEPATH);
+        $I->dontSeeFileFound(Environment::getProjectPath() . '/' . self::ENABLE_INSTALL_TOOL_FILEPATH);
+        $I->dontSeeFileFound(Environment::getProjectPath() . '/' . self::ADDITIONAL_CONFIGURATION_FILEPATH);
     }
 
     protected function logIntoInstallTool(BackendTester $I)

typo3/sysext/core/Tests/Acceptance/Backend/InstallTool/LoginCest.php

@@ -17,6 +17,7 @@
 
 namespace TYPO3\CMS\Core\Tests\Acceptance\Backend\InstallTool;
 
+use TYPO3\CMS\Core\Core\Environment;
 use TYPO3\CMS\Core\Tests\Acceptance\Support\BackendTester;
 
 class LoginCest extends AbstractCest
@@ -32,12 +33,12 @@ public function installToolLogin(BackendTester $I)
 
         $I->amGoingTo('lock the tool without logging in');
         $I->writeToFile(self::ENABLE_INSTALL_TOOL_FILEPATH, '');
-        $I->seeFileFound(self::ENABLE_INSTALL_TOOL_FILEPATH);
+        $I->seeFileFound(Environment::getProjectPath() . '/' . self::ENABLE_INSTALL_TOOL_FILEPATH);
         $I->reloadPage();
         $I->see('Login to TYPO3 Install Tool');
         $I->click('Lock Install Tool again');
         $I->see('The Install Tool is locked');
-        $I->dontSeeFileFound(self::ENABLE_INSTALL_TOOL_FILEPATH);
+        $I->dontSeeFileFound(Environment::getProjectPath() . '/' . self::ENABLE_INSTALL_TOOL_FILEPATH);
 
         $I->amGoingTo('log into Install Tool');
         $this->logIntoInstallTool($I);