diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f78843e8e..527ac2c12 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,9 +20,6 @@ jobs:
 
         continue-on-error: ${{ matrix.experimental }}
 
-        env:
-            SYMFONY_DEPRECATIONS_HELPER: ignoreFile=./tests/ignore-use-yield-deprecations
-
         strategy:
             matrix:
                 php-version:
@@ -64,7 +61,7 @@ jobs:
               run: vendor/bin/simple-phpunit --version
 
             - name: "Run tests"
-              run: vendor/bin/simple-phpunit
+              run: SYMFONY_DEPRECATIONS_HELPER=ignoreFile=./tests/ignore-use-yield-deprecations vendor/bin/simple-phpunit
 
     extension-tests:
         needs:
diff --git a/tests/ErrorTest.php b/tests/ErrorTest.php
index db6418ed6..ee6a86c49 100644
--- a/tests/ErrorTest.php
+++ b/tests/ErrorTest.php
@@ -304,20 +304,6 @@ EOHTML
             ],
         ];
     }
-
-    public function testTwigLeakOutputInDebugMode()
-    {
-        $output = exec(sprintf('%s %s debug', \PHP_BINARY, escapeshellarg(__DIR__.'/Fixtures/errors/leak-output.php')));
-
-        $this->assertSame('Hello OOPS', $output);
-    }
-
-    public function testDoesNotTwigLeakOutput()
-    {
-        $output = exec(sprintf('%s %s', \PHP_BINARY, escapeshellarg(__DIR__.'/Fixtures/errors/leak-output.php')));
-
-        $this->assertSame('', $output);
-    }
 }
 
 class ErrorTest_Foo
diff --git a/tests/Fixtures/errors/leak-output.php b/tests/Fixtures/errors/leak-output.php
deleted file mode 100644
index 6ad229508..000000000
--- a/tests/Fixtures/errors/leak-output.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-namespace Twig\Tests\Fixtures\errors;
-
-require __DIR__.'/../../../vendor/autoload.php';
-
-use Twig\Environment;
-use Twig\Extension\AbstractExtension;
-use Twig\Loader\ArrayLoader;
-use Twig\TwigFilter;
-
-class BrokenExtension extends AbstractExtension
-{
-    public function getFilters(): array
-    {
-        return [
-            new TwigFilter('broken', [$this, 'broken']),
-        ];
-    }
-
-    public function broken()
-    {
-        exit('OOPS');
-    }
-}
-
-$loader = new ArrayLoader([
-    'index.html.twig' => 'Hello {{ "world"|broken }}',
-]);
-$twig = new Environment($loader, ['debug' => isset($argv[1]), 'use_yield' => false]);
-$twig->addExtension(new BrokenExtension());
-
-echo $twig->render('index.html.twig');