Fix PhpUnit 8 compatibility

src/Symfony/Bundle/FrameworkBundle/Test/BaseKernelTestCase.php

@@ -20,8 +20,10 @@
  * KernelTestCase is the base class for tests needing a Kernel.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
  */
-abstract class KernelTestCase extends TestCase
+abstract class BaseKernelTestCase extends TestCase
 {
     protected static $class;
 
@@ -220,12 +222,4 @@ protected static function ensureKernelShutdown()
             }
         }
     }
-
-    /**
-     * Clean up Kernel usage in this test.
-     */
-    protected function tearDown()
-    {
-        static::ensureKernelShutdown();
-    }
 }

src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.php

@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Test;
+
+use PHPUnit\Runner\Version;
+
+if (class_exists(Version::class) && version_compare(Version::id(), '8.0.0') >= 0) {
+    class_alias(KernelTestCaseNew::class, KernelTestCase::class, true);
+} else {
+    class_alias(KernelTestCaseOld::class, KernelTestCase::class, true);
+}

src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCaseNew.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Test;
+
+/**
+ * KernelTestCaseNew is the base class for tests needing a Kernel >= PHPUNIT 8.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+abstract class KernelTestCaseNew extends BaseKernelTestCase
+{
+    /**
+     * Clean up Kernel usage in this test.
+     */
+    protected function tearDown(): void
+    {
+        static::ensureKernelShutdown();
+    }
+}

src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCaseOld.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Test;
+
+/**
+ * KernelTestCaseOld is the base class for tests needing a Kernel <= PHPUNIT 7.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+abstract class KernelTestCaseOld extends BaseKernelTestCase
+{
+    /**
+     * Clean up Kernel usage in this test.
+     */
+    protected function tearDown()
+    {
+        static::ensureKernelShutdown();
+    }
+}