use named global exception handler to make test more obvious

Author: staabm

tests/end-to-end/regression/5592-process-isolation.phpt

@@ -7,7 +7,11 @@ $_SERVER['argv'][] = '--no-configuration';
 $_SERVER['argv'][] = '--process-isolation';
 $_SERVER['argv'][] = __DIR__ . '/5592/Issue5592TestIsolation.php';
 
-set_exception_handler(static fn () => null);
+function global5592IsolationExceptionHandler(Throwable $exception): void
+{
+}
+
+set_exception_handler('global5592IsolationExceptionHandler');
 
 require_once __DIR__ . '/../../bootstrap.php';
 (new PHPUnit\TextUI\Application)->run($_SERVER['argv']);

tests/end-to-end/regression/5592.phpt

@@ -6,7 +6,11 @@ $_SERVER['argv'][] = '--do-not-cache-result';
 $_SERVER['argv'][] = '--no-configuration';
 $_SERVER['argv'][] = __DIR__ . '/5592/Issue5592Test.php';
 
-set_exception_handler(static fn () => null);
+function global5592ExceptionHandler(Throwable $exception): void
+{
+}
+
+set_exception_handler('global5592ExceptionHandler');
 
 require_once __DIR__ . '/../../bootstrap.php';
 (new PHPUnit\TextUI\Application)->run($_SERVER['argv']);

tests/end-to-end/regression/5592/Issue5592Test.php

@@ -13,7 +13,6 @@
 use function restore_exception_handler;
 use function set_error_handler;
 use function set_exception_handler;
-use Closure;
 use PHPUnit\Framework\TestCase;
 use PHPUnit\Runner\ErrorHandler;
 use Throwable;
@@ -48,15 +47,15 @@ public function testAddedAndRemovedExceptionHandler(): void
         $previous = set_exception_handler([$this, 'addedAndRemovedExceptionHandler']);
         restore_exception_handler();
 
-        $this->assertInstanceOf(Closure::class, $previous);
+        $this->assertSame('global5592ExceptionHandler', $previous);
         $this->assertTrue(true);
     }
 
     public function testAddedExceptionHandler(): void
     {
         $previous = set_exception_handler([$this, 'addedExceptionHandler']);
 
-        $this->assertInstanceOf(Closure::class, $previous);
+        $this->assertSame('global5592ExceptionHandler', $previous);
         $this->assertTrue(false);
     }