bug symfony#17819 [HttpKernel] Prevent a fatal error when DebugHandlersListener is used with a kernel with no terminateWithException() method (jakzal)

This PR was merged into the 2.7 branch.

Discussion
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[HttpKernel] Prevent a fatal error when DebugHandlersListener is used with a kernel with no terminateWithException() method

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

I just suffered from this bug on a project that used HttpKernelInterface implementation with no `terminateWithException() method (which is not part of the interface).

Commits
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2849152 [HttpKernel] Prevent a fatal error when DebugHandlersListener is used with a kernel with no terminateWithException() method

Author: fabpot

src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php

@@ -93,7 +93,9 @@ public function configure(Event $event = null)
         }
         if (!$this->exceptionHandler) {
             if ($event instanceof KernelEvent) {
-                $this->exceptionHandler = array($event->getKernel(), 'terminateWithException');
+                if (method_exists($event->getKernel(), 'terminateWithException')) {
+                    $this->exceptionHandler = array($event->getKernel(), 'terminateWithException');
+                }
             } elseif ($event instanceof ConsoleEvent && $app = $event->getCommand()->getApplication()) {
                 $output = $event->getOutput();
                 if ($output instanceof ConsoleOutputInterface) {

src/Symfony/Component/HttpKernel/Tests/EventListener/DebugHandlersListenerTest.php

@@ -21,7 +21,10 @@
 use Symfony\Component\Debug\ErrorHandler;
 use Symfony\Component\Debug\ExceptionHandler;
 use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\KernelEvent;
 use Symfony\Component\HttpKernel\EventListener\DebugHandlersListener;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
@@ -62,6 +65,31 @@ public function testConfigure()
         $this->assertSame(array($logger, LogLevel::INFO), $loggers[E_DEPRECATED]);
     }
 
+    public function testConfigureForHttpKernelWithNoTerminateWithException()
+    {
+        $listener = new DebugHandlersListener(null);
+        $eHandler = new ErrorHandler();
+        $event = new KernelEvent(
+            $this->getMock('Symfony\Component\HttpKernel\HttpKernelInterface'),
+            Request::create('/'),
+            HttpKernelInterface::MASTER_REQUEST
+        );
+
+        $exception = null;
+        $h = set_exception_handler(array($eHandler, 'handleException'));
+        try {
+            $listener->configure($event);
+        } catch (\Exception $exception) {
+        }
+        restore_exception_handler();
+
+        if (null !== $exception) {
+            throw $exception;
+        }
+
+        $this->assertNull($h);
+    }
+
     public function testConsoleEvent()
     {
         $dispatcher = new EventDispatcher();