minor symfony#18711 [EventDispatcher] fix tests (xabbuh)

This PR was merged into the 3.0 branch.

Discussion
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[EventDispatcher] fix tests

| Q             | A
| ------------- | ---
| Branch?       | 3.0
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

The `getListenerPriority()` method was added to the event dispatcher
interface in Symfony 3.0. Thus, it no longer makes sense to have a test
that expects the method not to exist (the corresponding code in the
`TraceableEventDispatcher` was already removed in 576a55c.

Commits
-------

636401b [EventDispatcher] fix tests

Author: fabpot

src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php

@@ -73,16 +73,6 @@ public function testGetListenerPriority()
         $this->assertSame(123, $tdispatcher->getListenerPriority('foo', $listeners[0]));
     }
 
-    public function testGetListenerPriorityReturnsZeroWhenWrappedMethodDoesNotExist()
-    {
-        $dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
-        $traceableEventDispatcher = new TraceableEventDispatcher($dispatcher, new Stopwatch());
-        $traceableEventDispatcher->addListener('foo', function () {}, 123);
-        $listeners = $traceableEventDispatcher->getListeners('foo');
-
-        $this->assertSame(0, $traceableEventDispatcher->getListenerPriority('foo', $listeners[0]));
-    }
-
     public function testAddRemoveSubscriber()
     {
         $dispatcher = new EventDispatcher();