Avoid channels reordering issues when testing UNSUBSCRIBE.

When using UNSUBSCRIBE without a list of channels (which actually means
"unsubscribe from all the subscribed channels") Redis 2.6 does not
guarantee that channels are returned following the same order of
subscription.

tests/Predis/Command/PubSubUnsubscribeTest.php

@@ -132,8 +132,10 @@ class PubSubUnsubscribeTest extends CommandTestCase
         $this->assertSame(array('subscribe', 'channel:foo', 1), $redis->subscribe('channel:foo'));
         $this->assertSame(array('subscribe', 'channel:bar', 2), $redis->subscribe('channel:bar'));
 
-        $this->assertSame(array('unsubscribe', 'channel:foo', 1), $redis->unsubscribe());
-        $this->assertSame(array('unsubscribe', 'channel:bar', 0), $redis->getConnection()->read());
+        list($_, $unsubscribed1, $_) = $redis->unsubscribe();
+        list($_, $unsubscribed2, $_) = $redis->getConnection()->read();
+        $this->assertSameValues(array('channel:foo', 'channel:bar'), array($unsubscribed1, $unsubscribed2));
+
         $this->assertSame('echoed', $redis->echo('echoed'));
     }
 }