minor #4857 Fixed the unit tests (GrahamCampbell)

This PR was merged into the 2.15 branch.

Discussion
----------

Fixed the unit tests

The tokenising linter doesn't say this is a syntax error, which is why the PHP 7.x tests were passing, but the PHP 5.6 linter doesn't like this.

Commits
-------

de80472 Fixed the unit tests

tests/Fixer/PhpUnit/PhpUnitNoExpectationAnnotationFixerTest.php

@@ -613,7 +613,7 @@ public function testFnc()
             ],
             [
                 '<?php
-    final class MyTest extends \PHPUnit_Framework_TestCase
+    abstract class MyTest extends \PHPUnit_Framework_TestCase
     {
         /**
          * @expectedException FooException