Make this test portable

Author: sebastianbergmann

tests/end-to-end/regression/5561.phpt

@@ -17,9 +17,9 @@ require_once __DIR__ . '/../../bootstrap.php';
 <testsuites>
   <testsuite name="PHPUnit\TestFixture\Issue5561\Issue5561Test" file="%sIssue5561Test.php" tests="1" assertions="0" errors="0" failures="1" skipped="0" time="%s">
     <testcase name="testOne" file="%sIssue5561Test.php" line="21" class="PHPUnit\TestFixture\Issue5561\Issue5561Test" classname="PHPUnit.TestFixture.Issue5561.Issue5561Test" assertions="0" time="%s">
-      <failure type="PHPUnit\Framework\ExpectationFailedException">PHPUnit\TestFixture\Issue5561\Issue5561Test::testOne
+      <failure type="PHPUnit\Framework\ExpectationFailedException">PHPUnit\TestFixture\Issue5561\Issue5561Test::testOne%A
 Failed asserting that false is true.
-
+%A
 %sIssue5561Test.php:18</failure>
     </testcase>
   </testsuite>