Use JUnit XML logfile as expectation instead of test runner output

tests/end-to-end/regression/5771.phpt

@@ -3,26 +3,21 @@ https://github.com/sebastianbergmann/phpunit/issues/5771
 --FILE--
 <?php declare(strict_types=1);
 $_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = '--no-output';
 $_SERVER['argv'][] = __DIR__ . '/5771/Issue5771Test.php';
 $_SERVER['argv'][] = '--log-junit';
-$_SERVER['argv'][] = tempnam(sys_get_temp_dir(), __FILE__);
+$_SERVER['argv'][] = 'php://stdout';
 
 require_once __DIR__ . '/../../bootstrap.php';
 
 (new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
 --EXPECTF--
-PHPUnit %s by Sebastian Bergmann and contributors.
-
-Runtime: %s
-
-E 1 / 1 (100%)
-
-Time: %s, Memory: %s
-
-There was 1 error:
-
-1) PHPUnit\TestFixture\Issue5771\Issue5771Test::test
-Test was run in child process and ended unexpectedly
-
-ERRORS!
-Tests: 1, Assertions: 0, Errors: 1.
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuites>
+ <testsuite name="PHPUnit\TestFixture\Issue5771\Issue5771Test" file="%sIssue5771Test.php" tests="1" assertions="0" errors="1" failures="0" skipped="0" time="%s">
+ <testcase name="testOne" file="%sIssue5771Test.php" line="18" class="PHPUnit\TestFixture\Issue5771\Issue5771Test" classname="PHPUnit.TestFixture.Issue5771.Issue5771Test" assertions="0" time="%s">
+ <error type="PHPUnit\Framework\AssertionFailedError">PHPUnit\TestFixture\Issue5771\Issue5771Test::testOne
+Test was run in child process and ended unexpectedly</error>
+ </testcase>
+ </testsuite>
+</testsuites>

tests/end-to-end/regression/5771/Issue5771Test.php

@@ -15,7 +15,7 @@
 final class Issue5771Test extends TestCase
 {
  #[RunInSeparateProcess]
- public function test(): void
+ public function testOne(): void
  {
  exit;
  }