PHPT: Trigger runner warning on fatal-error in SKIPIF

Author: staabm

src/Runner/Phpt/TestCase.php

@@ -27,6 +27,7 @@
 use function preg_replace;
 use function preg_split;
 use function realpath;
+use function sprintf;
 use function str_contains;
 use function str_starts_with;
 use function strncasecmp;
@@ -349,6 +350,15 @@ private function shouldTestBeSkipped(array $sections, array $settings): bool
             $output = $this->runCodeInLocalSandbox($skipIfCode);
         }
 
+        if (str_contains($output, 'Fatal error:')) {
+            EventFacade::emitter()->testRunnerTriggeredPhpunitWarning(
+                sprintf(
+                    'SKIPIF section triggered a fatal error: %s',
+                    $output,
+                ),
+            );
+        }
+
         if (strncasecmp('skip', ltrim($output), 4) === 0) {
             $message = '';
 

tests/end-to-end/phpt/phpt-invalid-require.phpt

@@ -0,0 +1,12 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/6311
+--SKIPIF--
+<?php declare(strict_types=1);
+require __DIR__ . '/some/non/existing/file.php';
+
+--FILE--
+<?php declare(strict_types=1);
+
+echo "hello world\n";
+--EXPECT--
+hello world

tests/end-to-end/regression/6311.phpt

@@ -0,0 +1,25 @@
+--TEST--
+https://github.com/sebastianbergmann/phpunit/issues/6311
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = __DIR__ . '/../phpt/phpt-invalid-require.phpt';
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Runtime: %s
+
+.                                                                   1 / 1 (100%)
+
+Time: %s, Memory: %s
+
+There was 1 PHPUnit test runner warning:
+
+1) SKIPIF section triggered a fatal error: 
+Warning: require(%afile.php): Failed to open stream: No such file or directory in Standard input code on line %d
+%A