diff --git a/core/vendor/phpunit/phpunit/src/Util/PHP/Windows.php b/core/vendor/phpunit/phpunit/src/Util/PHP/Windows.php
index 17d97687563f..1a53479b7d1b 100644
--- a/core/vendor/phpunit/phpunit/src/Util/PHP/Windows.php
+++ b/core/vendor/phpunit/phpunit/src/Util/PHP/Windows.php
@@ -43,6 +43,8 @@
  * @since      File available since Release 3.5.12
  */
 
+use SebastianBergmann\Environment\Runtime;
+
 /**
  * Windows utility for PHP sub-processes.
  *
@@ -61,6 +63,58 @@ class PHPUnit_Util_PHP_Windows extends PHPUnit_Util_PHP_Default
      */
     private $tempFile;
 
+    /**
+     * {@inheritdoc}
+     *
+     * Reading from STDOUT or STDERR hangs forever on Windows if the output is
+     * too large.
+     *
+     * @see https://bugs.php.net/bug.php?id=51800
+     * @see https://github.com/sebastianbergmann/phpunit/pull/1340
+     */
+    public function runJob($job, array $settings = array())
+    {
+        $runtime = new Runtime;
+
+        if (false === $stdout_handle = tmpfile()) {
+            throw new PHPUnit_Framework_Exception(
+              'A temporary file could not be created; verify that your TEMP environment variable is writable'
+            );
+        }
+
+        $process = proc_open(
+          $runtime->getBinary() . $this->settingsToParameters($settings),
+          array(
+            0 => array('pipe', 'r'),
+            1 => $stdout_handle,
+            2 => array('pipe', 'w')
+          ),
+          $pipes
+        );
+
+        if (!is_resource($process)) {
+            throw new PHPUnit_Framework_Exception(
+              'Unable to spawn worker process'
+            );
+        }
+
+        $this->process($pipes[0], $job);
+        fclose($pipes[0]);
+
+        $stderr = stream_get_contents($pipes[2]);
+        fclose($pipes[2]);
+
+        proc_close($process);
+
+        rewind($stdout_handle);
+        $stdout = stream_get_contents($stdout_handle);
+        fclose($stdout_handle);
+
+        $this->cleanup();
+
+        return array('stdout' => $stdout, 'stderr' => $stderr);
+    }
+
     /**
      * @param  resource                    $pipe
      * @param  string                      $job