Initial

system/Test/Filters/CITestStreamFilter.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Test\Filters;
+
+use php_user_filter;
+
+/**
+ * Used to capture output during unit testing, so that it can
+ * be used in assertions.
+ */
+class CITestStreamFilter extends php_user_filter
+{
+    /**
+     * Buffer to capture stream content.
+     *
+     * @var string
+     */
+    public static $buffer = '';
+
+    /**
+     * This method is called whenever data is read from or written to the
+     * attached stream (such as with fread() or fwrite()).
+     *
+     * @param resource $in
+     * @param resource $out
+     * @param int      $consumed
+     * @param bool     $closing
+     */
+    public function filter($in, $out, &$consumed, $closing): int
+    {
+        while ($bucket = stream_bucket_make_writeable($in)) {
+            static::$buffer .= $bucket->data;
+
+            $consumed += $bucket->datalen;
+        }
+
+        return PSFS_PASS_ON;
+    }
+}
+
+stream_filter_register('CITestStreamFilter', CITestStreamFilter::class); // @codeCoverageIgnore