Initial EV files

system/Test/Filters/CITestStreamFilter.php

@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * This file is part of the 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;
+
+/**
+ * Class to extract an output snapshot.
+ * 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 = '';
+
+	/**
+	 * Output filtering - catch it all.
+	 *
+	 * @param resource $in
+	 * @param resource $out
+	 * @param integer  $consumed
+	 * @param boolean  $closing
+	 *
+	 * @return integer
+	 */
+	public function filter($in, $out, &$consumed, $closing)
+	{
+		while ($bucket = stream_bucket_make_writeable($in))
+		{
+			static::$buffer .= $bucket->data;
+
+			$consumed += $bucket->datalen;
+		}
+
+		// @phpstan-ignore-next-line
+		return PSFS_PASS_ON;
+	}
+}
+
+// @codeCoverageIgnoreStart
+stream_filter_register('CITestStreamFilter', 'CodeIgniter\Test\Filters\CITestStreamFilter');
+// @codeCoverageIgnoreEnd