add test

Author: devnexen

ext/bz2/tests/gh20620.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Bug GH-20620 (bzcompress with large source)
+--EXTENSIONS--
+bz2
+--SKIPIF--
+<?php if (PHP_INT_SIZE != 8) die('skip this test is for 64bit platforms only');i ?>
+--INI--
+memory_limit=-1
+--FILE--
+<?php
+try {
+	bzcompress(str_repeat('1', 4295163906));
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
+?>
+--EXPECTF--
+bzcompress(): Argument #1 ($data) must be less than or equal to %d