add new test

ext/spl/tests/fastarray_004.phpt

@@ -0,0 +1,18 @@
+--TEST--
+SPL: FastArray: adding new elements
+--FILE--
+<?php
+
+$a = new SplFastArray(10);
+
+try {
+	$a[] = 1;
+} catch (Exception $e) {
+	var_dump($e->getMessage());
+}
+
+?>
+===DONE===
+--EXPECTF--
+string(29) "Index invalid or out of range"
+===DONE===