add test

Author: devnexen

ext/gmp/tests/gmp_pow_fpe.phpt

@@ -6,15 +6,17 @@ gmp
 <?php
 $g = gmp_init(256);
 
-var_dump(gmp_pow($g, PHP_INT_MAX));
-var_dump(gmp_pow(256, PHP_INT_MAX));
-?>
---EXPECTF--
-object(GMP)#2 (1) {
-  ["num"]=>
-  string(%d) "%s"
+try {
+	gmp_pow($g, PHP_INT_MAX);
+} catch (\ValueError $e) {
+	echo $e->getMessage() . PHP_EOL;
 }
-object(GMP)#2 (1) {
-  ["num"]=>
-  string(%d) "%s"
+try {
+	gmp_pow(256, PHP_INT_MAX);
+} catch (\ValueError $e) {
+	echo $e->getMessage();
 }
+?>
+--EXPECT--
+base and exponent overflow
+base and exponent overflow