Add nullsafe as reference tests

Author: iluuu1994

Zend/tests/nullsafe_operator/016.phpt

@@ -0,0 +1,35 @@
+--TEST--
+Test nullsafe in function argument
+--FILE--
+<?php
+
+class Foo {
+    public $bar;
+}
+
+function set(&$ref, $value) {
+    $ref = $value;
+}
+
+function test($foo) {
+    set($foo?->bar, 'bar');
+    var_dump($foo);
+    (strrev('tes'))($foo?->bar, 'bar2');
+    var_dump($foo);
+}
+
+test(null);
+test(new Foo());
+
+?>
+--EXPECT--
+NULL
+NULL
+object(Foo)#1 (1) {
+  ["bar"]=>
+  string(3) "bar"
+}
+object(Foo)#1 (1) {
+  ["bar"]=>
+  string(4) "bar2"
+}

Zend/tests/nullsafe_operator/017.phpt

@@ -0,0 +1,40 @@
+--TEST--
+Test return nullsafe as ref
+--FILE--
+<?php
+
+class Foo {
+    public $bar;
+}
+
+function &get_bar_ref($foo) {
+    return $foo?->bar;
+}
+
+function test($foo) {
+    $barRef = &get_bar_ref($foo);
+    $barRef = 'bar';
+    unset($barRef);
+    var_dump($foo);
+
+    $barRef = &(strrev('fer_rab_teg'))($foo);
+    $barRef = 'bar2';
+    unset($barRef);
+    var_dump($foo);
+}
+
+test(null);
+test(new Foo());
+
+?>
+--EXPECT--
+NULL
+NULL
+object(Foo)#1 (1) {
+  ["bar"]=>
+  string(3) "bar"
+}
+object(Foo)#1 (1) {
+  ["bar"]=>
+  string(4) "bar2"
+}