chore: refine some tests for php8

Author: zordius

tests/helpers_for_test.php

@@ -13,7 +13,7 @@ function test() {
         return 'testMethod OK!';
     }
 
-    function helper2($arg) {
+    static function helper2($arg) {
         return is_array($arg) ? '=Array=' : "=$arg=";
     }
 
@@ -25,7 +25,7 @@ function __call($method, $args) {
 class foo {
     public $prop = 'Yes!';
 
-    function bar() {
+    static function bar() {
         return 'OK!';
     }
 }

tests/regressionTest.php

@@ -21,7 +21,7 @@ public function testIssues($issue)
         $context = LightnCandy::getContext();
         $parsed = print_r(LightnCandy::$lastParsed, true);
         if (count($context['error'])) {
-            $this->fail('Compile failed due to:' . print_r($context['error'], true) . "\nPARSED: $parsed");
+            $this->fail('Compile failed due to: ' . print_r($context['error'], true) . "\nPARSED: $parsed");
         }
         $renderer = LightnCandy::prepare($php);