simplify tests for asserting private property

Author: mvorisek

tests/TokenizerTest.php

@@ -15,11 +15,23 @@
 
 final class TokenizerTest extends TestCase
 {
-    public function testKeywordsReservedAreUpperCasedAndWithoutWhitespace(): void
+    /**
+     * @param 'reserved'|'reservedToplevel'|'reservedNewline' $propertyName
+     *
+     * @return list<string>
+     */
+    private function getTokenizerList(string $propertyName): array
     {
         $tokenizerReflClass = new ReflectionClass(Tokenizer::class);
-        /** @var list<string> $tokenizerReserved */
-        $tokenizerReserved = $tokenizerReflClass->getProperty('reserved')->getDefaultValue();
+        /** @var list<string> $res */
+        $res = $tokenizerReflClass->getProperty($propertyName)->getDefaultValue();
+
+        return $res;
+    }
+
+    public function testKeywordsReservedAreUpperCasedAndWithoutWhitespace(): void
+    {
+        $tokenizerReserved = $this->getTokenizerList('reserved');
 
         $kwsDiff = array_filter($tokenizerReserved, static function ($v) {
             return $v !== strtoupper($v) || preg_match('~\s~', $v) !== 0;