Add internal test method to convert arrays of Selectors to strings

Author: JakeQZ

tests/Unit/RuleSet/DeclarationBlockTest.php

@@ -78,12 +78,8 @@ public function parsesAndReturnsSingleSelector(string $selector): void
     {
         $subject = DeclarationBlock::parse(new ParserState($selector . '{}', Settings::create()));
 
-        $resultSelectorStrings = \array_map(
-            static function (Selector $selectorObject): string {
-                return $selectorObject->getSelector();
-            },
-            $subject->getSelectors()
-        );
+        $resultSelectorStrings = self::getSelectorStringsFromObjects($subject->getSelectors());
+
         self::assertSame([$selector], $resultSelectorStrings);
     }
 
@@ -108,12 +104,23 @@ public function parsesAndReturnsTwoCommaSeparatedSelectors(string $firstSelector
         $joinedSelectors = $firstSelector . ',' . $secondSelector;
         $subject = DeclarationBlock::parse(new ParserState($joinedSelectors . '{}', Settings::create()));
 
-        $resultSelectorStrings = \array_map(
+        $resultSelectorStrings = self::getSelectorStringsFromObjects($subject->getSelectors());
+
+        self::assertSame([$firstSelector, $secondSelector], $resultSelectorStrings);
+    }
+
+    /**
+     * @param array<Selector> $selectorObjects
+     *
+     * @return array<string>
+     */
+    private static function getSelectorStringsFromObjects(array $selectorObjects): array
+    {
+        return \array_map(
             static function (Selector $selectorObject): string {
                 return $selectorObject->getSelector();
             },
-            $subject->getSelectors()
+            $selectorObjects
         );
-        self::assertSame([$firstSelector, $secondSelector], $resultSelectorStrings);
     }
 }