[TASK] Test parsing arithmetic operators in clamp function (#620)

Closes #619.

The test passes, whereas without the change from #607, it does not.

Co-authored-by: Jake Hotson <jake.github@qzdesign.co.uk>

Author: JakeQZ

tests/Value/ValueTest.php

@@ -72,6 +72,10 @@ public static function provideCssFunctionTemplates(): array
                 'to be parsed' => 'max(300px, %s);',
                 'expected' => 'max(300px,%s)',
             ],
+            'clamp' => [
+                'to be parsed' => 'clamp(2.19rem, %s, 2.5rem);',
+                'expected' => 'clamp(2.19rem,%s,2.5rem)',
+            ],
         ];
     }