Add test for createCompact() itself.

Author: JakeQZ

tests/Unit/OutputFormatTest.php

@@ -1034,6 +1034,16 @@ public function createCompactReturnsInstanceWithSpaceAfterListArgumentSeparators
         self::assertSame([], $newInstance->getSpaceAfterListArgumentSeparators());
     }
 
+    /**
+     * @test
+     */
+    public function createCompactReturnsInstanceWithRenderSemicolonAfterLastRuleDisabled(): void
+    {
+        $newInstance = OutputFormat::createCompact();
+
+        self::assertFalse($newInstance->shouldRenderSemicolonAfterLastRule());
+    }
+
     /**
      * @test
      */