Fix: test the variable color

src/utils.js

@@ -59,7 +59,7 @@ const utils = {
   hex2rgb: (color) => {
     if (typeof color !== 'string') return [255, 0, 0];
 
-    if (/^#[a-fA-F0-9]{3,6}$/.test()) {
+    if (/^#[a-fA-F0-9]{3,6}$/.test(color)) {
       throw new Error('#{color} isn\'t a supported hex color');
     }