Fix test type (#14)

## Describe your changes

## Issue ticket number and link

## Checklist before requesting a review
- [x] I have performed a self-review of my code
- [x] If it is a core feature, I have added thorough tests.

cypress/support/commands.ts

@@ -2,7 +2,7 @@
 
 import { colord } from 'colord'
 
-const expectColorsToMatch = (color1: string, color2: string) => {
+const expectColorsToMatch = (color1: string | undefined, color2: string | undefined) => {
   expect(Boolean(color1), 'expected both color to be defined or undefined').to.equal(Boolean(color2))
   expect(colord(color1).toHex()).to.be.equal(colord(color2).toHex())
 }