Add constants for C & C pages in our E2E tests (https://github.com/woocommerce/woocommerce-blocks/pull/5938)

* Add constants for C & C pages in our E2E tests

Inspired by WC E2E this will avoid going to admin to find out the links for these pages.

* Select C & C pages by using the main navigation links

* Fix function calls

* Revert back to using constants for C & C block pages' URLs

reverts 9587a0bd5efa5d97b484cd8d1bf927ff50f8e014 and bd7e2f996792d887756c0a0f4a10e6886574e77b

plugins/woocommerce-blocks/tests/utils/constants.js

@@ -0,0 +1,13 @@
+/**
+ * External dependencies
+ */
+const config = require( 'config' );
+const baseUrl = config.get( 'url' );
+
+/**
+ * Shop pages.
+ *
+ * @type {string}
+ */
+export const SHOP_CART_BLOCK_PAGE = baseUrl + 'cart-block';
+export const SHOP_CHECKOUT_BLOCK_PAGE = baseUrl + 'checkout-block';

plugins/woocommerce-blocks/tests/utils/shopper.js

@@ -7,19 +7,21 @@ import { shopper as wcShopper } from '@woocommerce/e2e-utils';
  * Internal dependencies
  */
 import { getBlockPagePermalink } from './get-block-page-permalink';
+import { SHOP_CART_BLOCK_PAGE, SHOP_CHECKOUT_BLOCK_PAGE } from './constants';
 
 export const shopper = {
 	...wcShopper,
 
 	goToCheckoutBlock: async () => {
-		const checkoutBlockPermalink = await getBlockPagePermalink(
-			`Checkout Block`
-		);
-
-		await page.goto( checkoutBlockPermalink, {
+		await page.goto( SHOP_CHECKOUT_BLOCK_PAGE, {
+			waitUntil: 'networkidle0',
+		} );
+	},
+
+	goToCartBlock: async () => {
+		await page.goto( SHOP_CART_BLOCK_PAGE, {
 			waitUntil: 'networkidle0',
 		} );
-		await expect( page ).toMatchElement( 'h1', { text: 'Checkout' } );
 	},
 
 	productIsInCheckoutBlock: async ( productTitle, quantity, total ) => {