diff --git a/static/src/js/website_sale_coupon.test.js b/static/src/js/website_sale_coupon.test.js
index deb5ba81527..68348f7c6ed 100644
--- a/static/src/js/website_sale_coupon.test.js
+++ b/static/src/js/website_sale_coupon.test.js
@@ -4,6 +4,7 @@ odoo.define('website_sale_coupon.test', function (require) {
 require("website_sale.tour");
 var tour = require("web_tour.tour");
 var base = require("web_editor.base");
+var ajax = require('web.ajax');
 
 tour.register('shop_sale_coupon', {
     test: true,
@@ -19,6 +20,11 @@ tour.register('shop_sale_coupon', {
         {
             content: "click on 'Show # found'",
             trigger: "#customize-menu a:contains(Show # found)",
+            run: function () {
+                if (!$('#customize-menu a:contains(Show # found) input').prop('checked')) {
+                    $('#customize-menu a:contains(Show # found)').click();
+                }
+            },
         },
         /* 1. Buy 1 iPad Mini, enable coupon code & insert 10% code */
         {
@@ -52,6 +58,11 @@ tour.register('shop_sale_coupon', {
         {
             content: "click on 'Coupon Code'",
             trigger: "#customize-menu a:contains(Coupon Code)",
+            run: function () {
+                if (!$('#customize-menu a:contains(Coupon Code) input').prop('checked')) {
+                    $('#customize-menu a:contains(Coupon Code)').click();
+                }
+            },
         },
         {
             content: "insert promo code '10pc'",
@@ -68,27 +79,47 @@ tour.register('shop_sale_coupon', {
             trigger: '.reward_product:contains("10.0 % discount on total amount")',
             run: function () {}, // it's a check
         },
-        /* 2. Add an Ice Cream in the cart (which has different tax than iPad) and ensure only one discount line is shown */
+        /* 2. Add a product with tax in the cart (which has different tax than iPad) and ensure only one discount line is shown */
         {
             content: "go to shop",
             trigger: '.reward_product:contains("10.0 % discount on total amount")',
             run: function () {
-                location.href = '/shop'
+                ajax.jsonRpc('/web/dataset/call', 'call', {
+                    model: 'account.tax',
+                    method: 'create',
+                    args: [{
+                      'name':'15% tax incl',
+                      'amount': 15,
+                    }],
+                }).then(function (tax_id) {
+                    ajax.jsonRpc('/web/dataset/call', 'call', {
+                        model: 'product.template',
+                        method: 'create',
+                        args: [{
+                          'name': 'Taxed Product',
+                          'taxes_id': [([6, false, [tax_id]])],
+                          'list_price': 100,
+                          'website_published': true,
+                        }],
+                    }).then(function (data) {
+                        location.href = '/shop';
+                    });
+                });
             },
         },
         {
-            content: "type Ice Cream in search",
+            content: "type Taxed Product in search",
             trigger: 'form input[name="search"]',
-            run: "text Ice Cream",
+            run: "text Taxed Product",
         },
         {
             content: "start search",
             trigger: 'form:has(input[name="search"]) .oe_search_button',
         },
         {
-            content: "select Ice Cream",
+            content: "select Taxed Product",
             extra_trigger: '.oe_search_found', // Wait to be on search results or it sometimes throws concurent error (sent search form + click on product on /shop)
-            trigger: '.oe_product_cart a:containsExact("Ice Cream")',
+            trigger: '.oe_product_cart a:containsExact("Taxed Product")',
         },
         {
             content: "click on 'Add to Cart' button",
@@ -96,7 +127,7 @@ tour.register('shop_sale_coupon', {
         },
         {
             content: "check reduction amount got recomputed and merged both discount lines into one only",
-            extra_trigger: '.oe_currency_value:contains("‑74.00")',
+            extra_trigger: '.oe_currency_value:contains("-74.00"):not(#cart_total .oe_currency_value:contains("-74.00"))',
             trigger: '.oe_website_sale .oe_cart',
             run: function () {}, // it's a check
         },
@@ -108,7 +139,7 @@ tour.register('shop_sale_coupon', {
         },
         {
             content: "check reduction amount got recomputed when changing qty",
-            trigger: '.oe_currency_value:contains("‑106.00")',
+            trigger: '.oe_currency_value:contains("-106.00")',
             run: function () {}, // it's a check
         },
         {
@@ -131,46 +162,21 @@ tour.register('shop_sale_coupon', {
             trigger: '#wrap:not(:has(.reward_product:contains("Free Product - iPad Mini")))',
             run: function () {}, // it's a check
         },
-        /* 4. Empty cart and disable coupon */
+        /* 4. Check /shop/payment does not break the `merged discount lines split per tax` (eg: with _compute_tax_id) */
         {
-            content: "remove iPad Mini from cart",
-            trigger: '#cart_products input.js_quantity[value="3"]',
-            run: "text 0",
+            content: "go to checkout",
+            trigger: 'a[href="/shop/checkout"]',
         },
         {
-            content: "remove Ice Cream from cart",
-            extra_trigger: '#wrap:not(:has(.td-product_name:contains("iPad Mini")))', // wait iPad got removed
-            trigger: '#cart_products input.js_quantity[value="1"]',
-            run: "text 0",
+            content: "Confirm checkout",
+            extra_trigger: "div.all_shipping .panel",
+            trigger: 'a[href="/shop/confirm_order"]',
         },
         {
-            content: "check cart is empty",
-            trigger: '#wrap:not(:has(#cart_products))',
+            content: "check total is unchanged",
+            trigger: '.oe_currency_value:contains("967.50")',
             run: function () {}, // it's a check
         },
-        /* 5. Disabled customize options coupon box & 'Show # found'*/
-        {
-            content: "open customize menu",
-            extra_trigger: '.oe_website_sale .oe_cart',
-            trigger: '#customize-menu > a',
-        },
-        {
-            content: "click on 'Coupon Code'",
-            trigger: "#customize-menu a:contains(Coupon Code)",
-        },
-        {
-            content: "click on 'Continue Shopping'",
-            trigger: "a:contains(Continue Shopping)",
-        },
-        {
-            content: "open customize menu",
-            extra_trigger: '.oe_website_sale #products_grid',
-            trigger: '#customize-menu > a',
-        },
-        {
-            content: "click on 'Show # found'",
-            trigger: "#customize-menu a:contains(Show # found)",
-        },
     ]
 );