diff --git a/addons/payment_stripe/i18n/payment_stripe.pot b/addons/payment_stripe/i18n/payment_stripe.pot
index 27219e15f1c..7802c3d3588 100644
--- a/addons/payment_stripe/i18n/payment_stripe.pot
+++ b/addons/payment_stripe/i18n/payment_stripe.pot
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Server 15.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2022-01-11 09:46+0000\n"
-"PO-Revision-Date: 2022-01-11 09:46+0000\n"
+"POT-Creation-Date: 2022-02-22 14:45+0000\n"
+"PO-Revision-Date: 2022-02-22 14:45+0000\n"
 "Last-Translator: \n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -191,6 +191,14 @@ msgid ""
 "You cannot create a Stripe Webhook if your Stripe Secret Key is not set."
 msgstr ""
 
+#. module: payment_stripe
+#: code:addons/payment_stripe/models/payment_acquirer.py:0
+#, python-format
+msgid ""
+"You cannot set the acquirer to Test Mode while it is linked with your Stripe"
+" account."
+msgstr ""
+
 #. module: payment_stripe
 #: code:addons/payment_stripe/models/payment_acquirer.py:0
 #, python-format
diff --git a/addons/payment_stripe/models/payment_acquirer.py b/addons/payment_stripe/models/payment_acquirer.py
index 1eb84d28dfc..01d26006c99 100644
--- a/addons/payment_stripe/models/payment_acquirer.py
+++ b/addons/payment_stripe/models/payment_acquirer.py
@@ -6,7 +6,7 @@ import uuid
 import requests
 from werkzeug.urls import url_join, url_encode
 
-from odoo import _, fields, models
+from odoo import _, api, fields, models
 from odoo.exceptions import ValidationError
 
 from odoo.addons.payment_stripe.const import API_VERSION, PROXY_URL, WEBHOOK_HANDLED_EVENTS
@@ -32,6 +32,41 @@ class PaymentAcquirer(models.Model):
              "authenticate the messages sent from Stripe to Odoo.",
         groups='base.group_system')
 
+    #=== CONSTRAINT METHODS ===#
+
+    @api.constrains('state', 'stripe_publishable_key', 'stripe_secret_key')
+    def _check_state_of_connected_account_is_never_test(self):
+        """ Check that the acquirer of a connected account can never been set to 'test'.
+
+        This constraint is defined in the present module to allow the export of the translation
+        string of the `ValidationError` that can be raised by the internal module responsible for
+        Stripe Connect, although this constraint depends on a field that is defined in that external
+        module.
+        Additionally, having the field defined in the external module prevents from using it
+        as a trigger for this constraint. This is however not a problem because the field `state` is
+        used as trigger, and we always write on `state` when we write on the internal field.
+
+        :return: None
+        """
+        for acquirer in self:
+            if acquirer.state == 'test' and acquirer._stripe_has_connected_account():
+                raise ValidationError(_(
+                    "You cannot set the acquirer to Test Mode while it is linked with your Stripe "
+                    "account."
+                ))
+
+    def _stripe_has_connected_account(self):
+        """ Return whether the acquirer is linked to a connected Stripe account.
+
+        Note: This method is overridden by the internal module responsible for Stripe Connect.
+        Note: self.ensure_one()
+
+        :return: Whether the acquirer is linked to a connected Stripe account
+        :rtype: bool
+        """
+        self.ensure_one()
+        return False
+
     # === ACTION METHODS === #
 
     def action_stripe_connect_account(self, menu_id=None):
diff --git a/addons/payment_stripe/views/payment_views.xml b/addons/payment_stripe/views/payment_views.xml
index f43cc51af21..882dfcd7e1d 100644
--- a/addons/payment_stripe/views/payment_views.xml
+++ b/addons/payment_stripe/views/payment_views.xml
@@ -9,7 +9,7 @@
             <xpath expr="//group[@name='acquirer']" position="before">
                 <group invisible="context.get('stripe_onboarding', False)"
                        name="stripe_onboarding_group"
-                       attrs="{'invisible': ['|', ('provider', '!=', 'stripe'), '&amp;', ('stripe_secret_key', '!=', False), ('stripe_publishable_key', '!=', False)]}">
+                       attrs="{'invisible': ['|', '|', ('provider', '!=', 'stripe'), ('stripe_secret_key', '!=', False), ('stripe_publishable_key', '!=', False)]}">
                     <button string="Connect Stripe"
                             type="object"
                             name="action_stripe_connect_account"