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diff --git a/addons/website/tests/test_views_inherit_module_update.py b/addons/website/tests/test_views_inherit_module_update.py
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+++ b/addons/website/tests/test_views_inherit_module_update.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo.tests import standalone
+
+"""
+This test ensure `inherit_id` update is correctly replicated on cow views.
+The view receiving the `inherit_id` update is either:
+1. in a module loaded before `website`. In that case, `website` code is not
+   loaded yet, so we store the updates to replay the changes on the cow views
+   once `website` module is loaded (see `_check()`). This test is testing that
+   part.
+2. in a module loaded after `website`. In that case, the `inherit_id` update is
+   directly replicated on the cow views. That behavior is tested with
+   `test_module_new_inherit_view_on_parent_already_forked` and
+   `test_specific_view_module_update_inherit_change` in `website` module.
+"""
+
+
+@standalone('cow_views_inherit')
+def test_01_cow_views_inherit_on_module_update(env):
+    #     A    B                        A    B
+    #    / \                   =>           / \
+    #   D   D'                             D   D'
+
+    # 1. Setup hierarchy as comment above
+    View = env['ir.ui.view']
+    View.with_context(_force_unlink=True, active_test=False).search([('website_id', '=', 1)]).unlink()
+    child_view = env.ref('portal.footer_language_selector')
+    parent_view = env.ref('portal.portal_back_in_edit_mode')
+    # Change `inherit_id` so the module update will set it back to the XML value
+    child_view.write({'inherit_id': parent_view.id, 'arch': child_view.arch_db.replace('o_footer_copyright_name', 'text-center')})
+    # Trigger COW on view
+    child_view.with_context(website_id=1).write({'name': 'COW Website 1'})
+    child_cow_view = child_view._get_specific_views()
+
+    # 2. Ensure setup is as expected
+    assert child_cow_view.inherit_id == parent_view, "Ensure test is setup as expected."
+
+    # 3. Upgrade the module
+    portal_module = env['ir.module.module'].search([('name', '=', 'portal')])
+    portal_module.button_immediate_upgrade()
+    env.reset()     # clear the set of environments
+    env = env()     # get an environment that refers to the new registry
+
+    # 4. Ensure cow view also got its inherit_id updated
+    expected_parent_view = env.ref('portal.frontend_layout')  # XML data
+    assert child_view.inherit_id == expected_parent_view, "Generic view security check."
+    assert child_cow_view.inherit_id == expected_parent_view, "COW view should also have received the `inherit_id` update."
+
+
+@standalone('cow_views_inherit')
+def test_02_cow_views_inherit_on_module_update(env):
+    #     A    B    B'                  A    B   B'
+    #    / \                   =>            |   |
+    #   D   D'                               D   D'
+
+    # 1. Setup hierarchy as comment above
+    View = env['ir.ui.view']
+    View.with_context(_force_unlink=True, active_test=False).search([('website_id', '=', 1)]).unlink()
+    view_D = env.ref('portal.my_account_link')
+    view_A = env.ref('portal.message_thread')
+    # Change `inherit_id` so the module update will set it back to the XML value
+    view_D.write({'inherit_id': view_A.id, 'arch_db': view_D.arch_db.replace('o_logout_divider', 'discussion')})
+    # Trigger COW on view
+    view_B = env.ref('portal.user_dropdown')  # XML data
+    view_D.with_context(website_id=1).write({'name': 'D Website 1'})
+    view_B.with_context(website_id=1).write({'name': 'B Website 1'})
+    view_Dcow = view_D._get_specific_views()
+
+    # 2. Ensure setup is as expected
+    view_Bcow = view_B._get_specific_views()
+    assert view_Dcow.inherit_id == view_A, "Ensure test is setup as expected."
+    assert len(view_Bcow) == len(view_Dcow) == 1, "Ensure test is setup as expected (2)."
+    assert view_B != view_Bcow, "Security check to ensure `_get_specific_views` return what it should."
+
+    # 3. Upgrade the module
+    portal_module = env['ir.module.module'].search([('name', '=', 'portal')])
+    portal_module.button_immediate_upgrade()
+    env.reset()     # clear the set of environments
+    env = env()     # get an environment that refers to the new registry
+
+    # 4. Ensure cow view also got its inherit_id updated
+    assert view_D.inherit_id == view_B, "Generic view security check."
+    assert view_Dcow.inherit_id == view_Bcow, "COW view should also have received the `inherit_id` update."