diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 2f7a8a4e237..83b59fc60a1 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1134,6 +1134,12 @@ class Database(http.Controller):
         try:
             dispatch_rpc('db','drop', [master_pwd, name])
             request._cr = None  # dropping a database leads to an unusable cursor
+            # if the user is connected to the dropped database, redirect will raise an operational error
+            # trying to access the registry of this database.
+            # Removing db from this request will prevent an invalid error message. (logout looks like a good idea in this case)
+            # https://github.com/odoo/odoo/pull/54102 is proposing a complete fix for this issue.
+            if request.session.db == name:
+                request.session.logout()
             return request.redirect('/web/database/manager')
         except Exception as e:
             error = "Database deletion error: %s" % (str(e) or repr(e))
diff --git a/addons/web/tests/__init__.py b/addons/web/tests/__init__.py
index 62810336e66..031e1b56852 100644
--- a/addons/web/tests/__init__.py
+++ b/addons/web/tests/__init__.py
@@ -1,5 +1,6 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
+from . import test_db_manager
 from . import test_health
 from . import test_image
 from . import test_js
diff --git a/addons/web/tests/test_db_manager.py b/addons/web/tests/test_db_manager.py
new file mode 100644
index 00000000000..0ff8512e12a
--- /dev/null
+++ b/addons/web/tests/test_db_manager.py
@@ -0,0 +1,121 @@
+# -*- encoding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import operator
+import re
+import secrets
+from unittest.mock import patch
+
+import requests
+
+import odoo
+from odoo.tests.common import BaseCase, HttpCase, tagged
+from odoo.tools import config
+
+
+class TestDatabaseManager(HttpCase):
+    def test_database_manager(self):
+        res = self.url_open('/web/database/manager')
+        self.assertEqual(res.status_code, 200)
+
+        # check that basic existing db actions are present
+        self.assertIn('.o_database_backup', res.text)
+        self.assertIn('.o_database_duplicate', res.text)
+        self.assertIn('.o_database_delete', res.text)
+
+        # check that basic db actions are present
+        self.assertIn('.o_database_create', res.text)
+        self.assertIn('.o_database_restore', res.text)
+
+
+@tagged('-at_install', 'post_install', '-standard', 'database_operations')
+class TestDatabaseOperations(BaseCase):
+    def setUp(self):
+        self.password = secrets.token_hex()
+
+        # monkey-patch password verification
+        self.verify_admin_password_patcher = patch(
+            'odoo.tools.config.verify_admin_password', self.password.__eq__,
+        )
+        self.verify_admin_password_patcher.start()
+        self.addCleanup(self.verify_admin_password_patcher.stop)
+
+        self.db_name = config['db_name']
+        self.assertTrue(self.db_name)
+
+        # monkey-patch db-filter
+        self.addCleanup(operator.setitem, config, 'dbfilter', config['dbfilter'])
+        config['dbfilter'] = self.db_name + '-.*'
+
+        self.base_databases = self.list_dbs()
+        self.session = requests.Session()
+        self.session.get(self.url('/web/database/manager'))
+
+    def tearDown(self):
+        self.assertEqual(
+            self.list_dbs(),
+            self.base_databases,
+            'No database should have been created or removed at the end of this test',
+        )
+
+    def list_dbs(self):
+        return set(odoo.service.db.list_dbs(True))
+
+    def list_dbs_filtered(self):
+        return set(db for db in self.list_dbs() if re.match(db, config['dbfilter']))
+
+    def url(self, path):
+        return HttpCase.base_url() + path
+
+    def assertDbs(self, dbs):
+        self.assertEqual(self.list_dbs() - self.base_databases, set(dbs))
+
+    def test_database_creation(self):
+        # check verify_admin_password patch
+        self.assertTrue(odoo.tools.config.verify_admin_password(self.password))
+
+        # create a database
+        test_db_name = self.db_name + '-test-database-creation'
+        self.assertNotIn(test_db_name, self.list_dbs_filtered())
+        res = self.session.post(self.url('/web/database/create'), data={
+            'master_pwd': self.password,
+            'name': test_db_name,
+            'login': 'admin',
+            'password': 'admin',
+            'lang': 'en_US',
+            'phone': '',
+        }, allow_redirects=False)
+        self.assertEqual(res.status_code, 303)
+        self.assertIn('/web', res.headers['Location'])
+        self.assertDbs([test_db_name])
+
+        # delete the created database
+        res = self.session.post(self.url('/web/database/drop'), data={
+            'master_pwd': self.password,
+            'name': test_db_name,
+        }, allow_redirects=False)
+        self.assertEqual(res.status_code, 303)
+        self.assertIn('/web/database/manager', res.headers['Location'])
+        self.assertDbs([])
+
+    def test_database_duplicate(self):
+        # duplicate this database
+        test_db_name = self.db_name + '-test-database-duplicate'
+        self.assertNotIn(test_db_name, self.list_dbs_filtered())
+        res = self.session.post(self.url('/web/database/duplicate'), data={
+            'master_pwd': self.password,
+            'name': self.db_name,
+            'new_name': test_db_name,
+        }, allow_redirects=False)
+        self.assertEqual(res.status_code, 303)
+        self.assertIn('/web/database/manager', res.headers['Location'])
+        self.assertDbs([test_db_name])
+
+        # delete the created database
+        res = self.session.post(self.url('/web/database/drop'), data={
+            'master_pwd': self.password,
+            'name': test_db_name,
+        }, allow_redirects=False)
+        self.assertEqual(res.status_code, 303)
+        self.assertIn('/web/database/manager', res.headers['Location'])
+        self.assertDbs([])