diff --git a/addons/web/static/tests/helpers/test_env.js b/addons/web/static/tests/helpers/test_env.js
index 5b197451517..5a3256e98fd 100644
--- a/addons/web/static/tests/helpers/test_env.js
+++ b/addons/web/static/tests/helpers/test_env.js
@@ -1,10 +1,8 @@
 odoo.define('web.test_env', async function (require) {
     "use strict";
 
-    const AbstractStorageService = require('web.AbstractStorageService');
-    const Bus = require("web.Bus");
-    const RamStorage = require('web.RamStorage');
-    const { buildQuery } = require("web.rpc");
+    const Bus = require('web.Bus');
+    const { buildQuery } = require('web.rpc');
     const session = require('web.session');
 
     /**
@@ -17,9 +15,6 @@ odoo.define('web.test_env', async function (require) {
      * @returns {Proxy}
      */
     function makeTestEnvironment(env = {}, providedRPC = null) {
-        const RamStorageService = AbstractStorageService.extend({
-            storage: new RamStorage(),
-        });
         const database = {
             parameters: {
                 code: "en_US",
@@ -31,33 +26,26 @@ odoo.define('web.test_env', async function (require) {
                 time_format: '%H:%M:%S',
             },
         };
-        let testEnv = {};
         const defaultEnv = {
             _t: env._t || Object.assign((s => s), { database }),
-            bus: new Bus(),
+            bus: env.bus || new Bus(),
             device: Object.assign({ isMobile: false }, env.device),
             isDebug: env.isDebug || (() => false),
             qweb: new owl.QWeb({ templates: session.owlTemplates }),
             services: Object.assign({
-                ajax: { // for legacy subwidgets
+                ajax: {
                     rpc() {
-                        const prom = testEnv.session.rpc(...arguments);
-                        prom.abort = function () {
-                            throw new Error("Can't abort this request");
-                        };
-                        return prom;
-                    },
+                      return env.session.rpc(...arguments); // Compatibility Legacy Widgets
+                    }
                 },
-                getCookie() { },
-                httpRequest() {
+                getCookie() {},
+                httpRequest(/* route, params = {}, readMethod = 'json' */) {
                     return Promise.resolve('');
                 },
                 rpc(params, options) {
                     const query = buildQuery(params);
-                    return testEnv.session.rpc(query.route, query.params, options);
+                    return env.session.rpc(query.route, query.params, options);
                 },
-                local_storage: new RamStorageService(),
-                session_storage: new RamStorageService(),
                 notification: { notify() { } },
             }, env.services),
             session: Object.assign({
@@ -67,10 +55,10 @@ odoo.define('web.test_env', async function (require) {
                     }
                     throw new Error(`No method to perform RPC`);
                 },
+                url: session.url,
             }, env.session),
         };
-        testEnv = Object.assign(env, defaultEnv);
-        return testEnv;
+        return Object.assign(env, defaultEnv);
     }
 
     /**
diff --git a/addons/web/static/tests/helpers/test_utils.js b/addons/web/static/tests/helpers/test_utils.js
index f6114b84fcd..1a1f38f7f09 100644
--- a/addons/web/static/tests/helpers/test_utils.js
+++ b/addons/web/static/tests/helpers/test_utils.js
@@ -121,7 +121,7 @@ odoo.define('web.test_utils', async function (require) {
     return {
         mock: {
             addMockEnvironment: testUtilsMock.addMockEnvironment,
-            getMockedOwlEnv: testUtilsMock.getMockedOwlEnv,
+            addMockEnvironmentOwl: testUtilsMock.addMockEnvironmentOwl,
             intercept: testUtilsMock.intercept,
             patch: testUtilsMock.patch,
             patchDate: testUtilsMock.patchDate,
diff --git a/addons/web/static/tests/helpers/test_utils_create.js b/addons/web/static/tests/helpers/test_utils_create.js
index 494a0aa2436..801120bf64b 100644
--- a/addons/web/static/tests/helpers/test_utils_create.js
+++ b/addons/web/static/tests/helpers/test_utils_create.js
@@ -67,7 +67,6 @@ odoo.define('web.test_utils_create', function (require) {
         }
 
         params.server = mockServer;
-        Component.env = testUtilsMock.getMockedOwlEnv(params);
 
         const userContext = params.context && params.context.user_context || {};
         const actionManager = new ActionManager(widget, userContext);
@@ -142,7 +141,7 @@ odoo.define('web.test_utils_create', function (require) {
         if (!(constructor.prototype instanceof Component)) {
             throw new Error(`Argument "constructor" must be an Owl Component.`);
         }
-        const env = Object.assign(testUtilsMock.getMockedOwlEnv(params), params.env);
+        const cleanUp = await testUtilsMock.addMockEnvironmentOwl(Component, params);
         class Parent extends Component {
             constructor() {
                 super(...arguments);
@@ -154,7 +153,6 @@ odoo.define('web.test_utils_create', function (require) {
                 }
             }
         }
-        Parent.env = env;
         Parent.template = xml`<t t-component="Component" t-props="state" t-ref="component"/>`;
         const parent = new Parent();
         await parent.mount(prepareTarget(params.debug), { position: 'first-child' });
@@ -162,6 +160,7 @@ odoo.define('web.test_utils_create', function (require) {
         const originalDestroy = child.destroy;
         child.destroy = function () {
             child.destroy = originalDestroy;
+            cleanUp();
             parent.destroy();
         };
         return child;
@@ -241,9 +240,9 @@ odoo.define('web.test_utils_create', function (require) {
      * mock method, assuming that the user has access rights, and is an admin.
      *
      * @param {Object} [params={}]
-     * @returns {DebugManager}
+     * @returns {Promise<DebugManager>}
      */
-    function createDebugManager(params = {}) {
+    async function createDebugManager(params = {}) {
         const mockRPC = params.mockRPC;
         Object.assign(params, {
             async mockRPC(route, args) {
@@ -268,7 +267,7 @@ odoo.define('web.test_utils_create', function (require) {
             },
         });
         const debugManager = new DebugManager();
-        testUtilsMock.addMockEnvironment(debugManager, params);
+        await testUtilsMock.addMockEnvironment(debugManager, params);
         return debugManager;
     }
 
@@ -280,12 +279,12 @@ odoo.define('web.test_utils_create', function (require) {
      * @param {Class} params.Model the model class to use
      * @returns {Model}
      */
-    function createModel(params) {
+    async function createModel(params) {
         const widget = new Widget();
 
         const model = new params.Model(widget);
 
-        testUtilsMock.addMockEnvironment(widget, params);
+        await testUtilsMock.addMockEnvironment(widget, params);
 
         // override the model's 'destroy' so that it calls 'destroy' on the widget
         // instead, as the widget is the parent of the model and the mockServer.
@@ -304,11 +303,11 @@ odoo.define('web.test_utils_create', function (require) {
      *
      * @param {Object} params This object will be given to addMockEnvironment, so
      *   any parameters from that method applies
-     * @returns {Widget}
+     * @returns {Promise<Widget>}
      */
-    function createParent(params) {
+    async function createParent(params) {
         const widget = new Widget();
-        testUtilsMock.addMockEnvironment(widget, params);
+        await testUtilsMock.addMockEnvironment(widget, params);
         return widget;
     }
 
@@ -358,8 +357,6 @@ odoo.define('web.test_utils_create', function (require) {
         const viewInfo = testUtilsMock.fieldsViewGet(mockServer, params);
 
         params.server = mockServer;
-        const env = Object.assign(testUtilsMock.getMockedOwlEnv(params));
-        Component.env = env;
 
         // create the view
         const View = params.View;
diff --git a/addons/web/static/tests/helpers/test_utils_mock.js b/addons/web/static/tests/helpers/test_utils_mock.js
index 414a9c0df64..6df49cf59f3 100644
--- a/addons/web/static/tests/helpers/test_utils_mock.js
+++ b/addons/web/static/tests/helpers/test_utils_mock.js
@@ -10,12 +10,16 @@ odoo.define('web.test_utils_mock', function (require) {
  * testUtils file.
  */
 
+const AbstractStorageService = require('web.AbstractStorageService');
+const AjaxService = require('web.AjaxService');
 const basic_fields = require('web.basic_fields');
+const Bus = require('web.Bus');
 const config = require('web.config');
 const core = require('web.core');
 const dom = require('web.dom');
 const makeTestEnvironment = require('web.test_env');
 const MockServer = require('web.MockServer');
+const RamStorage = require('web.RamStorage');
 const session = require('web.session');
 
 const DebouncedField = basic_fields.DebouncedField;
@@ -25,6 +29,199 @@ const DebouncedField = basic_fields.DebouncedField;
 // Private functions
 //------------------------------------------------------------------------------
 
+/**
+ * Returns a mocked environment to be used by OWL components in tests, with
+ * requested services (+ ajax, local_storage and session_storage) deployed.
+ *
+ * @private
+ * @param {Object} params
+ * @param {Bus} [params.bus]
+ * @param {boolean} [params.debug]
+ * @param {Object} [params.env]
+ * @param {Bus} [params.env.bus]
+ * @param {Object} [params.env.dataManager]
+ * @param {Object} [params.env.services]
+ * @param {Object[]} [params.favoriteFilters]
+ * @param {Object} [params.services]
+ * @param {Object} [params.session]
+ * @param {MockServer} [mockServer]
+ * @returns {Promise<Object>} env
+ */
+async function _getMockedOwlEnv(params, mockServer) {
+    params.env = params.env || {};
+
+    // build the env
+    const favoriteFilters = params.favoriteFilters;
+    const debug = params.debug;
+    const services = {};
+    const env = Object.assign({}, params.env, {
+        bus: params.bus || params.env.bus || new Bus(),
+        dataManager: Object.assign({
+            load_action: (actionID, context) => {
+                return mockServer.performRpc('/web/action/load', {
+                    action_id: actionID,
+                    additional_context: context,
+                });
+            },
+            load_views: (params, options) => {
+                return mockServer.performRpc('/web/dataset/call_kw/' + params.model, {
+                    args: [],
+                    kwargs: {
+                        context: params.context,
+                        options: options,
+                        views: params.views_descr,
+                    },
+                    method: 'load_views',
+                    model: params.model,
+                }).then(function (views) {
+                    views = _.mapObject(views, viewParams => {
+                        return fieldsViewGet(mockServer, viewParams);
+                    });
+                    if (favoriteFilters && 'search' in views) {
+                        views.search.favoriteFilters = favoriteFilters;
+                    }
+                    return views;
+                });
+            },
+            load_filters: params => {
+                if (debug) {
+                    console.log('[mock] load_filters', params);
+                }
+                return Promise.resolve([]);
+            },
+        }, params.env.dataManager),
+        services: Object.assign(services, params.env.services),
+        session: params.session || {},
+    });
+
+    // deploy services into the env
+    // determine services to instantiate (classes), and already register function services
+    const servicesToDeploy = {};
+    for (const name in params.services || {}) {
+        const Service = params.services[name];
+        if (Service.constructor.name === 'Class') {
+            servicesToDeploy[name] = Service;
+        } else {
+            services[name] = Service;
+        }
+    }
+    // always deploy ajax, local storage and session storage
+    if (!servicesToDeploy.ajax) {
+        const MockedAjaxService = AjaxService.extend({
+            rpc: mockServer.performRpc.bind(mockServer),
+        });
+        services.ajax = new MockedAjaxService(env);
+    }
+    const RamStorageService = AbstractStorageService.extend({
+        storage: new RamStorage(),
+    });
+    if (!servicesToDeploy.local_storage) {
+        services.local_storage = new RamStorageService(env);
+    }
+    if (!servicesToDeploy.session_storage) {
+        services.session_storage = new RamStorageService(env);
+    }
+    // deploy other requested services
+    let done = false;
+    while (!done) {
+        const serviceName = Object.keys(servicesToDeploy).find(serviceName => {
+            const Service = servicesToDeploy[serviceName];
+            return Service.prototype.dependencies.every(depName => {
+                return env.services[depName];
+            });
+        });
+        if (serviceName) {
+            const Service = servicesToDeploy[serviceName];
+            services[serviceName] = new Service(env);
+            delete servicesToDeploy[serviceName];
+            services[serviceName].start();
+        } else {
+            const serviceNames = _.keys(servicesToDeploy);
+            if (serviceNames.length) {
+                console.warn("Non loaded services:", serviceNames);
+            }
+            done = true;
+        }
+    }
+    // wait for asynchronous services to properly start
+    await new Promise(setTimeout);
+
+    return env;
+}
+/**
+ * This function is used to mock global objects (session, config...) in tests.
+ * It is necessary for legacy widgets. It returns a cleanUp function to call at
+ * the end of the test.
+ *
+ * The function could be removed as soon as we do not support legacy widgets
+ * anymore.
+ *
+ * @private
+ * @param {Object} params
+ * @param {Object} [params.config] if given, it is used to extend the global
+ *   config,
+ * @param {Object} [params.session] if given, it is used to extend the current,
+ *   real session.
+ * @param {Object} [params.translateParameters] if given, it will be used to
+ *   extend the core._t.database.parameters object.
+ * @returns {function} a cleanUp function to restore everything, to call at the
+ *   end of the test
+ */
+function _mockGlobalObjects(params) {
+    // patch session
+    let initialSession = Object.assign({}, session);
+    session.getTZOffset = function () {
+        return 0; // by default, but may be overridden in specific tests
+    };
+    if ('session' in params) {
+        Object.assign(session, params.session);
+    }
+
+    // patch config
+    let initialConfig;
+    if ('config' in params) {
+        initialConfig = Object.assign({}, config);
+        initialConfig.device = Object.assign({}, config.device);
+        if ('device' in params.config) {
+            Object.assign(config.device, params.config.device);
+        }
+        if ('debug' in params.config) {
+            odoo.debug = params.config.debug;
+        }
+    }
+
+    // patch translate params
+    let initialParameters;
+    if ('translateParameters' in params) {
+        initialParameters = Object.assign({}, core._t.database.parameters);
+        Object.assign(core._t.database.parameters, params.translateParameters);
+    }
+
+    // build the cleanUp function to restore everything at the end of the test
+    function cleanUp() {
+        let key;
+        if ('session' in params) {
+            for (key in session) {
+                delete session[key];
+            }
+        }
+        Object.assign(session, initialSession);
+        if ('config' in params) {
+            for (key in config) {
+                delete config[key];
+            }
+            _.extend(config, initialConfig);
+        }
+        if ('translateParameters' in params) {
+            for (key in core._t.database.parameters) {
+                delete core._t.database.parameters[key];
+            }
+            _.extend(core._t.database.parameters, initialParameters);
+        }
+    }
+
+    return cleanUp;
+}
 /**
  * logs all event going through the target widget.
  *
@@ -42,16 +239,58 @@ function _observe(widget) {
 // Public functions
 //------------------------------------------------------------------------------
 
+/**
+ * performs a fields_view_get, and mocks the postprocessing done by the
+ * data_manager to return an equivalent structure.
+ *
+ * @param {MockServer} server
+ * @param {Object} params
+ * @param {string} params.model
+ * @returns {Object} an object with 3 keys: arch, fields and viewFields
+ */
+function fieldsViewGet(server, params) {
+    var fieldsView = server.fieldsViewGet(params);
+    // mock the structure produced by the DataManager
+    fieldsView.viewFields = fieldsView.fields;
+    fieldsView.fields = server.fieldsGet(params.model);
+    return fieldsView;
+}
+
+/**
+ * intercepts an event bubbling up the widget hierarchy. The event intercepted
+ * must be a "custom event", i.e. an event generated by the method 'trigger_up'.
+ *
+ * Note that this method really intercepts the event if @propagate is not set.
+ * It will not be propagated further, and even the handlers on the target will
+ * not fire.
+ *
+ * @param {Widget} widget the target widget (any Odoo widget)
+ * @param {string} eventName description of the event
+ * @param {function} fn callback executed when the even is intercepted
+ * @param {boolean} [propagate=false]
+ */
+function intercept(widget, eventName, fn, propagate) {
+    var _trigger_up = widget._trigger_up.bind(widget);
+    widget._trigger_up = function (event) {
+        if (event.name === eventName) {
+            fn(event);
+            if (!propagate) { return; }
+        }
+        _trigger_up(event);
+    };
+}
+
 /**
  * Removes the src attribute on images and iframes to prevent not found errors,
  * and optionally triggers an rpc with the src url as route on a widget.
  * This method is critical and must be fastest (=> no jQuery, no underscore)
  *
  * @param {HTMLElement} el
- * @param {[Widget]} widget the widget on which the rpc should be performed
+ * @param {[function]} rpc
  */
-function removeSrcAttribute(el, widget) {
+function removeSrcAttribute(el, rpc) {
     var nodes;
+    el = el.nodeType === 8 ? el.nextSibling : el;
     if (el.nodeName === 'IMG' || el.nodeName === 'IFRAME') {
         nodes = [el];
     } else {
@@ -68,14 +307,135 @@ function removeSrcAttribute(el, widget) {
             } else {
                 node.setAttribute('src', 'about:blank');
             }
-            if (widget) {
-                widget._rpc({ route: src });
+            if (rpc) {
+                rpc(src, []);
             }
             $(node).trigger('load');
         }
     }
 }
 
+/**
+ * Add a mock environment to test Owl Components. This function generates a test
+ * env and sets it on the given Component. It also has several side effects,
+ * like patching the global session or config objects. It returns a cleanup
+ * function to call at the end of the test.
+ *
+ * @param {Component} Component
+ * @param {Object} [params]
+ * @param {Object} [params.actions]
+ * @param {Object} [params.archs]
+ * @param {string} [params.currentDate]
+ * @param {Object} [params.data]
+ * @param {boolean} [params.debug]
+ * @param {function} [params.mockRPC]
+ * @param {number} [params.fieldDebounce=0] the value of the DEBOUNCE attribute
+ *   of fields
+ * @param {boolean} [params.debounce=true] if false, patch _.debounce to remove
+ *   its behavior
+ * @param {boolean} [params.throttle=false] by default, _.throttle is patched to
+ *   remove its behavior, except if this params is set to true
+ * @param {boolean} [params.mockSRC=false] if true, redirect src GET requests to
+ *   the mockServer
+ * @param {MockServer} [mockServer]
+ * @returns {Promise<function>} the cleanup function
+ */
+async function addMockEnvironmentOwl(Component, params, mockServer) {
+    params = params || {};
+
+    // instantiate a mockServer if not provided
+    if (!mockServer) {
+        let Server = MockServer;
+        if (params.mockRPC) {
+            Server = MockServer.extend({ _performRpc: params.mockRPC });
+        }
+        mockServer = new Server(params.data, {
+            actions: params.actions,
+            archs: params.archs,
+            currentDate: params.currentDate,
+            debug: params.debug,
+        });
+    }
+
+    // make sure the debounce value for input fields is set to 0
+    const initialDebounceValue = DebouncedField.prototype.DEBOUNCE;
+    DebouncedField.prototype.DEBOUNCE = params.fieldDebounce || 0;
+    const initialDOMDebounceValue = dom.DEBOUNCE;
+    dom.DEBOUNCE = 0;
+
+    // patch underscore debounce/throttle functions
+    const initialDebounce = _.debounce;
+    if (params.debounce === false) {
+        _.debounce = function (func) {
+            return func;
+        };
+    }
+    // fixme: throttle is inactive by default, should we make it explicit ?
+    const initialThrottle = _.throttle;
+    if (!('throttle' in params) || !params.throttle) {
+        _.throttle = function (func) {
+            return func;
+        };
+    }
+
+    // make sure images do not trigger a GET on the server
+    $('body').on('DOMNodeInserted.removeSRC', function (ev) {
+        let rpc;
+        if (params.mockSRC) {
+            rpc = mockServer.performRpc.bind(mockServer);
+        }
+        removeSrcAttribute(ev.target, rpc);
+    });
+
+    // mock global objects for legacy widgets (session, config...)
+    const restoreMockedGlobalObjects = _mockGlobalObjects(params);
+
+    // set the test env on owl Component
+    const env = await _getMockedOwlEnv(params, mockServer);
+    const originalEnv = Component.env;
+    Component.env = makeTestEnvironment(env, mockServer.performRpc.bind(mockServer));
+
+    // while we have a mix between Owl and legacy stuff, some of them triggering
+    // events on the env.bus (a new Bus instance especially created for the current
+    // test), the others using core.bus, we have to ensure that events triggered
+    // on env.bus are also triggered on core.bus (note that outside the testing
+    // environment, both are the exact same instance of Bus)
+    const envBusTrigger = env.bus.trigger;
+    env.bus.trigger = function () {
+        core.bus.trigger(...arguments);
+        envBusTrigger.call(env.bus, ...arguments);
+    };
+
+    // build the clean up function to call at the end of the test
+    function cleanUp() {
+        env.bus.destroy();
+        Object.keys(env.services).forEach(function (s) {
+            var service = env.services[s];
+            if (service.destroy && !service.isDestroyed()) {
+                service.destroy();
+            }
+        });
+
+        DebouncedField.prototype.DEBOUNCE = initialDebounceValue;
+        dom.DEBOUNCE = initialDOMDebounceValue;
+        _.debounce = initialDebounce;
+        _.throttle = initialThrottle;
+
+        // clear the caches (e.g. data_manager, ModelFieldSelector) at the end
+        // of each test to avoid collisions
+        core.bus.trigger('clear_cache');
+
+        $('body').off('DOMNodeInserted.removeSRC');
+        $('.blockUI').remove(); // fixme: move to qunit_config in OdooAfterTestHook?
+
+        restoreMockedGlobalObjects();
+
+        Component.env = originalEnv;
+    }
+
+    return cleanUp;
+}
+
 /**
  * Add a mock environment to a widget.  This helper function can simulate
  * various kind of side effects, such as mocking RPCs, changing the session,
@@ -100,6 +460,7 @@ function removeSrcAttribute(el, widget) {
  *   used to generate mock answers for every kind of routes supported by odoo
  * @param {number} [params.debug] if set to true, logs RPCs and uncaught Odoo
  *   events.
+ * @param {Object} [params.bus] the instance of Bus that will be used (in the env)
  * @param {function} [params.mockRPC] a function that will be used to override
  *   the _performRpc method from the mock server. It is really useful to add
  *   some custom rpc mocks, or to check some assertions.
@@ -130,11 +491,7 @@ function removeSrcAttribute(el, widget) {
  *   other methods on it.
  */
 async function addMockEnvironment(widget, params) {
-    var Server = MockServer;
-    params.services = params.services || {};
-    if (params.mockRPC) {
-        Server = MockServer.extend({ _performRpc: params.mockRPC });
-    }
+    // log events triggered up if debug flag is true
     if (params.debug) {
         _observe(widget);
         var separator = window.location.href.indexOf('?') !== -1 ? "&" : "?";
@@ -142,6 +499,11 @@ async function addMockEnvironment(widget, params) {
         console.log('%c[debug] debug mode activated', 'color: blue; font-weight: bold;', url);
     }
 
+    // instantiate mock server
+    var Server = MockServer;
+    if (params.mockRPC) {
+        Server = MockServer.extend({ _performRpc: params.mockRPC });
+    }
     var mockServer = new Server(params.data, {
         actions: params.actions,
         archs: params.archs,
@@ -150,310 +512,60 @@ async function addMockEnvironment(widget, params) {
         widget: widget,
     });
 
-    // make sure images do not trigger a GET on the server
-    $('body').on('DOMNodeInserted.removeSRC', function (event) {
-        removeSrcAttribute(event.target, widget);
-    });
+    // build and set the Owl env on Component
+    if (!('mockSRC' in params)) { // redirect src rpcs to the mock server
+        params.mockSRC = true;
+    }
+    const cleanUp = await addMockEnvironmentOwl(owl.Component, params, mockServer);
+    const env = owl.Component.env;
 
-    // make sure the debounce value for input fields is set to 0
-    var initialDebounceValue = DebouncedField.prototype.DEBOUNCE;
-    DebouncedField.prototype.DEBOUNCE = params.fieldDebounce || 0;
-    var initialDOMDebounceValue = dom.DEBOUNCE;
-    dom.DEBOUNCE = 0;
-    var initialSession, initialConfig, initialParameters, initialDebounce, initialThrottle;
-    initialSession = _.extend({}, session);
-    session.getTZOffset = function () {
-        return 0; // by default, but may be overridden in specific tests
-    };
-    if ('session' in params) {
-        _.extend(session, params.session);
-    }
-    if ('config' in params) {
-        initialConfig = _.clone(config);
-        initialConfig.device = _.clone(config.device);
-        if ('device' in params.config) {
-            _.extend(config.device, params.config.device);
-        }
-        if ('debug' in params.config) {
-            odoo.debug = params.config.debug;
-        }
-    }
-    if ('translateParameters' in params) {
-        initialParameters = _.extend({}, core._t.database.parameters);
-        _.extend(core._t.database.parameters, params.translateParameters);
-    }
-    if (params.debounce === false) {
-        initialDebounce = _.debounce;
-        _.debounce = function (func) {
-            return func;
-        };
-    }
-    if (!('throttle' in params) || !params.throttle) {
-        initialThrottle = _.throttle;
-        _.throttle = function (func) {
-            return func;
-        };
-    }
-
-    var widgetDestroy = widget.destroy;
+    // ensure to clean up everything when the widget will be destroyed
+    const destroy = widget.destroy;
     widget.destroy = function () {
-        // clear the caches (e.g. data_manager, ModelFieldSelector) when the
-        // widget is destroyed, at the end of each test to avoid collisions
-        core.bus.trigger('clear_cache');
-
-        Object.keys(services).forEach(function(s) {
-            var service = services[s];
-            if (service && !service.isDestroyed())
-                service.destroy();
-        });
-
-        DebouncedField.prototype.DEBOUNCE = initialDebounceValue;
-        dom.DEBOUNCE = initialDOMDebounceValue;
-        if (params.debounce === false) {
-            _.debounce = initialDebounce;
-        }
-        if (!('throttle' in params) || !params.throttle) {
-            _.throttle = initialThrottle;
-        }
-
-        var key;
-        if ('session' in params) {
-            for (key in session) {
-                delete session[key];
-            }
-        }
-        _.extend(session, initialSession);
-        if ('config' in params) {
-            for (key in config) {
-                delete config[key];
-            }
-            _.extend(config, initialConfig);
-        }
-        if ('translateParameters' in params) {
-            for (key in core._t.database.parameters) {
-                delete core._t.database.parameters[key];
-            }
-            _.extend(core._t.database.parameters, initialParameters);
-        }
-
-        $('body').off('DOMNodeInserted.removeSRC');
-        $('body').removeClass('debug');
-        $('.blockUI').remove();
-
-        widgetDestroy.call(this);
+        cleanUp();
+        destroy.call(this, ...arguments);
     };
 
-    // Dispatch service calls
-    // Note: some services could call other services at init,
-    // Which is why we have to init services after that
-    var services = {};
+    // intercept service/data manager calls and redirect them to the env
     intercept(widget, 'call_service', function (ev) {
-        var args, result;
-        if (services[ev.data.service]) {
-            var service = services[ev.data.service];
-            args = (ev.data.args || []);
-            result = service[ev.data.method].apply(service, args);
-        } else if (ev.data.service === 'ajax' && ev.data.method === 'rpc') {
-            // use ajax service that is mocked by the server
-            var route = ev.data.args[0];
-            args = ev.data.args[1];
-            result = mockServer.performRpc(route, args);
+        if (env.services[ev.data.service]) {
+            var service = env.services[ev.data.service];
+            const result = service[ev.data.method].apply(service, ev.data.args || []);
+            ev.data.callback(result);
         }
-        ev.data.callback(result);
     });
-
-    intercept(widget, 'load_action', function (event) {
-        mockServer.performRpc('/web/action/load', {
-            action_id: event.data.actionID,
-            additional_context: event.data.context,
-        }).then(function (action) {
-            event.data.on_success(action);
-        });
+    intercept(widget, 'load_action', async ev => {
+        const action = await env.dataManager.load_action(ev.data.actionID, ev.data.context);
+        ev.data.on_success(action);
     });
-
-    intercept(widget, "load_views", function (event) {
-        mockServer.performRpc('/web/dataset/call_kw/' + event.data.modelName, {
-            args: [],
-            kwargs: {
-                context: event.data.context,
-                options: event.data.options,
-                views: event.data.views,
-            },
-            method: 'load_views',
-            model: event.data.modelName,
-        }).then(function (views) {
-            views = _.mapObject(views, function (viewParams) {
-                return fieldsViewGet(mockServer, viewParams);
-            });
-            if ('search' in views && params.favoriteFilters) {
-                views.search.favoriteFilters = params.favoriteFilters;
-            }
-            event.data.on_success(views);
-        });
-    });
-
-    intercept(widget, "get_session", function (event) {
-        event.data.callback(session);
-    });
-
-    intercept(widget, "load_filters", function (event) {
-        if (params.debug) {
-            console.log('[mock] load_filters', event.data);
+    intercept(widget, "load_views", async ev => {
+        const params = {
+            model: ev.data.modelName,
+            context: ev.data.context,
+            views_descr: ev.data.views,
+        };
+        const views = await env.dataManager.load_views(params, ev.data.options);
+        if ('search' in views && params.favoriteFilters) {
+            views.search.favoriteFilters = params.favoriteFilters;
         }
-        event.data.on_success([]);
+        ev.data.on_success(views);
+    });
+    intercept(widget, "get_session", ev => {
+        ev.data.callback(session);
+    });
+    intercept(widget, "load_filters", async ev => {
+        const filters = await env.dataManager.load_filters(ev.data);
+        ev.data.on_success(filters);
     });
 
-    // make sure all Odoo events bubbling up are intercepted
-    if ('intercepts' in params) {
-        _.each(params.intercepts, function (cb, name) {
-            intercept(widget, name, cb);
-        });
-    }
-
-    // Deploy services
-    var done = false;
-    var servicesToDeploy = _.clone(params.services);
-    if (!servicesToDeploy.ajax) {
-        services.ajax = null; // use mocked ajax from mocked server
-    }
-    while (!done) {
-        var serviceName = _.findKey(servicesToDeploy, function (Service) {
-            return !_.some(Service.prototype.dependencies, function (depName) {
-                return !_.has(services, depName);
-            });
-        });
-        if (serviceName) {
-            var Service = servicesToDeploy[serviceName];
-            var service = services[serviceName] = new Service(widget);
-            delete servicesToDeploy[serviceName];
-
-            intercept(service, "get_session", function (event) {
-                event.data.callback(session);
-            });
-            service.start();
-        } else {
-            var serviceNames = _.keys(servicesToDeploy);
-            if (serviceNames.length) {
-                console.warn("Non loaded services:", serviceNames);
-            }
-            done = true;
-        }
-    }
-
-    // Wait for asynchronous services to properly start
-    await new Promise(setTimeout);
+    // make sure all other Odoo events bubbling up are intercepted
+    Object.keys(params.intercepts || {}).forEach(function (name) {
+        intercept(widget, name, params.intercepts[name]);
+    });
 
     return mockServer;
 }
 
-/**
- * performs a fields_view_get, and mocks the postprocessing done by the
- * data_manager to return an equivalent structure.
- *
- * @param {MockServer} server
- * @param {Object} params
- * @param {string} params.model
- * @returns {Object} an object with 3 keys: arch, fields and viewFields
- */
-function fieldsViewGet(server, params) {
-    var fieldsView = server.fieldsViewGet(params);
-    // mock the structure produced by the DataManager
-    fieldsView.viewFields = fieldsView.fields;
-    fieldsView.fields = server.fieldsGet(params.model);
-    return fieldsView;
-}
-
-/**
- * Returns a mocked environment to be used by OWL components in tests.
- *
- * @param {Object} [params]
- * @param {Object} [params.actions] the actions given to the mock server
- * @param {Object} [params.archs] this archs given to the mock server
- * @param {Object} [params.data] the business data given to the mock server
- * @param {boolean} [params.debug]
- * @param {Object} [params.env]
- * @param {function} [params.mockRPC]
- * @param {function} [params.server] an already instantiated server to avoid
- *      creating another one.
- * @returns {Object}
- */
-function getMockedOwlEnv(params = {}) {
-    let server;
-    if (params.server) {
-        server = params.server;
-    } else {
-        let Server = MockServer;
-        if (params.mockRPC) {
-            Server = MockServer.extend({ _performRpc: params.mockRPC });
-        }
-        server = new Server(params.data, {
-            actions: params.actions,
-            archs: params.archs,
-            debug: params.debug,
-        });
-    }
-    const env = Object.assign({
-        dataManager: {
-            load_action: (actionID, context) => {
-                return server.performRpc('/web/action/load', {
-                    kwargs: {
-                        action_id: actionID,
-                        additional_context: context,
-                    },
-                });
-            },
-            load_views: (params, options) => {
-                return server.performRpc('/web/dataset/call_kw/' + params.model, {
-                    args: [],
-                    kwargs: {
-                        context: params.context,
-                        options: options,
-                        views: params.views_descr,
-                    },
-                    method: 'load_views',
-                    model: params.model,
-                }).then(function (views) {
-                    return _.mapObject(views, viewParams => {
-                        return fieldsViewGet(server, viewParams);
-                    });
-                });
-            },
-            load_filters: params => {
-                if (params.debug) {
-                    console.log('[mock] load_filters', params);
-                }
-                return Promise.resolve([]);
-            },
-        },
-        session: params.session || {},
-    }, params.env);
-    return makeTestEnvironment(env, server.performRpc.bind(server));
-}
-
-/**
- * intercepts an event bubbling up the widget hierarchy. The event intercepted
- * must be a "custom event", i.e. an event generated by the method 'trigger_up'.
- *
- * Note that this method really intercepts the event if @propagate is not set.
- * It will not be propagated further, and even the handlers on the target will
- * not fire.
- *
- * @param {Widget} widget the target widget (any Odoo widget)
- * @param {string} eventName description of the event
- * @param {function} fn callback executed when the even is intercepted
- * @param {boolean} [propagate=false]
- */
-function intercept(widget, eventName, fn, propagate) {
-    var _trigger_up = widget._trigger_up.bind(widget);
-    widget._trigger_up = function (event) {
-        if (event.name === eventName) {
-            fn(event);
-            if (!propagate) { return; }
-        }
-        _trigger_up(event);
-    };
-}
-
 /**
  * Patch window.Date so that the time starts its flow from the provided Date.
  *
@@ -644,7 +756,7 @@ function patchSetTimeout() {
 return {
     addMockEnvironment: addMockEnvironment,
     fieldsViewGet: fieldsViewGet,
-    getMockedOwlEnv: getMockedOwlEnv,
+    addMockEnvironmentOwl: addMockEnvironmentOwl,
     intercept: intercept,
     patchDate: patchDate,
     patch: patch,
diff --git a/addons/web/static/tests/owl_compatibility_tests.js b/addons/web/static/tests/owl_compatibility_tests.js
index f49fee5f78a..1cc463d0eeb 100644
--- a/addons/web/static/tests/owl_compatibility_tests.js
+++ b/addons/web/static/tests/owl_compatibility_tests.js
@@ -5,9 +5,9 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
     const testUtils = require('web.test_utils');
     const Widget = require('web.Widget');
 
-    const getMockedOwlEnv = testUtils.mock.getMockedOwlEnv;
     const makeTestPromise = testUtils.makeTestPromise;
     const nextTick = testUtils.nextTick;
+    const addMockEnvironmentOwl = testUtils.mock.addMockEnvironmentOwl;
 
     const { Component, tags, useState } = owl;
     const { xml } = tags;
@@ -448,17 +448,17 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
                     this.MyWidget = MyWidget;
                 }
             }
-            Parent.env = getMockedOwlEnv({
-                mockRPC: function (route, args) {
-                    assert.step(`${route} ${args.val}`);
-                    return Promise.resolve();
-                },
-            });
             Parent.template = xml`
                 <div>
                     <ComponentAdapter Component="MyWidget"/>
                 </div>`;
             Parent.components = { ComponentAdapter };
+            const cleanUp = await addMockEnvironmentOwl(Parent, {
+                mockRPC: function (route, args) {
+                    assert.step(`${route} ${args.val}`);
+                    return Promise.resolve();
+                },
+            });
 
             const target = testUtils.prepareTarget();
             const parent = new Parent();
@@ -468,6 +468,7 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
             assert.verifySteps(['some/route 2']);
 
             parent.destroy();
+            cleanUp();
         });
 
         QUnit.test("sub widget that calls a service", async function (assert) {
@@ -493,16 +494,14 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
                     this.MyWidget = MyWidget;
                 }
             }
-            const env = getMockedOwlEnv();
-            env.services.math = {
-                sqrt: v => Math.sqrt(v),
-            };
-            Parent.env = env;
             Parent.template = xml`
                 <div>
                     <ComponentAdapter Component="MyWidget"/>
                 </div>`;
             Parent.components = { ComponentAdapter };
+            Parent.env.services.math = {
+                sqrt: v => Math.sqrt(v),
+            };
 
             const target = testUtils.prepareTarget();
             const parent = new Parent();
@@ -525,20 +524,21 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
                     this.MyWidget = MyWidget;
                 }
             }
-            Parent.env = getMockedOwlEnv({
-                session: { key: 'value' },
-            });
             Parent.template = xml`
                 <div>
                     <ComponentAdapter Component="MyWidget"/>
                 </div>`;
             Parent.components = { ComponentAdapter };
+            const cleanUp = await addMockEnvironmentOwl(Parent, {
+                session: { key: 'value' },
+            });
 
             const target = testUtils.prepareTarget();
             const parent = new Parent();
             await parent.mount(target);
 
             parent.destroy();
+            cleanUp();
         });
 
         QUnit.test("sub widget that calls load_views", async function (assert) {
@@ -555,7 +555,12 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
                     this.MyWidget = MyWidget;
                 }
             }
-            Parent.env = getMockedOwlEnv({
+            Parent.template = xml`
+                <div>
+                    <ComponentAdapter Component="MyWidget"/>
+                </div>`;
+            Parent.components = { ComponentAdapter };
+            const cleanUp = await addMockEnvironmentOwl(Parent, {
                 mockRPC: function (route, args) {
                     assert.strictEqual(route, '/web/dataset/call_kw/some_model');
                     assert.deepEqual(args.kwargs.context, { x: 2 });
@@ -563,11 +568,6 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
                     return Promise.resolve();
                 },
             });
-            Parent.template = xml`
-                <div>
-                    <ComponentAdapter Component="MyWidget"/>
-                </div>`;
-            Parent.components = { ComponentAdapter };
 
             const target = testUtils.prepareTarget();
             const parent = new Parent();
@@ -576,6 +576,7 @@ odoo.define('web.OwlCompatibilityTests', function (require) {
             assert.strictEqual(parent.el.innerHTML, '<div></div>');
 
             parent.destroy();
+            cleanUp();
         });
 
         QUnit.test("sub widgets in a t-if/t-else", async function (assert) {
diff --git a/addons/web/static/tests/views/view_dialogs_tests.js b/addons/web/static/tests/views/view_dialogs_tests.js
index 26fc002605a..7d1554dc78d 100644
--- a/addons/web/static/tests/views/view_dialogs_tests.js
+++ b/addons/web/static/tests/views/view_dialogs_tests.js
@@ -12,8 +12,7 @@ var createView = testUtils.createView;
 
 async function createParent(params) {
     var widget = new Widget();
-    params.server =  await testUtils.mock.addMockEnvironment(widget, params);
-    owl.Component.env = testUtils.mock.getMockedOwlEnv(params);
+    params.server = await testUtils.mock.addMockEnvironment(widget, params);
     return widget;
 }