diff --git a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_canned_response_tests.js b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_canned_response_tests.js
index 35f0ed38df5..827899b0042 100644
--- a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_canned_response_tests.js
+++ b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_canned_response_tests.js
@@ -11,22 +11,20 @@ QUnit.test('canned response suggestion displayed', async function (assert) {
 
     const pyEnv = await startServer();
     const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
-    });
-    const cannedResponse = messaging.models['CannedResponse'].create({
-        id: 7,
+    pyEnv['mail.shortcode'].create({
         source: 'hello',
         substitution: "Hello, how are you?",
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'CannedResponse',
-        recordLocalId: cannedResponse.localId,
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', ":hello");
     assert.containsOnce(
         document.body,
         `.o_ComposerSuggestion`,
@@ -35,31 +33,24 @@ QUnit.test('canned response suggestion displayed', async function (assert) {
 });
 
 QUnit.test('canned response suggestion correct data', async function (assert) {
-    assert.expect(5);
+    assert.expect(4);
 
     const pyEnv = await startServer();
     const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
-    });
-    const cannedResponse = messaging.models['CannedResponse'].create({
-        id: 7,
+    pyEnv['mail.shortcode'].create({
         source: 'hello',
         substitution: "Hello, how are you?",
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'CannedResponse',
-        recordLocalId: cannedResponse.localId,
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-
-    assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Canned response suggestion should be present"
-    );
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', ":hello");
     assert.containsOnce(
         document.body,
         '.o_ComposerSuggestion_part1',
@@ -83,31 +74,24 @@ QUnit.test('canned response suggestion correct data', async function (assert) {
 });
 
 QUnit.test('canned response suggestion active', async function (assert) {
-    assert.expect(2);
+    assert.expect(1);
 
     const pyEnv = await startServer();
     const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
-    });
-    const cannedResponse = messaging.models['CannedResponse'].create({
-        id: 7,
+    pyEnv['mail.shortcode'].create({
         source: 'hello',
         substitution: "Hello, how are you?",
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'CannedResponse',
-        recordLocalId: cannedResponse.localId,
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-
-    assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Canned response suggestion should be displayed"
-    );
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', ":hello");
     assert.hasClass(
         document.querySelector('.o_ComposerSuggestion'),
         'active',
diff --git a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_channel_tests.js b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_channel_tests.js
index a3701002bac..4caba51ed8b 100644
--- a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_channel_tests.js
+++ b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_channel_tests.js
@@ -10,18 +10,17 @@ QUnit.test('channel mention suggestion displayed', async function (assert) {
     assert.expect(1);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
+    const mailChannelId1 = pyEnv['mail.channel'].create({ name: 'my-channel' });
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'Thread',
-        recordLocalId: thread.localId,
-    });
-
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "#my-channel");
     assert.containsOnce(
         document.body,
         `.o_ComposerSuggestion`,
@@ -30,26 +29,20 @@ QUnit.test('channel mention suggestion displayed', async function (assert) {
 });
 
 QUnit.test('channel mention suggestion correct data', async function (assert) {
-    assert.expect(3);
+    assert.expect(2);
 
     const pyEnv = await startServer();
     const mailChannelId1 = pyEnv['mail.channel'].create({ name: "General" });
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'Thread',
-        recordLocalId: thread.localId,
-    });
-
-    assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Channel mention suggestion should be present"
-    );
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "#General");
     assert.containsOnce(
         document.body,
         '.o_ComposerSuggestion_part1',
@@ -63,26 +56,20 @@ QUnit.test('channel mention suggestion correct data', async function (assert) {
 });
 
 QUnit.test('channel mention suggestion active', async function (assert) {
-    assert.expect(2);
+    assert.expect(1);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
+    const mailChannelId1 = pyEnv['mail.channel'].create({ name: 'my-channel' });
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'Thread',
-        recordLocalId: thread.localId,
-    });
-
-    assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Channel mention suggestion should be displayed"
-    );
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "#my-channel");
     assert.hasClass(
         document.querySelector('.o_ComposerSuggestion'),
         'active',
diff --git a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_command_tests.js b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_command_tests.js
index 0c540122677..623bca79db1 100644
--- a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_command_tests.js
+++ b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_command_tests.js
@@ -10,56 +10,39 @@ QUnit.test('command suggestion displayed', async function (assert) {
     assert.expect(1);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
+    const mailChannelId1 = pyEnv['mail.channel'].create({ name: 'my-channel' });
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-    const command = messaging.models['ChannelCommand'].create({
-        methodName: '',
-        name: 'whois',
-        help: "Displays who it is",
-    });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'ChannelCommand',
-        recordLocalId: command.localId,
-    });
-
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "/who");
     assert.containsOnce(
         document.body,
-        `.o_ComposerSuggestion`,
-        "Command suggestion should be present"
+        '.o_ComposerSuggestion',
+        "Command suggestion should be present",
     );
 });
 
 QUnit.test('command suggestion correct data', async function (assert) {
-    assert.expect(5);
+    assert.expect(4);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
+    const mailChannelId1 = pyEnv['mail.channel'].create({ name: 'my-channel' });
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-    const command = messaging.models['ChannelCommand'].create({
-        methodName: '',
-        name: 'whois',
-        help: "Displays who it is",
-    });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'ChannelCommand',
-        recordLocalId: command.localId,
-    });
-
-    assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Command suggestion should be present"
-    );
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "/who");
     assert.containsOnce(
         document.body,
         '.o_ComposerSuggestion_part1',
@@ -67,51 +50,40 @@ QUnit.test('command suggestion correct data', async function (assert) {
     );
     assert.strictEqual(
         document.querySelector(`.o_ComposerSuggestion_part1`).textContent,
-        "whois",
+        "who",
         "Command name should be displayed"
     );
     assert.containsOnce(
-        document.body,
+        document.querySelector('.o_ComposerSuggestion'),
         '.o_ComposerSuggestion_part2',
         "Command help should be present"
     );
     assert.strictEqual(
         document.querySelector(`.o_ComposerSuggestion_part2`).textContent,
-        "Displays who it is",
+        "List users in the current channel",
         "Command help should be displayed"
     );
 });
 
 QUnit.test('command suggestion active', async function (assert) {
-    assert.expect(2);
+    assert.expect(1);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
+    const mailChannelId1 = pyEnv['mail.channel'].create({ name: 'my-channel' });
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-    const command = messaging.models['ChannelCommand'].create({
-        methodName: '',
-        name: 'whois',
-        help: "Displays who it is",
-    });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'ChannelCommand',
-        recordLocalId: command.localId,
-    });
-
-    assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Command suggestion should be displayed"
-    );
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "/who");
     assert.hasClass(
         document.querySelector('.o_ComposerSuggestion'),
         'active',
-        "should be active initially"
+        "1st suggestion should be active initially"
     );
 });
 
diff --git a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_partner_tests.js b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_partner_tests.js
index 85f53a01425..7f317c1890b 100644
--- a/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_partner_tests.js
+++ b/addons/mail/static/tests/qunit_suite_tests/components/composer_suggestion_partner_tests.js
@@ -10,23 +10,22 @@ QUnit.test('partner mention suggestion displayed', async function (assert) {
     assert.expect(1);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
-    });
-    const partner = messaging.models['Partner'].create({
-        id: 7,
+    const mailChannelId1 = pyEnv['mail.channel'].create({});
+    pyEnv['res.partner'].create({
+        email: "demo_user@odoo.com",
         im_status: 'online',
-        name: "Demo User",
+        name: 'Demo User',
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'Partner',
-        recordLocalId: partner.localId,
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "@demo");
     assert.containsOnce(
         document.body,
         `.o_ComposerSuggestion`,
@@ -35,35 +34,28 @@ QUnit.test('partner mention suggestion displayed', async function (assert) {
 });
 
 QUnit.test('partner mention suggestion correct data', async function (assert) {
-    assert.expect(6);
+    assert.expect(5);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
-    });
-    const partner = messaging.models['Partner'].create({
+    const mailChannelId1 = pyEnv['mail.channel'].create({});
+    pyEnv['res.partner'].create({
         email: "demo_user@odoo.com",
-        id: 7,
         im_status: 'online',
-        name: "Demo User",
+        name: 'Demo User',
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'Partner',
-        recordLocalId: partner.localId,
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "@demo");
     assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Partner mention suggestion should be present"
-    );
-    assert.strictEqual(
-        document.querySelectorAll(`.o_PartnerImStatusIcon`).length,
-        1,
+        document.querySelector('.o_ComposerSuggestion'),
+        '.o_PartnerImStatusIcon',
         "Partner's im_status should be displayed"
     );
     assert.containsOnce(
@@ -72,7 +64,7 @@ QUnit.test('partner mention suggestion correct data', async function (assert) {
         "Partner's name should be present"
     );
     assert.strictEqual(
-        document.querySelector(`.o_ComposerSuggestion_part1`).textContent,
+        document.querySelector('.o_ComposerSuggestion_part1').textContent,
         "Demo User",
         "Partner's name should be displayed"
     );
@@ -82,38 +74,32 @@ QUnit.test('partner mention suggestion correct data', async function (assert) {
         "Partner's email should be present"
     );
     assert.strictEqual(
-        document.querySelector(`.o_ComposerSuggestion_part2`).textContent,
+        document.querySelector('.o_ComposerSuggestion_part2').textContent,
         "(demo_user@odoo.com)",
         "Partner's email should be displayed"
     );
 });
 
 QUnit.test('partner mention suggestion active', async function (assert) {
-    assert.expect(2);
+    assert.expect(1);
 
     const pyEnv = await startServer();
-    const mailChannelId1 = pyEnv['mail.channel'].create();
-    const { createComposerSuggestionComponent, messaging } = await start();
-    const thread = messaging.models['Thread'].findFromIdentifyingData({
-        id: mailChannelId1,
-        model: 'mail.channel',
-    });
-    const partner = messaging.models['Partner'].create({
-        id: 7,
+    const mailChannelId1 = pyEnv['mail.channel'].create({});
+    pyEnv['res.partner'].create({
+        email: "demo_user@odoo.com",
         im_status: 'online',
-        name: "Demo User",
+        name: 'Demo User',
     });
-    await createComposerSuggestionComponent(thread.composer, {
-        isActive: true,
-        modelName: 'Partner',
-        recordLocalId: partner.localId,
+    const { insertText, openDiscuss } = await start({
+        discuss: {
+            params: {
+                default_active_id: mailChannelId1,
+            },
+        },
+        hasDiscuss: true,
     });
-
-    assert.containsOnce(
-        document.body,
-        '.o_ComposerSuggestion',
-        "Partner mention suggestion should be displayed"
-    );
+    await openDiscuss();
+    await insertText('.o_ComposerTextInput_textarea', "@demo");
     assert.hasClass(
         document.querySelector('.o_ComposerSuggestion'),
         'active',